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Stress Intensity factor Analysis for Three-Dimensional Cracks in Inhomogeneous Materials  

김준수 (경기대학교 기계공학과 대학원)
이준성 (경기대학교 기계시스템디자인공학부)
Publication Information
Journal of the Korean Society for Precision Engineering / v.20, no.4, 2003 , pp. 197-203 More about this Journal
Abstract
Accurate stress intensity factor analyses and crack growth rate of surface -cracked components in inhomogeneous materials are needed fur reliable prediction of their fatigue life and fracture strengths. This paper describes an automated stress intensity factor analysis of three-dimensional (3D) cracks in inhomogeneous materials. 3D finite element method (FEM) was used to obtain the stress intensity factor fur subsurface cracks and surface cracks existing in inhomogeneous materials. To examine accuracy and efficiency of the present system, the stress intensity factor for a semi-elliptical surface crack in a plate subjected to uniform tension is calculated, and compared with Raju-Newman's solutions. Then the system is applied to analyze cladding effect of subsurface cracks in inhomogeneous materials. The results were compared with those surface cracks in homogeneous materials. It is clearly demonstrated from these analyses that the stress intensity factors for subsurface cracks are less than those of surface cracks. Also, this system is applied to analyze cladding effect of surface cracks in inhomogeneous materials.
Keywords
Inhomogeneous Materials; Stress Intensity Factor; Finite Element Analysis; Surface Crack; Cladding; Subsurface Crack;
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