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Mixed-Mode Stress intensity Factors for Elliptical Corner Cracks in Mechanical Joints by Weight Function Method

가중함수법에 의한 기계적 체결부에 존재하는 타원형 모서리균열의 혼합모드 응력확대계수

  • Heo, Sung-Pil (Dept.of Mechanical Engineering, Graduate School of Sungkyunkwan University) ;
  • Yang, Won-Ho (Dept.of Mechanical Engineering, Sungkyunkwan University) ;
  • Kim, Cheol
  • 허성필 (성균관대학교 대학원 기계공학과) ;
  • 양원호 (성균관대학교 기계공학부) ;
  • 김철 (성균관대학교 대학원 기계공학과)
  • Published : 2001.04.01

Abstract

Mechanical joints such as bolted or riveted joints are widely used in structural components and the reliable determination of the stress intensity factors for corner cracks in mechanical joints is needed to evaluate the safety and fatigue life. This paper analyzes the mixed-mode stress intensity factors of surface and deepest points for quarter elliptical corner cracks in mechanical joints by weight function method and the coefficients included in weight function are determined by finite element analyses for reference loadings. The extended form of the weight function method for two-dimensional mixed-mode to three-dimensional is presented and the number of terms in weight function is determined by comparing the results for the different number of terms. The amount of clearance is an important factor in evaluating the severity of elliptical corner cracks in mechanical joints and even horizontal crack normal to the applied load is under mixed-mode in the case that clearance exists.

Keywords

Weight Function Method;Mechanical Joint;Elliptical Corner Crack;Clearance;Contact;Finite Element Method

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