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effective strain after deformation

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hongfengtltl

hongfengtltl

Materials
Joined
Sep 16, 2011
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I just learn the finite element theory, now I have one problem, I want to calculate the four-node effective strain after deformation (you can see the attachment) using four-node isoparametric element and Lagrangian finite deformation theory. I want to learn the relevant theory, could you please give me the detailed calculation process? Thank you.
 
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