Hi Vincenzo,

Could you please provide more information about the model, such as the input hardening (stress-strain) curve used for plasticity, as well as contours of plastic strain at the time of element distortion? Also, does the material withstand 100 mm of deformation in the actual tensile test in the lab?

As a general suggestion, imposing velocity-based boundary conditions is preferred over displacement-based boundary conditions for dogbone tensile simulations.