Nowadays I am modeling a elastomer bumper, the model has hyperelastic properties by marlow model. With the aim to reach an approximate response to reality , I have decided incorporating a damage model for elastomers (mullin effect). According to Abaqus procedures I need experimental datas (load-unload-reload). The problem is that I just have load-unload datas in (Newton-milimeters). The doubt is how to specify mullin effects in the model. How to calculate r, m and beta variables???