SYMPOSIA PAPER Published: 01 January 1986

A Single Specimen Determination of Elastic-Plastic Fracture Resistance by Ultrasonic Method


A single specimen ultrasonic determination procedure of the empirical measure of elastic-plastic fracture resistance under monotonic and multiple unloading conditions was proposed. It was shown that the elastic-plastic fracture toughness JIc and the tearing moduli TJamax) calculated from the slope of the determined Jamax curves are independent of specimen size and side groove depth. It was also found that the advancing crack tip opening displacement δa is nearly constant during the stable crack growth. The multiple unloading R-curve was successfully determined and corresponded to the monotonic R-curve. In addition, the transition behavior from low cycle fatigue to monotonie stable crack growth characteristics was experimentally clarified.

Author Information

Hirano, K
Mechanical Engineering Laboratory, Agency of Industrial Science and Technology, MITI, Ibaraki-ken, Japan
Kobayashi, H
Tokyo Institute of Technology, Tokyo, Japan
Nakazawa, H
University of Chiba, Chiba-shi, Japan
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Developed by Committee: E08
Pages: 415–434
DOI: 10.1520/STP17410S
ISBN-EB: 978-0-8031-4972-4
ISBN-13: 978-0-8031-0472-3