ISSN: 1945-7553
CODEN: JTEVAB
Page Count: 6

A New Method for the Determination of the Critical Value of Crack Tip Opening Displacement at the Initiation of Crack Growth Using a Single Three-Point Bend Specimen

Lai, Z
Professor of Metal Physics and lecturer, Northeast Institute of Technology (NEIT), Shenyang, Liaoning

Zhang, J
Professor of Metal Physics and lecturer, Northeast Institute of Technology (NEIT), Shenyang, Liaoning

Abstract

An analytical method for the determination of critical value of crack tip opening displacement at initiation of crack growth δ_c of a three-point bend specimen is presented. It is based on the formulation of subcritical crack growth in such a specimen. The values of δ_c obtained by this single specimen method are in excellent agreement with those obtained by the standard multispecimen method. It is emphasized that it would be necessary to use blunting line correction when the multispecimen method is used.

Keywords:
crack initiation, subcritical crack growth, three-point bend specimen, crack tip opening displacement, single specimen method, multispecimen method, elastic-plastic fracture toughness

Paper ID: JTE10693J
DOI: 10.1520/JTE10693J
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