Journal Published Online: 01 September 1984
Volume 12, Issue 5

Determination of Fracture Toughness Under Quasi-Static and Dynamic Loading Conditions Using Wedge Loaded Specimens



A study of the variation of fracture toughness of American Iron and Steel Institute (AISI) 1045 (Unified Numbering System [UNS] G10450) steel in the annealed condition, which exhibits elastic-plastic behavior at the crack tip, with loading rates ranging from quasi-static to dynamic conditions was undertaken. A wedge loaded compact tension (WLCT) specimen geometry was used in both testing conditions. The onset of crack propagation was detected using a strain gage mounted near the crack tip. The fracture parameter JIc decreases by about 50% when the loading rate ˙KI increases from 0.5 to about 106 MPa · m½ s−1. The measured values of JIc using WLCT specimens were confirmed from previous data on this material using standardized three-point bending specimens as well as from evaluation of JIc from stretch zone width measurements using scanning electron microscopy of the fracture surface of the WLCT specimens.

Author Information

Bayoumi, MR
University of Manitoba, Winnipeg, Manitoba, Canada
Klepaczko, JR
Institute of Fundamental Technological Research, Polish Academy of Sciences, Warsaw, Poland
Nabil Bassim, M
University of Manitoba, Winnipeg, Manitoba, Canada
Pages: 8
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Stock #: JTE10732J
ISSN: 0090-3973
DOI: 10.1520/JTE10732J