Working with Contact Constraints in Autodesk Nastran In-CAD

so welcome everyone to today's webinar on working with contact constraints inside order definiteness training cat my name's Matthew McKnight I'm a tech specialist with autodesk working out of the Melbourne office and I'll be running through the content today so I hope you enjoy let's I get stuck into today's session a quick look at our agenda for the morning oh sorry our upcoming webinars well this is actually the last in the series of webinars we will be holding some additional webinars potentially on a month-by-month basis and these will be looking at specific topics of interest or things that we're noticing from day to day talking to people about nice train and the questions they have so if you've got anything in particular that you'd like to see in the format of a webinar then please feel free to email me contact me in whatever forum to discuss ways of that we can bring this content to you and let's have a quick look at the agenda for today so just quickly run through as we've done the last few weeks why we use FAA and how it complements our design processes will look at contact constraints and some details we'll work through a number of examples we've got four or five to work through today and then we'll go to finish off the session with some further reference reference material and any questions that you might have if you've got any questions feel free to insert them in the question dialog box otherwise now let's get into this so why do we use FAA well more often than not it's because we're trying to understand our designs predicts behaviors or potentially even look at failure of our parts or the way they are acting and to better understand them so this is the primary reason why we're looking at FAA is to answer a lot of the typical questions that we'll have day for day inside of our design engineering manufacturing environment as we've talked about previously it's best to incorporate simulation as early into the design process as possible for a number of reasons let's have a look at those and the reasons why so as we have learnt that it's often easier it's almost easier you know across the board to assume that during the conceptualization stage we can affect the design significantly and the closer we we become to production or releasing parts to production the harder it becomes to make those those changes as a result of that the costs incurred in making changes are inverse so it's very cost effective to make changes earlier in the conceptualization stage rather than when a product is actually being released to market and if we look at the design process the majority of the costs are actually incurred during that testing phase and and and this is also leads to lost time as well so what we're trying to do is shift this lump back earlier into the process and as a result forever debt is more easily make changes understand our designs predict behaviors and then develop a better product to to ensure that that we're meeting the needs of of the market and so you know here's a snapshot of some of the typical results of that is that we get better quality parts we lower our costs not only the development cost but potentially of also the production costs of part and we can bring we can reduce that the time to develop products enabling them to us to bring them to market sooner ok so let's have a look at contact constraints which is what we're all Oh the predominant topic of today that we will be talking about a number of other things as well let's have a look at the number of there well there various different types of contacts that nest rein in CAD uses because it's it's imperative to understand these so that we can then work through and set up our um our environment properly so in the first type of contact is called a separation contact and we've got a number of on the left-hand side you can see there's three parts here and we're looking at the way that they interact with one another so the separation contact and they enables parts to move around and interact with one another it's it's called a general contact in mass trans but it's enables parts to pull away from one another or press up against one another effectively enabling them to act in much the same way as most parts do in real life further to this we then have bonded contacts or what's referred to as welded contacts in Nice Tran and this is where we're actually telling bodies faces edges and at ease that they have a bonded or welded contact with one another so they're they're physically locked to one another if one moves the other moves so there is a dependency on one another crowded in this type of contact sliding no penetration enables parts to slide so sliding no separation a label enables parts to slide but not separate from one another it's referred to as slight contact in that strand so this contact can take into account things like you know friction which is an obvious addition to this type of contact as well and then we get separation no sliding which is referred to as rough contact so where you've got parts will actually be able to pull away from one another but unable to actually slide past one another and then you get offset bonded and this is often used in an environment where you're analyzing plate structures where there might be well gaps or you might be using shell elements and because of the way the the study is setup there's gaps between shell elements enabling you to create that offset bonded contact so how do we define how do we define these contacts in the context of using nastran in cad well first of all I want to point out the fact that when you create a new study in this case it's a linear static static study that we've created we have an option here for contact data and this is where you set up the default settings for generating your automatic contacts so the type of contact that we choose going back to separation bonding bonded and likes is specified here and then we specify a tolerance and this automatically assigns context of entity so faces which are within those specified tolerance so the white of the tolerance the more entities it will capture and the more contact types it will assign further to this though you also have the ability to be able to assign contacts in both automatic and manual fashion with inside of each study so not so much as a part of the study itself but with inside of the study setup so you can we've seen there the dialog box here on the study type but you've also got the option to be able to detect automatic contacts now this is new for the 2016 release and it uses the CAD geometry to automatically detect and generate contact pairs but it's an inventor only feature so if you are a SolidWorks user recognize that this feature is only available to inventor users with inside the automatic contact contact pair generation area and this is actually there's two different types of automatic contact pairs there's the automatic which detects the the faces and the signs contacts to them but there are with inside the manual contacts another automatic contact setting that enables you to apply contact automatically and it's generated by the solver within is here you can apply a tolerance and this defines the maximum activation distance for the auto setting and the default tolerance in this is a factor related to a reference dimension of the model so it's relative to the size of your parts that you're trying to analyze which makes sense if you're trying to analyze small castings or or or molded components versus large welded structures than the tolerance adjusts to suit the geometry that you trying to analyze further to this friction can be specified as well note that and this can be for any contact pair that in using friction though convergence is harder and it cells can take longer for the this your studies to solve and so good practice is to actually first test the model without friction and then implement friction for once you have actually understand that the model has been set up correctly apply your friction and then run your analysis if we look at manual contact pair generation there is an option down here this is a manual contact pair generation is where actually specifying entities were choosing faces edges in reference to one another and assigning the type of contact and you'll note here that that there's a maximum activation distance now the distance and this is used to assign contact between elements within specific limits and it helps using this method helps limit the number of contact elements and note that when the maximum activation distance dialog box is checked but it's left blank it then uses the default value from the solver distance okay so this is the distance you've entered previously otherwise let's step into some examples and have a look at all of this stuff in practice which is probably going to help it make a lot more sense so here we are in sight of inventor and you probably saw these examples I'm going to run through a couple of examples that we used last week because they are quite relevant nice and easy to begin with and then we'll move on to some more advanced examples later on so to activate our Nastran environment just under environments click that in CAD this brings up the dialogue area as I said and typically you would move left to right across the the menu structure across the top of the screen or top to bottom through the nester and model tree our study is defined in the top section under assembly and all of our parameters are defined under the model section towards the bottom note that the model the model area is more of a library where we can set up various different parameters and then include them in various different studies that we're running in the assembly environment ok so here we have a couple of simple plates they're actually the same plate they've just been constrained together in an assembly and we want to analyze them so I'm going to step through that process I typically step through using the tree structure here because it does give access to a few additional features that aren't available across the menu such as concentrated mass damping's connectors and the likes so what we'll we'll work through this section here and hopefully everyone's seen me using a combination of them both over the last few weeks so we'll assign a new material and typical my dollar box again maybe show off on the other screen but um so the dollar box it shows up is where we can enter our mechanical properties of our part thermal properties and the likes in this case I'm just going to choose a material from our material library and in this instance I'm just going to use one of the favorites that's been previously selected and define it in the contacts context of this as a parameter with inside the model environment if Nostrum now to assign that to these bodies I need to right-click in this case a physical property say new brings up the dialog box and because I'm going to assign this material to all bodies with inside this environment I don't need to associate geometry I'm simply going to go OK and you'll find now that our physical property has been assigned inside them the analysis and we've got our material that's been assigned to that physical property let's constrain the other part so I'm going to fix it one end here and then we'll plot our load at the other end and the force is going to be minus minus 1,000 so about 100 kilograms force on the other end of the plate and go okay one additional thing and we saw this last week I'm gonna credit connector a bolted connector that will represent the joint between the two plates I'm going to choose this face here and this face here or that edge in that edge and you'll save here that we've quickly defined our bolt if we want to we can change the diameter of the bolt we can add a washer under the top and a washer under the bottom and that will specify force note that the blue and red I just indicated is showing a representation and not actually geometry that's being modeled however side the material here if we wanted to change the material we can either assign mechanical properties here specific to the bolt or we could choose any material that had previously been brought into our in materials area otherwise I'm just gonna go okay now note that I'm just going to run this by default the way that it's been set up and go okay and see what happens and we'll use this as a test case to understand a little bit more about contacts so if I just turn on the displacement plot in this instance and we'll rotate around so we're looking to the right you can see here that the parts are actually interfering with one another so what's happening here is the parts are I've got some freedom to move but they're not taking into account one another and you can see there's a small amount of penetration happening in the bottom right edge there and that's not typical of what we would expect in a real life situation so we need to look at resolving that so the way that we're going to do that is we're going to define a contact so contacts can be accessed in two areas at the top here or at the bottom and we've got surface contact here so previously there is actually been contact defined here so I'm going to delete that one actually I'll just run that again to make sure that that contact wasn't affecting the results that we got because I want to make sure that we're um we're getting a true indication of the consequences of the change so you can see it actually quite quick to run no so there was a contact that was set up but it was just floating around down in our model area it's probably been created as I was setting up study and just forgot to delete it so so you'll note here that we get the same results we get that small amount of penetration down the bottom right where the parts are starting to move into the same space as one another like we said is which is in the indicative of what we would expect so what we're going to do in this case is we're going to define a manual contact so we'll start with manual contacts and how they affect so in this case we've got a number of options for way that we can set up a manual contacts and and this is like I said before in the presentation material there's actually two ways of defining a manual contact you can have an automatically defined manual contact or you can have a truly manual contact wristers which is defined the thing about the automatic defined contact is that you can choose various different types of contact types in this case we will choose separation we can go through and assign tolerances coefficients of friction and alikes and then just hit OK and it's a generalized application of that type of contact so wherever contact is detected where these specific settings apply the contact will actually be applied if we want to specify contact throw at a specific region we can do that and in this case is what I'm going to do is just to show you how we can specify a surface-to-surface contact between say that plate and that plate I'm going to leave the maximum activation distance you can leave that turned on you can turn it off and notice that it turns to auto so they will automatically detect I can change the type in this case we want to make sure it's separation so the parts will pull away from one another go okay and I'm simply going to hit run then that's all we have to do in this case is run the geometry through the solver and wait for it to solve now this will actually take a look quite a you know in comparison to the original analysis quite a lot longer to solve because it's taking a look at all those contacts so it's looking at contact between various different elements but you can see there it's still quite quick to solve let's have a look at the results and see if it's more indicative of what we would expect and yes that makes a lot more sense so you can see here that the par is actually pulling around their take they're facing their face on face with one another so they're not penetrating into one another so you would see that this is more indicative of the type of result that we would expect from a study of this time so quick and easy setup there of our our contact time so let's have a look at this in maybe the context of a slightly different example and again it's a an example that we saw from last week but I think it's important to highlight these so I'm quickly let's step through the creation of this setup so I'm going to select a material which is from the favourites close ok so we've now got the aluminium six-oh six-one assigned in our materials area let's assign this to our parts now I'm going to do this in a slightly different way I want one body to be a solid so I'm going to choose associated geometry and assign that to this body and it's going to be assigned solid elements click on the new icon down the bottom and choose shell elements which is just it's specifying that we're going to use a shell element on a some specific geometry when associated to some a tree in this case the face of that body a sign of thickness in this instance 10 millimeters thick and then go okay so in essence we're saying we want to use shell elements on this face and the shell element is going to be a representation that's ten millimeters thick okay note that we're using the same material for both of those so they'll both be assigned the aluminium which you can see once we expand the physical properties let's constrain other parts so we'll just put a fixed constraint on the back face there let's plot a load and the trick to applying loads on shells is that you've got to choose the edge not the face so that face no longer effectively applies to the geometry so we're choosing the edge in this case we'll apply a load of maybe 1,000 Newtons in the Z direction and go okay and notice that we have a gap here so we need to take that into account so I'm going to again specify a manual contact and in this case I'm going to specify the type of contact and note because we're moving between a surface and a shell I'm going to choose the surface and the edge of the shell that we'll use and then I'm gonna choose their contact type I'm going to use an offset bonded contact and the reason being is this is going to give you a reasonably accurate representation of that gap in relation to the way we would expect it in a real life situation I'm going to turn off the maximum activation distance where I would specify what it is just have it as auto and it will automatically detect an assign based on the properties or the parameters that I've specified otherwise let's hit update all and that'll mesh the part you'll note here that we've got a solid mesh on one part and a shell mesh on the other hit run and hopefully this should only take a few minutes a few moments to to run and we can have a look at our results okay so we've got the results let's have a look at our displacement plot I'm not worried about stresses today I'm really just looking at the interaction of the contacts just to make sure that the contacts are being set up correctly another good way of determining whether your contacts are set up correctly is to actually animate your objects so once you've run an analysis animate them and look do they do they act in the way that you would expect them to so we can see here that the plate and the sorry the solid inch elements are acting and interacting in much the way that we would expect them to and so this is maybe a good indication that the type of contact that we've defined here is and it's got some reasonable accuracy associated to it okay so that so that you'll notice there that again that the key takeaway from this example is the fact that having run this analysis even though we've got maybe some weld allowance or because of shell thicknesses we might have a physical gap in our model we can take that into account quickly assign a gap but using our contacts and then run an analysis on our on our geometry okay let's go to the next example and in this example I'm not going to run through completely the analysis but we'll actually I'll just jump out of that's tran in this environment I'm just gonna set up but not run the analysis are actually you know what also here we go so let's assign some materials so I'm gonna go new and let's select some material and rather than use our favorites I'm going to choose some materials we'll choose an aluminium and we will choose another alloy maybe a six so six one and go close and go okay so what we've done is we've now brought in the two materials that we want to use with inside this study we'll assign one material to the angle line and the gusset and then we'll assign the other material to maybe the you bend and to the welds so let's do that so I'll go new and assign we'll choose the two oh and a 144 and we'll associate it to geometry and we simply then choose the geometry that we want to associate to in this case the angle and the gusset and I click new which you'll keep the dialog box open for us enabling us to then switch over to the other aluminium type that we've selected and then choose the various entities that we want to incorporate I'm going to choose the weld and the u rod and then go okay so you'll see up here that we've assigned those two materials let's add some constraints to our geometry so rather than a bolt of constraint I'm just going to fix these holes in place I'm going to click the new option and then I'm going to create a fixed constraint on the bottom edge here and restrict movement but only restricted in the x-axis so what I want to do is I want to allow it to rotate around this point I wanted to rotate in any degree so around x y&z I want it to be able to translate as well so translate up and across but just not out so that's the only restriction we've we've put in places to stop it from translating outwards and you can actually see the little indicators that show the direction of restraint there and go okay but let's apply a load and let's assume a load of minus 600 kilos or there abouts and go okay we've just applied that to the top face value hook and finally what I'm going to do is I'm going to use automatic contacts so up here we said before this is a feature with inside of inventor and was new to the 2016 release is the ability to be able to automatically assign contacts so if I click on that you'll see that it runs off and it then defines a whole bunch of contacts based on the parameters of the geometry in this case it'll be the geometry that's face on face touching now the good thing is that is that that all of these have been defined and they've all been defined with the default of a bonded contact you can see Thea that the faces have been specified and we can go in and modify any of any of these individually in reference to one another so if maybe this wasn't supposed to be a bonded contact and was actually supposed to be a separation we could go and change that here and change activation distance and the likes add friction if we wanted to the only thing that I really want to be able to that the only thing that I really want to do here is just to suppress two of those contacts that have been defined because the world is retaining the gusset plate to the hang line and we've we've actually picked up two faces that don't that aren't bonded to get to to one another so I'm just gonna suppress this face and this face here so in essence what it's doing is it's taking the face it's on the underside of the gusset which had previously been bonded to the top face of that angle line and we're just suppressing those so that they'll effectively have no contact defined for them if we really wanted to in this case you could leave them unsuppressed and then just change the type to separation which would mean that they would actually be able to pull away from one another like they were in real life but not penetrate through one another again like I would in real life but in this case you know we can just quite clearly suppress them I'm not so concerned in this case I'm just using this is an example to set up the automatic contact constraints another thing that I'll do is show you the because we haven't really talked about mesh settings previously all in all that much detail if you click on the mesh dialog box it brings up the fault dialogue area where we can adjust the element size turn on it or off continuous meshing and the likes and that changed the order of the element type but what I want to do is go into the mesh table and have a look in the mesh table has been brought up over here so the mesh table then gives us the ability to be able to easily and quickly and manipulate mesh settings for a whole bunch of different parts you know this is a reasonably small assembly so it's some quite quick and easier for us to make changes but if you've got 20 30 50 100 or more parts then making changes is critical and the time associated with it and this is where we can quickly and easily go in and modify our settings so if I wanted to I can come in here and select to make modifications on all parts go in an assign maybe a three and a half mil mesh size and you'll see that that's been migrated across all of the components or parts with inside this assembly if I deselect that now and then go and modify just say the welds in isolation I can just modify one well out one mesh side size without altering all of the others note in this case I'm going to turn off a continuous meshing which means that the nodes which sometimes where you've got contacts set up can actually become bonded and tied to one another so I'm just going to turn off the continuous meshing option here if I then select all of the elements or components and hit update you'll see you'll see that it meshes those in the background for us so we can use this as a diagnostic tool so if we're having problems with parts that aren't meshing and we can quite quickly come in here isolate the ones that are or aren't causing us problems and then go in and modify those in isolation from the other ones making it very a very efficient method of using this mesh mesh generation tool once we've defined that though it's then just a simple matter of hitting run we've set up our mesh we've set up all of our parameters we've assigned loads and constraints and and our contacts have been defined quite quickly for us and you saw there that we defined effectively around eight to ten contacts in a few seconds and it's quite easy for us to distinguish you know those from one from another because they're highlighting often the various different contacts visually on the screen for us so I will give this a moment to run and then we'll have a quick look at the results um that we're seeing from the study so if anyone's got any questions again this is just a quick reminder and don't forget that you can enter them if we've got time at the end of the session I'll answer them otherwise all I'm trying to make sure that I get back to everyone after the session with any answers that they might be looking for so let's have a quick look again I'm just going to display the displacement plot and have a look and understanding of this yep it looks like it's working the way we would want it to I'm often working inside the Edit environment with inside the results it gives you a little bit more control over the think the information that's shown so I can go in here and turn off things like element edges all of our wire loads and constrain indicators and the likes and then display the the the information makes a little bit more ease easier to to decipher I can also switch between various different types of studies so I don't have to go outside this environment to then go and access a say a stress plot I can quite quickly then switch over to a von mises stress plot and have a look at what the stress is in my design I can even switch over maybe to a safety factor of plot which is something we haven't actually shown today but you can quickly turn on a safety factor plot the good thing is you can obviously go inside of these and turn on max means I can adjust the number of contour bands that I'm showing so there's 24 different graduations in and we've now reduced that to 10 down here by simply going into this section here and I can turn on the maximum a minimum as well so if I wanted to make sure that I had a minimum of say 3 is my factor of safety and I can go in and make sure that I've got a 3 let's segregate out anything out that's over 10 and go ok and you'll see now that we've got a clear indication of those areas where there is some concern and you'll note that using the probe tool that there's the wide areas here actually indicating areas of our design that are under the the factor of safety for the part so factor of safety in this case is going to define by the you know things like the yield stress of the material okay so we've quickly set up that study so let's move on we're going through time fairly quickly got another 10 minutes each left which will run through two additional types and I want to introduce some some more functionality to you so we've got this little joint that's been defined and you'll note that the parts actually been split down the center of it and the reason being is because the part is actually symmetrical about that plane it's not symmetrical top to bottom because there is actually a washer on one side or a nut and a bolt but effectively through the center plane that's been split about it is a mirror from one side to the other so the good thing is that we can take advantage of this and it means that we can run analysis and get results that are indicative of that if we would run it using you know a complete assembly or complete components but in a fraction of the time so we're actually reducing the time that it takes to run these types of analyses again let's let's step through and set up this study so in this case I'm going to select the material something that I haven't touched on before is if you go load database and actually by default it'll go through to a folder with inside your program program folders area and there isn't any I materials file there if you activate that file you'll note there's a whole bunch of materials that are available to you to use these have been set up by the the nest Tran team as part of the development of the product so you'll find that there's a whole bunch of different types of what looked to be steel predominantly steel material properties there's a whole bunch of these that have been assigned to this library so I'm going to choose one of them in this case mostly define a couple of different materials and we'll select another one from that same database let's choose a stainless steel and go okay so we've now got a carbon steel and a stainless steel let's assign these to the model so on the physical properties area I'm just going to go new and then select the geometry that I want to associate to I'm gonna just choose associated geometry I'm gonna choose this and that so we'll make those two components out of the carbon steel let's click new and associate the stainless steel to bolt and nut and go okay so we've assigned these material properties let's add some constraints so in this case and add a constraint which is here and we'll add it a load again which is at the other end so it'll be a sort of a torsional load but it's actually causing here on the bolt and we'll apply what load will we put on this one let's make it a two hundred kilos or there abouts it needs to be the opposite direction so I'll put a negative in front of it okay what else do we need to do we need to define contacts so I'm going to use the automatic contact generation just go okay and you'll see here that it's it's found a number of different contact type so we've got various different contacts that have been defined now like we saw before these are all going to be assigned the default contact type in which case it's going to be a bonded contact well what we want to do in this case is we want to enable all of those components to rotate and move in relation to one another even separate away from one another but just not penetrate one another so what we can do is change these to be a separation contact so I'm going to quickly go through and modify the types to separation on these quickly fortunately there's no way of than no way that I know of defining them if they've been defined in this fashion in the one process so and the last one okay so the only contact that we've got a bonded contact years between the bolt and the nut to assume that they're locked in relation to one another everything else has got a separation contact enabling them to rotate and move away or in relation to one another okay so and the final thing we need to do is add a one further constraint and this is a symmetry constraint and I'm going to you'll notice down here that with up until now we've been predominantly using a lot of our constraints fixed end and you know and some customization of the types of constraints in this case I want to apply a symmetry constraint that's going to effectively tell nester and that about that plane we have some geometry that's symmetrical so I've chosen all of the faces that have been split I'm just going to assign X symmetry and you'll see it defines now a set of contact constraints that that will represent a symmetrical constraint for that geometry note the one thing that I will note that I didn't mention before is that when we assign our load L low we'll be a factor of the symmetry so if we've halved our part then we want a half-hour load so in this case a true load might actually be 4,000 Newtons but because we're only using half the geometry half the material then we actually only assign half that load otherwise we can just hit run I'm going to use the default mesh settings and see what happens hopefully this shouldn't take more than a moment or two to run before we get a result take the opportunity to grab a quick drink so there we go so it was only a few seconds let's have a look at the final result and again I'm just using a a displacement plot it looks it's very hard to decipher because there's a lot of information that's going on here so what I'm going to do is change edit the plot I'm gonna hide some of the information that's being shown and then display that again so that we can better see what's going on and understand whether we're getting a true representation of our parts so you'll see here that we're getting a true representation notice though there's a couple of areas where we're getting sticking nodes that are sticking on our geometry so this comes back to something that I spoke of before if you're noticing that it's because of a setting inside of your mesh settings where you've got continuous mesh turned on what I'm gonna do is change their mesh size as well so we'll the just it will make it a little bit finer so we can see a little bit more detail of what's happening maybe we'll be concerned because there's not enough elements through the thickness of material like I said turn off continuous meshing we'll hit update that'll update mesh geometry you'll see that happening actually in real time in the background okay okay and then again we'll quickly run that and see the result of making those small changes to our set up here and the consequences of it warnings that you see there I wouldn't be so concerned about them we talked about this in one of the earlier sessions about a mesh and how they how do you know whether you've got a good quality mesh we will be putting together a webinar hopefully in the next month or two it'll talk somewhat about various different types of warning messages that you can get and also the error messages so that you can help help you problem solve some of the issues that you might encounter when you're setting up and running your models okay so we're just finishing up and there it goes and let's have a quick look at our displacement results again as a comparison or edit them display and note now that not only are we getting a little bit more detail because our mesh has been refined but those instances where we were getting some elements that were effectively tying themselves to adjacent elements have gone completely so if you are seeing that then that's a good indicator that you've got you need to go in and adjust your mesh settings so otherwise like I said you know you can another good thing to do is to animate your results to see visually whether you're whether they're reacting and or acting and reacting in the ways that you would expect them to generally this doesn't take much to run an animation but you actually can access quite a lot of information from it you can see here how the components are acting in relation to one another and and that looks to have set up quite well so again looked as though we've done the right thing they're just going to turn the animation off and finish that one and then move on to our last example okay so here we are now straight in CAD environment again let's quickly assign some materials I would choose we chose an aluminum choose a steel okay with sine those steel is going to be going to a pin aluminium to the handle supply a load that face directions give me in the z-direction order five okay let's add like we said before a constraint couple of constraints will add pin constraints to either end of our pin we're going to add a symmetry constraint with the in face of our part so there's our two constraints let's define a connector we undefined - a rigidbody one between here and the edge and then another between here and that edge let's pick up our contact we'll define a manual contact surface the surface is going to be that surface on that surface we're gonna have an automatically detect separation not bonded okay here's our surface contact that's been defined and let's hit let's maybe change our mesh size Oh we'll just leave it to enough continuous you know Tate will have a quick look at it see what it looks like yeah doesn't look too bad let's hit run and give it a few moments and see what comes in far of this so what we would expect is we've effectively got this handle is almost free to move because the only constraint will fix the constraint that we have is on the pin so the pin can't move either end it'll be able to lift up which is what we would expect and there's the handle lifts effectively there's nothing tying a handle to the pin other than the contact constraint so we should be expecting some pretty funky things going on between the contacts in this case to simulate the interaction between the two parts we're a few minutes out so let me just again any questions you might have shoot them through otherwise this should only take a few more moments hopefully two to finish up before we can have a quick look at it I might show you waltz that's doing talk about some further reading that you can be doing in your spare time so if you're after some more information about an australian cad the forums the autodesk forums full of information reference material that's uploaded by a lot of technical specialists and support personnel but also from users that are using the product answering are asking and answering questions between one another that's also a good area where you can submit your ideas for ways to to improve the products as well using what's called idea station beyond that there's regular updates from the simulation team on twitter you'll also find that the seem you excuse me the simulation team are updating on facebook regularly information that's relative to Nestor and related products and there's often information that's being uploaded to the Autodesk simulation YouTube channel as well beyond that we also have a local future of making things a group on inside of LinkedIn so please join that group there's a lot of interesting information that's posted up there that's relative just to to manufacturing and predominantly manufacturing in a local area and then obviously if you have any questions then feel free to contact me directly my details are up on the screen I'm more than happy to answer your emails and calls as required otherwise I did hear a nice train finish up so let's have a quick look at it and have a look at reaction that we're getting and you can see here that it looks like it's doing what we were expected to again let's go inside of our edit environment where we can turn off I hate things that we don't need to see let's display our displacement plot here have a look at the reaction of our part and like I said sometimes animating geometry can give us a really good insight into how our parts are reacting and help us problem-solve if though we think that the part has been set up correctly or incorrectly so you can see there that we've actually got a very stiff pin the pins actually not moving much at all our part is actually deflecting quite a bit and that's sliding along the pin there so you can see that we're getting a reasonable amount of interaction along the lines of what we would expect if we wanted to we can quite quickly say turn on our stress plot and have a look at the stress through the parts and understand what's going on in this case the other thing to note as well you can get reaction forces as well so so contact forces as well so if we wanted to we can go and turn on our contact forces and look at the forces that were actually getting back on our pin and through our geometry so this gives us an understanding of the interaction at the interface of what's happening in those areas as well otherwise again I'll just switch back to the end of our present presentation we actually have run out of time we're back on 12 o'clock which is good timing I thank you all for your attendance I wish you all a good day and hopefully we'll see you at another nest ran or Autodesk related webinar in the near future thank you

Channel: Autodesk ANZ

Views: 11,188

Keywords: autodesk nastran in-cad, inventor simulation, finite element analysis, fea connectors, autodesk simulation

Id: EolvIEb7rGo

Length: 51min 43sec (3103 seconds)

Published: Sat Oct 31 2015