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  1. VincentDillen

    Modeling hyperelasticity using Mooney-Rivlin strain energy density function

    Hi All, I'm trying to model a hyper elastic material using the following equation, which is a simplified version of Mooney-Rivlin strain energy density function: W=c(I-3) But the problem is that when I am differentiating W with respect to E to obtain the components of my tensor, E disappears...
  2. VincentDillen

    Converting NAS file into STL, OB or ...

    Dear all, I have a 3D model created in NASTRAN. The file extension is .nas . I need to import this model into another software (not a kind of FEM packages) for further processing. It suppports OBJ, STL and some other formats but not nas. Now I need to convert this file (mesh) into anyother...

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