Abstract
In this study, the proposed elastic-plastic fracture toughness test procedure based on Top-on and End-on ultrasonic methods was applied to JIc tests for the C-shaped specimen, and it was pointed out that the load and load point displacement at the onset of stable crack growth during fracture toughness loading can be detected from a single specimen by the End-on ultrasonic method. JIc, measurements obtained for the C-shaped specimen were in excellent agreement with that obtained for the compact specimen. The JIc value evaluated according to the proposed JIc test procedure was also in agreement with that determined according to the SZ method, but was not consistent with that determined according to the R-curve method.
