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J3 derivative option 3

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Derivative of an expression

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Hello iMechanica!

While reading a paper, I've tried to repeat a derivation of a simple tensorial expression given in the paper and my result differs from the result in the paper. Could you please look in to the PDF-File (just 1 page long!) that I have attached to my post and see if I derived everything right? That would be great!

 Thanks a lot in advance!



Derivative of Logarithmic Strain

Some of you probably work on problems that involve moderately large strains. An useful strain measure for such problems in the logarithmic or Hencky strain. In particular, if you deal with the numerics of large strain simulations, you will often need to compute the material time derivatives of logarithmic strains.

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