Fatmac

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Fatmac
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  • thats an interesting approach -i'll give that a go - thanks for that
    in spiky mesh after calculation. Comment by Fatmac October 21
  • 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…
    in spiky mesh after calculation. Comment by Fatmac October 18
  • 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…
    in spiky mesh after calculation. Comment by Fatmac October 18
  • 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…
    in TIE CONNECTIONS AND SHELL SURFACES Comment by Fatmac September 25
  • 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??
    in Am one know how to deal with this? error in node list. Note updating node numbers Comment by Fatmac September 3
  • 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…
    in How to use OpenRadioss Comment by Fatmac September 1
  • 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…
    in How to use OpenRadioss Comment by Fatmac September 1
  • 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
    in Hint about .step file preparation Comment by Fatmac July 8
  • 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 …
    in Truss Thermal Expansion Comment by Fatmac July 5
  • video of out put
    in Will not solve quasi-static Comment by Fatmac June 22
  • 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
    in Will not solve quasi-static Comment by Fatmac June 21
  • 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…
    in location dependant force Comment by Fatmac March 28
  • understood -thanks again for a quick reply
    in Temp issue when used with contacts Comment by Fatmac February 28
  • 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…
    in Defining shell properties in MW internal analysis Comment by Fatmac February 28
  • 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.
    in Nonlinear SpringA Comment by Fatmac February 16
  • Thanks again - it is all slowly becoming a little clearer!
    in Plastic deformation Comment by Fatmac February 16
  • 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 …
    in Plastic deformation Comment by Fatmac February 8
  • 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!
    in Plastic deformation Comment by Fatmac February 3
  • I 4got to add that sometimes u get better structured meshes (certianly in gmesh) if u partition the piece into 3 and 4 sided sections - slice them in ur CAD program and re-join them b4 exporting. then try these gmesh comands then i get something …
    in Structured mesh Comment by Fatmac February 3
  • within MW u can use customised comands for gmsh - paste the following into the "custom Gmesh commands" in meshing parameters and u will get a reasonable 2d mesh Mesh.Algorithm = 11; Mesh.ElementOrder = 2; Mesh.RecombinationAlgorithm = 3; Mesh.Reco…
    in Structured mesh Comment by Fatmac February 3
  • Rhino has a great function called quadremesh -for 2d meshes like this it works nicely
    in Structured mesh Comment by Fatmac February 3
  • thank you disla for looking at this - i had a little play with this and managed to get more sense out of it by swapping the contact surfaces as u suggested. I'm afraid some of the other suggestions u made were beyond my level of understanding. "Proj…
    in Sheave and rope Comment by Fatmac December 2023
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