On the Equivalent Thickness of a Side-Grooved Specimen

抄録

Fracture toughness tests of side-grooved specimens were carried out to investigate the equivalent thickness of a side-grooved specimen. The effects of a side groove on the stretched zone width and stable crack growth were also investigated. From the results, the equivalent thickness for the J_IC value was in a range between B_e1(=√(B·B<SUB)N>) and B_e2(=B-(B-B_N)²/B). Although the thickness B_e2 can be utilized from the viewpnint of a conservative estimation, it is reasonable to use the thickness B_e1 which also gives good estimations for the blunting line.