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characteristic Length



is there a way to get the characteristic length of one element? I wanna calculate xult (when the element is cracked, fracutred..). 

 I use the concrete damage plasticity model and after reaching the tensile strength i assume a linear softening with fracture energy.


Input are:

   Young´s modulus

   max. tensile strength

   fracture energy



   when do i reach xult or what is the plastic strain equivalent

Mesh generation

I have a big problem with meshing.



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