On Measuring Mixed Mode I/III Fracture Toughness of Ductile Materials using the Critical Stretch Zon
Kamat, SV
Scientist, Defence Metallurgical Research Laboratory, Kanchanbagh, Hyderabad, India, 500058

Srinivas, M
Scientist, Defence Metallurgical Research Laboratory, Kanchanbagh, Hyderabad, India, 500058

Rama Rao, P
Brahm Prakash Professor, International Advanced Research Centre for Powder Metallurgy and New Materials (ARCI), Balapur, Hyderabad, India, 500005

(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 $\left({\mathit{SZW}}_{\mathrm{c}}\right)$ for the blunting line is suggested. A further modification, also based on ${\mathit{SZW}}_{\mathrm{c}}$ 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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Author Kamat SV, Srinivas M, Rama Rao P Title On Measuring Mixed Mode I/III Fracture Toughness of Ductile Materials using the Critical Stretch Zon Symposium , Committee on