Introduction of new state of stress and defining a failure criterion for isotropic ductilematerials

In this paper a new biaxial state of stress is introducedand using the strain energy theory and the new state ofstress, a failure criterion for isotropic ductile materials isdefined. Then, the prior experimental data, which areobtained from the references, are expressed in terms ofthe new defined state of stress. The new failure criterionis compared with the modified experimental data whichshows the good precision of new failure criterion. Also,some relations are derived to calculate the magnitude ofmaximum resistible stress by a certain member in aspecific direction and the optimum value and sign of thestress in the other direction.

کلیدواژه ها:

Failure criterion ، Ductile material ، State ofstress