Crack width and plastic strain

Hi,

How is crack width calculated in FEA NX? Which formulation? There is correlation between crack width and plastic strain?

Regards

Thanks for your patience. Here is the reply from the developer.

Step 1. Convert strain(eps) and stress(str) into crack coordinate system.

Step 2. Calculate crack strain eps_cr which does not include elastic strain.

            eps_cr(i) = eps_nst(i)-sig_nst(i)/E

           where, i = 1, 2 for two dimensional

           i = 1, 2, 3 for three dimensional

Step 3. Calculate crack width, cwitdh.

            cwidth(i) = eps_cr(i)*char_len

            where, char_len is the characteristic length of the element

           i = nn, ns, nt.

Regards,
DK Lee
Technical Manager

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