Stress triaxiality effect on damage evolution of high-strength steels

Abstract eng:
The damage evolution of three high strength steels was characterized at two levels of stress triaxiality, 0.4 and 1.2, using both smooth and short gauge tensile specimens, respectively, where the value of stress triaxiality was determined using finite element modelling. With the aid of numerical simulation, the degradation of elastic modulus for the smooth tensile specimens was first characterized by eliminating the influence of geometry on the unloading modulus measured from cyclic tensile tests. The approach was also applied to the short gauge tensile specimens to further explore the damage evolution. A theoretical model describing the dependence of damage parameter on the stress triaxiality was then used to show the difference in the damage evolution between the two types of tensile specimens.

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