JSME International Journal Series A Solid Mechanics and Material Engineering
Online ISSN : 1347-5363
Print ISSN : 1344-7912
ISSN-L : 1344-7912
The Creep Line-Spring Model : Estimates of Creep Fracture Parameters for Surface-Cracked Plates
Chai GUOZHONGMasaki SHIRATORI
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1999 Volume 42 Issue 4 Pages 472-478

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Abstract

Extending the engineering approach for elastic-plastic fracture analysis(EPRI approach)to creep crack analysis, in this study we examine an engineering approach for estimating the displacement, crack-tip J and C integrals under nonsteady creep conditions. On the bases of the proposed engineering approach and the elastic-plastic line-spring method, a creep line-spring method is proposed and the fundamental equations are established. The creep line-spring method is used for estimating the creep fracture parameters for three-dimensional creep cracks. In order to check its accuracy, several surface-cracked plates under uniform tension are analyzed by the creep line-spring method and the three-dimensional finite-element method. The numerical results show that the creep line-spring method is in good agreement with the finite-element method and has the same accuracy as the common elastic-plastic line-spring method.

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