SYMPOSIA PAPER Published: 24 August 2020

Single Specimen -Based Fracture Toughness Test for High-Strength Steels


A single specimen J-based fracture toughness test has been developed which results in accurate and reliable measurements for a high-strength low-alloy steel with several yield strengths. The specimen used is a deeply cracked Charpy specimen tested in slow, three-point bending. A simple plastic-stress analysis was performed which identifies a single point on the load displacement trace at which the J-integral is calculated as an estimate of KIc, The method can be applied inexpensively and may be used as a quality control measure of fracture toughness.

Author Information

Kapp, J., A.
U.S. Army Benet Weapons Laboratory, Watervliet, N.Y., US
Underwood, J., H.
U.S. Army Benet Weapons Laboratory, Watervliet, N.Y., US
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Developed by Committee: E08
Pages: 402–414
DOI: 10.1520/STP791B1983024
ISBN-EB: 978-0-8031-7720-8
ISBN-13: 978-0-8031-0729-8