Proper

Abstract

In machines and mechanical structures, the deformation and fracture due to external forces occurs quite frequently. While the occurrence of fracture at a stress even lower than yield strength can be confirmed in some cases, such deformation and fracture of mechanical structures occur inside the material or is generated by cracks, which causes the stress concentration in not only existing materials but also new materials eventually inducing the deformation and fracture of mechanical structures even in low stress environments. Based on this state, this study was investigated with notched tensile specimen on the durability and strength characteristics of a material with cracks and defects, and this study was performed by 3D design of notched tensile specimens of heterogeneous material having cracks inside with holes. Through the results of this study, the durability and strength characteristics of each tensile specimen model of heterogeneous material could be investigated, and these results as the basic study data on materials having defects along with cracks inside can be applied to the design of mechanical structures.