Learning Forum

[canoztrk]

Hello everyone!

I am simulating a structure with a shock of 40g shock wave for a given time like 11 ms.

Firstly when i encountered with this project I've used modal+transient(Mode superposition) and our customer responded our report with  "

Material data is unsufficient for shock analyses since only the linear elastic material properties are used. Nonlinear material parameters must be handled for these type analyses. "

So my question is what type of material data that I need and is it really differenciate results between nonlinear transient and modesuper position transient analysis? (I'm questioning I read equ. stress with MSUP is 0,5 Mpa but if i perform nonlinear transient would I see like 100 Mpa??) btw my model contains composite material too.

[Ankush Choudhary]

Hi,

Modal + transient can only handle linear analysis. If your material has any nonlinearity, such as elastoplastic or hyperelastic, then run your analysis only in transient.

Thanks,

Ankush

[canoztrk]

Thank you for responding but as ı explained my question was how did customer decided material data unsufficient without nonlinear material data? my materials glass,aluminum,acrylic.At the end of MSUP analysis I got 0.1 Mpa stress so ıt's nothing so do ı really need to do transient analysis? with these results ı suppose ı wont see any non linearity?