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Hello everybody, I'm not entirely new to FEA analysis but I'm struggling with Optistruct at the moment. I have a Formula Student Monocoque which I am trying to optimize to work with unidirectional carbon. I'm trying to create an optimum lay-up that's as light a possible while being as stiff aswell. I followed the guide "tutorial composite optimization with optistruct 11.0 on the example of a formula student monocoque" to the letter but somehow the Optistruct Optimization creates almost 1300 plies... Which is is impossible to manually adjust the zones... Could somebody have a clue what's going on here? Maybe I'm doing something wrong in the OptiStruct settings? I should have only 4 plies per original ply on default... Thank you in advance! I attached the model file. Regards Alexander monocoque_18-04-16_ADB_Opti.hm
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