ISSN: 1945-7553
CODEN: JTEVAB
Page Count: 7

On the Relationship Between Stretch Zone Formation and the J Integral for High Strain-Hardening Materials

Mills, WJ
Senior engineerMember of ASTM, Westinghouse Hanford Co., Richland, Wash.

Abstract

The relationship between stretch zone formation, associated with crack tip blunting, and the J integral was evaluated for materials with high strain-hardening capabilities: Incoloy® 800, Inconel® 600, SA-387 Grade C steel, Type 304 stainless steel, and Alloy A-286. A conventional blunting line commonly used in the construction of a J integral crack growth resistance curve accurately describes stretch zone formation in intermediate and high strength alloys. For low-strength, high strain-hardening materials, however, this conventional blunting line overestimates apparent crack extension associated with stretch zone formation, and it results in an overestimation of ductile fracture toughness values. An alternative blunting line that better describes stretch zone formation in this class of materials is proposed.

Keywords:
fracture (materials), cracking (fracturing), strains, ductile fracture, crack tip blunting, J integral, crack opening displacement, fracture toughness testing

Paper ID: JTE10648J
DOI: 10.1520/JTE10648J
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