Abstract
A ductile fracture locus formulated in the space of the equivalent plastic strain to fracture and the stress triaxiality for the polypropylene (PP) blended with ethylene-propylene (EPR) and talc fillers is obtained at the intermediate strain rate by using a combined experimental-numerical approach. Biaxial loading tests on the flat butterfly specimens are carried out to characterize fracture behaviors under pure shear, combined shear and tension, pure tensile loading conditions at various loading velocities. Corresponding fmite element analysis is performed to determine the evolution of stress, strain and strain rate states. It is found that the material ductility strongly depends on the stress triaxiality for the present PP/EPR/talc blend. The obtained fracture locus covers a wide range of the stress triaxiality. It would be applicable to the fracture analysis of real automotive components under various impact loading conditions.
