抄録
Inclusion causes an accidents. Structures have inclusions, which cause stress in Abstract material. Crack occur in the material due to high stress concentration. Cracks is developing gradually, which can cause the structure to be destroyed. It have study by calculation found about inclusions. But, study by experiment can't be found. This study explained problem in the tensile load. Test specimen models prescribed by a japanese industry standard was used in photoelastic method. Elliptic inclusion is in center of test specimen models. This study used test specimen models made by a numerically controled machine tool. Test specimen models is high precision. Test specimen models has annealing given after cutting by electric furnace. This study used photoelastic method, method of caustics and finite element method.
