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Found 3 results

  1. Hi, I need help with this model. I would like to perform a non-linear analysis on a composite specimen. It's a sandwich panel with honeycomb core, modeled as mat9 ort with two plies of carbon fiber per side. The main issue is the contact between the punch and the panel, the same as the one with supports. I'm not able to model them correctly. I've thought to use the contact slide but the results does not have sense. I have compared this with real test and the reaction force on the punch is more than 12 times bigger than reality. Looking at the results plot, It's clear that contacts behavior is not acceptable. Can you please help me? I attach here the .hm file. Thank you!
  2. Hi guys, I am currently trying to solve a problem with my 3 point bending setup. I designed a hybrid composite structure with 3D elemtents as core and 2D elems as Laminate. To apply the load I have modelled a 2D Impactor which moves down and translates the forces into the laminate via contacts. (MORIENT: Norm, S2S, TRACK: finite) Everything works fine exept my results... if I view the contact forces Optistruct would give me the result as shown in the picture. Has anyone had this problem before? I have already tried using CNTSTB and defining the SRCHDIS. Changing Master and Slave or N2S and S2S did not help either. At some values the two lines of contact forces would move closer to each other but never close enough. Greetings from Germany Lars
  3. Hi, I have some questions I was hoping someone could answer. I am trying to model a sandwhich structure with carbon fibre skins and aluminium honeycomb core and then perform a 3 point bending test in the software if possible. 1. Could someone please explain what the reason is for selecting PCOMPP, PSOLID etc, what are the reasons for choosing one of them over another? 2. Which compersite property: PCOMPP, PSOLID, PSHELL, etc, do I need to select for the task I want to achieve (3-point bending simulation)? 3. Another question relates to my understanding of the MAT 8 card....would I be correct in saying that as MAT8 only asks for the in-plane properties, it would not be possible to get proper results for a 3-point bending test in the software? (Or does the software still work this out?) 4. Would I need to use the MAT9 card for what I am trying to do and in that case what composite property do I select, PCOMPP, PSOLID, PSHELL, etc? 4. If I select for example PCOMPP for the honeycomb properties, do I have to select PCOMPP for the carbon fibre skin properties? Regards
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