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Fatmac
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Comments
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Understood, I was using solid elements for that one. I just saw the example and couldn't help but give it a try! Thanks for pointing it out though
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I have stumbled across an excellent collection of bench marks generated by Andrea Starnini - see screen shoot attached. I have really enjoyed going thru some of these examples and wonder if other documents like this are available? Having work thru …
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I had a little play with ur model -I changed a few things and added far more complexity than needed, but it may give u some ideas how to deal with some of the issues u are likely to come up against. I did make an attempt with tension only elements, …
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nice project. I've spent (wasted?) many hours modelling masts and trial and error has lead me to the following conclusions. My comments are not some much based on science - rather making many errors and looking for work arounds! -start simple, make …
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Thank u Victor for comments and serio for the example files -i think I have set up the cyclic symmetry correctly as my model runs ok and gives expected results in static linear and non linear runs until I start playing around with contacts then i …
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thank you for looking at that. It certainly solves nice and easily in that wedge with the frictionless supports. I'm keen to master the cyclic symmetry so I'm really interested to know why when i take this model and try and apply cyclic symmetry it …
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thank you Sergio for pointing that out -certainly something to watch out for when when revolving surfaces when one edge is on the axis or rotation. I've had very little experience with wedges - do they generally behave behave ok - even if they have …
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Hi Franc -when I open up the file u attached i see the ball and box as 2 separate components which then allows u to assign a new material to each. If they are collected as one component then isolate one mesh and in the 3d window left click and selec…
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Thank u again Victor. That all makes sense. For most of my applications I think I like the 6 weak springs connected to a part that will be sort of moving with the free body rather than being connected to earth which is what I understand the elastic …
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I have striped down the model i was using. It had contact and 2 beams in it -I simplified it to one beam and a simple load. The difference between mode 1 when 1 mode is asked for and when 3 mode is asked for is now only decimal places so perhaps it …
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I tried with and with out the C3D8R elements so i could compare with the internal solver and i still get the same affects when I select only 1 mode. I have mixed precsion switched off. I have tried switching solver with the key words but I get the f…
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I some times check my model by saving the mecway file as a .stl file (file then save as) and import that in my original CAD file and compare the two
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thats an interesting approach -i'll give that a go - thanks for that
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thanks again Victor for u quick reply. I will look and compare unilateral vs bonded elastic contact and see what gives. In my, very likely, over simplistic take on it, I was focusing more on the difference being more in the ability of the unilateral…
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Hi guys - I was trying to brush up on my bolted connections and went back thru this model as a worked example. I do like this approach used here. However, one question that came out of it, what is the consensus on how best to deal with the washer, b…
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Thank you for ur input. I not had too may issues with *TIE but was put off by the red warning -I'll continue ignoring it. My battle with NL and shell elements has be long and I generally avoid them where possible! Where I have had problems I have n…
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After playing around a little, closing and opening it in MW26 all with no change, I tried opening it in MC24 -may be a coincidence the issue went away, I saved then reopened in MW26 and now appears ok again??
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its certainly challenging me - i found more infor on the web but not sure I'm making much progress at the moment - I can't even displace a node or make a time function yet! i think this is my best source of info so far https://help.altair.com/hwsol…
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Thanks for another great update. I'm particularly enjoying the addition of the openradioss solver. I'm struggling to get to grips with even the simplest boundary conditions or materials but I'm getting there and I feel it will be a very useful tool…
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Have u tried selecting the whole model once it is meshed and and then "merge near by nodes" and slowly increase the tolerance and see if it connects the nodes at the surface edges?? I
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Thank you Disla for the tip -i tried the hyperelastic details you suggested and indeed it does converge much better (see attached video). I'm unfamiliar with these types of materials and although the solution now converges I could not find a set of …
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video of out put
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i played around with the model a little- did away with the pressure and attached the film to the wire - may be not a very elegant solution but it sort of worked. Once a full wrap is on i added contact from one side of the film to the other
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thanks guys - that has given me some great ideas. I've started playing with the variation of density with temperatures. I see that temperature allows a location dependency, so I vary this with a function based on hgt (z). I then apply a custom step…
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understood -thanks again for a quick reply
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thanks for the rapid -reply. I have been looking at a model with a core laminated structure and was seeing differences when I used shell and solid laminates in CCX in buckling situations -i think it may partly due to the way I have "fixed" the end f…
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i've been using pretension sections as shroud adjusters in yacht rigging models -its a bit of a work up and I imagine it sucks up some computation time but it has appears to work and sort of self aligns also.
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Thanks again - it is all slowly becoming a little clearer!
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Its pretty clear I need to go back to school where it comes to the definitions of all the different types of stresses and strains!. My focus was more to see how the different types of plastic models work and compare against each other. Also to see …
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thanks again for all ur insight -I will take another look now I have more info about all the different types of strains there are!
