The tensile tests are conducted and the void shape is measured on ductile fracture surface by changing the notch radius of tensile test specimens

which is made by the SiC reinforced metal matrix composite material. The effect of void configuration and coalescence under the different stresstriaxiality condition is analyzed. These experimental results could be used to simulate ductile damage correctly in the process of the metal matrix material and machine elements under the multidimensional loads

and propose a reasonable strength evaluation method and scientific basis for estimating the ductile damage mechanism.