ISSN: 1945-7553
CODEN: JTEVAB
Published Online: 1 December 2005
Page Count: 10

On Measuring Mixed Mode I/III Fracture Toughness of Ductile Materials Using the Critical Stretch Zone Width

Kamat, SV
Scientist, Defence Metallurgical Research Laboratory, Kanchanbagh, Hyderabad,

Srinivas, M
Scientist, Defence Metallurgical Research Laboratory, Kanchanbagh, Hyderabad,

Rama Rao, P
Brahm Prakash Professor, International Advanced Research Centre for Powder Metallurgy and New Materials (ARCI), Balapur, Hyderabad,

(Received 4 February 2004; accepted 22 August 2005)

Abstract

Mixed mode fracture I/III toughness determination for ductile materials currently uses an empirical equation for the blunting line. A modification based on the use of experimental measurements of the critical stretch zone width (SZW_c) for the blunting line is suggested. A further modification, also based on SZW_c measurements, that gives a notch root independent mixed mode I/III fracture toughness from a single specimen is described. Mixed mode fracture toughness tests on Armco iron, CP titanium, mild steel, and nickel have been carried out to evaluate these methods.

Keywords:
mixed mode I/III fracture toughness, stretch zone width, blunting line, constraint factor

Paper ID: JTE12586
DOI: 10.1520/JTE12586
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