Effect of Notch on Tensile Fracture Behavior of Different Plastic Metal Materials

Three kinds of metal materials with different plasticity of 10CrNi3MoV steel, 5083 aluminum alloy and 500-7 nodular cast iron were used as the research objects, and the smooth and notched specimens were processed respectively. The effect of notch on the fracture behavior of the metals with different plasticity was studied by comparing the tensile property and fracture morphology of specimen. The results show that the notch changed the stress state of material, reduced the deformation in the shear direction and improved the proportion of normal tensile fracture. For plastic materials, the notch root could alleviate the stress concentration through plastic deformation, and the larger the notch depth, the better the plasticity of material and the higher the tensile strength. For brittle materials, the stress concentration on the notch root would lead to the premature fracture of specimen during the tensile process and reduce the tensile strength of materials.