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http://dx.doi.org/10.3795/KSME-A.2003.27.9.1607

An Experimental Method for Measuring Q  

Kim, Dong-Hak (전남대학교 대학원 기계공학과)
Lee, Jeong-Hyun (전남대학교 대학원 기계공학과)
Kang, Ki-Ju (전남대학교 기계시스템공학부)
Publication Information
Transactions of the Korean Society of Mechanical Engineers A / v.27, no.9, 2003 , pp. 1607-1613 More about this Journal
Abstract
An experimental method to measure Q-parameter in-situ is described. The basic idea comes from the fact that the side necking near a crack tip indicates the loss of stress triaxiality, which can be scaled by Q. From the out-of-plane displacement and the in-plane strain near the surface of side necking, stress field averaged through the thickness is calculated and then Q is determined from the difference between the stress field and the HRR field corresponding to the identical J-integral. To prove the validity, three-dimensional finite element analysis has been performed for a CT configuration with side-groove. Q-value which was calculated directly from the near-tip stress field is compared with that determined by simulating the experimental procedure according to the proposed method, that is, the Q-value determined from the lateral displacement and the in-plane strain. In addition, the effect of location where the displacement and strain are measured is explored.
Keywords
J-Q Theory; Side Necking; CT Speciment; Finite Element; Method;
Citations & Related Records
Times Cited By KSCI : 3  (Citation Analysis)
연도 인용수 순위
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