SYMPOSIA PAPER Published: 01 January 1985
STP34530S

A Comparison of Crack-Mouth Opening and Load-Line Displacement for J-Integral Evaluation Using Bend Specimens

Source

The measurement of the displacement at the crack mouth of three-point bend specimens is compared to the measurement of load-line displacement for crack-length and J-integral evaluation. For crack-length determination by the unloading technique, the correction that must be made when using a clip gage mounted on knife edges is derived from load-line and crack-mouth opening displacements expressed as a function of crack length. Experimental results with tough steels show excellent agreement between the crack lengths determined by the two types of displacement measurements. The J integral can be evaluated using either method. The agreement between the two methods of J evaluation depends essentially on the evaluation of crack length. It is concluded that the J integral may be measured easily with a clip gage mounted at the crack mouth of three-point bend specimens.

Author Information

Faucher, B
CANMET, Physical Metallurgy Research Laboratories, Ottawa, Ontario, Canada
Tyson, WR
CANMET, Physical Metallurgy Research Laboratories, Ottawa, Ontario, Canada
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Details
Developed by Committee: E08
Pages: 278–293
DOI: 10.1520/STP34530S
ISBN-EB: 978-0-8031-4923-6
ISBN-13: 978-0-8031-0419-8