SEDL / STP / STP945-EB / STP23253S

Modifications of ASTM E 813-81 Standard Test Method for an Improved Definition of J^Ic Using New Blunting-Line Equation

Heerens, J
Research engineer, head of department, and research engineer, GKSS Research Center Geesthacht, Geesthacht,

Schwalbe, K-H
Research engineer, head of department, and research engineer, GKSS Research Center Geesthacht, Geesthacht,

Cornec, A
Research engineer, head of department, and research engineer, GKSS Research Center Geesthacht, Geesthacht,

Pages: 16    Published: Jan 1988

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Abstract

A test procedure for determining the fracture resistance of ductile metallic materials under stable crack growth conditions is described. The procedure consists of the determination of a J-Δa curve with particular emphasis on the near-initiation region. In our proposal, J^Ic is defined as the fracture resistance at 0.2-mm stable ductile tearing. It is determined by the intersection of the J-Δa curve with an intercept line which is parallel to and 0.2 mm off the blunting line. The blunting-line formula is improved by accounting for the strain hardening behavior of the material. A simple determination of the blunting-line equation is shown, and its applicability is checked using a broad range of materials.