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The 3D Surface Crack-Front Constraints in Welded Joins
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 Title & Authors
The 3D Surface Crack-Front Constraints in Welded Joins
Lee, Hyeong-Il; Seo, Hyeon;
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 Abstract
초록 The validity, of a single parameter such as stress intensity, factor K or J-integral in traditional fracture mechanics depends strongly on the geometry, and loading condition. Therefore the second parameter like T-stress measuring the stress constraint is additionally needed to characterize the general crack-tip fields. While many, research works have been done to verify, the J-T description of elastic-plastic crack-tip stress fields in plane strain specimens, limited works (especially. for bimaterials) have been performed to describe the structural surface crack-front stress fields with the two parameters. On this background, via detailed three dimensional finite element analyses for surface-cracked plates and straight pipes of homogeneous materials and bimaterials under various loadings, we investigate the extended validity or limitation of the two parameter approach. We here first develop a full 3D mesh generating program for semi-elliptical surface cracks, and calculate elastic T-stress from the obtained finite element stress field. Comparing the J-T predictions to the elastic-plastic stresses from 3D finite element analyses. we then confirm the extended validity of fracture mechanics methodology based on the J-T two parameters in characterizing the surface crack-front fields of welded plates and pipes under various loadings.
 Keywords
Fracture Mechanics;J-integral;T-Stress;Welded Joint;Constrain;Semi-Elliptical Surface Crack;Finite Element Analysis;
 Language
Korean
 Cited by
1.
T-형 및 L-형 배관내 반타원 표면균열에서의 구속상태,이형일;

대한기계학회논문집A, 2001. vol.25. 9, pp.1325-1333 crossref(new window)
2.
구속효과를 고려한 원자로 압력용기 균열선단에서의 응력분포 예측,김진수;최재붕;김영진;

대한기계학회논문집A, 2001. vol.25. 4, pp.756-763 crossref(new window)
3.
완전소성하 변형경화 이종접합재의 계면균열선단 구속상태 및 J-적분,이형일;김용범;

대한기계학회논문집A, 2003. vol.27. 7, pp.1159-1169 crossref(new window)
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