I did not test ductile damage because concrete is a cuasi-brittle material. Nevertheless, the problem is basically solved in the way i described in my previous post & the attached file. Thanks for your help!
Mohammad,
Of course, Damage function definition was wrong in the previous inp file. I defined D function correctly as D=1-K/Ko, where Ko is the initial stiffness (corresponding to no gamage), and K is the actual stiffness, calculated as K=sigma/w ( sigma and w from the softening curve). It was...
Mohammad,
Thanks for you answer. Find below a simple one-element model with a 3-point "D" function tabular definition. After analysis, P-displacement do not recovery a bilinear response at all, but a couple of parabollas, both centered with each linear branch, looking like integrals of input...
Modelling a 3-point test of a concrete beam, i used 4-node cohesive elements. I began with a linear and exponential softening functions, and everything was ok. But concrete in tension actually has a bilinear softening, so i tried to use tabular softening definition, by entering the damage...
