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http://dx.doi.org/10.3795/KSME-A.2004.28.7.1021

Methods to Evaluate Stress Triaxiality from the Side Necking Near the Crack Tip  

Kim, Dong-Hak (한국원자력연구소 사용후핵연료기술개발부)
Kang, Ki-Ju (전남대학교 기계시스템공학부)
Publication Information
Transactions of the Korean Society of Mechanical Engineers A / v.28, no.7, 2004 , pp. 1021-1028 More about this Journal
Abstract
Kim et al. suggested an experimental method to determine the Q parameter in situ from the out-of-plane displacement and the in-plane strains on the surface of side necking near the crack tip. In this paper, the procedure to evaluate the stress triaxiality near a crack tip such as the Q parameter is to be polished in the details for simplicity and accuracy. That is, Q and hydrostatic stress are determined only from the out-of-plane displacement, but not using in-plane strain, which is hard to measure. And also, the plastic modulus is determined by an alternative way. Through three-dimensional finite element analyses for a standard CT specimen with 20% side-grooves, the validities of the new procedures are examined in comparison to the old ones. The effect of location where the displacements are measured to determine the stress triaxiality is explored.
Keywords
Out-of-Plane Displacement; Constraint Loss; Side Necking; CT Specimen; Finite Element Method;
Citations & Related Records
Times Cited By KSCI : 1  (Citation Analysis)
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