Evaluation on elastic-plastic fracture resistance curve of SA508C-3 and aluminum alloy steels by load-ratio method

J. Ocean Eng. Technol. 1996;10(2):98-105.

Yoon H. K.

Load-ratio 법에 의한 SA508C-3와 알루미늄 합금의 탄소성 파괴저항 곡선평가

윤한기,차귀준

동의대학교 기계설계학과,동의대학교 기계설계학과,동의대학교 기계설계학과

Keywords: Load-ratio method, Unloading compliance method, Elastic-plastic fracture resistance curve, Normalized load displacement curve, Rotation hinge model

Abstract

A method is proposed to evaluate the elastic-plastic fracture resistance curve only with load displacement records without the crack length measurement in CT specimen. This method is based on the idea that the effect of plastic deformation and the crack growth can be measured only by using a load-displacement record. If we know the reference-load curve representing the hardening of specimen, then the crack extension can be calculated by the elastic compliance determined from the load ratio. The results of this proposed method were compared to those of the elastic-plastic fracture resistance curve for the ASTM standard unloading compliance method. The experimental results for two kinds of ductile materials showed that the proposed method well simulates the material J-R curves. This method is currently applied for CT specimens. but it can be extended to the other specimen geometries.