ISSN: 0090-3973
Page Count: 4

A Proposal for Specimen Size Requirements in Toughness Qualification with the Weibull Stress Criterion

Miyata, T
Professor,Materials Science & Engineering, Nagoya University,

Tagawa, T
Associate professor,Materials Science & Engineering, Nagoya University,

Yang, H
Graduate student,Materials Science & Engineering, Nagoya UniversitySumitomo Construction Machinery Co., Ltd.,

(Received 20 April 1999; accepted 1 October 1999)

Abstract

The specimen size requirements in toughness qualification are discussed on the basis of a statistical local fracture criterion approach. The Weibull stress criterion for cleavage fracture is applied to the constraint loss field at the crack tip described with the toughness scaling model (TSM). The proposed new model demonstrates that the TSM is a particular case for a material with a particular combination of the Weibull shape parameter, m, and the strain hardening exponent, n. Based on this model, alternative size requirements for ASTM standards are proposed.

Keywords:
cleavage fracture toughness, crack tip stress field, J-integral, specimen size requirement, constraint loss, toughness scaling model, Weibull stress, Weibull shape parameter

Paper ID: JTE12076J
DOI: 10.1520/JTE12076J
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