Crack Analysis under Fretting Condition by Rounded Punch

- Journal title : Transactions of the Korean Society of Mechanical Engineers A
- Volume 24, Issue 6, 2000, pp.1565-1574
- Publisher : The Korean Society of Mechanical Engineers
- DOI : 10.22634/KSME-A.2000.24.6.1565

Title & Authors

Crack Analysis under Fretting Condition by Rounded Punch

Kim, Hyeong-Gyu; Jeong, Yeon-Ho;

Kim, Hyeong-Gyu; Jeong, Yeon-Ho;

Abstract

Surface edge crack subjected to contact stresses is analysed. A punch with corner radii is considered to press the semi-infinite plane. Partial slip problem is solved when a shear force is applied to the punch. Dislocation density function method is used to solve the present mixed mode crack problem. The crack length of positive K1 is examined, which is affected by the ratio of the flat portion to the total width of the punch. Surface traction during one cycle of the shear force is evaluated to simulate the fretting condition. The compliance change of the contact surface is also investigated during the shear cycle. It is found that the crack grows during only a part of the cycle, which may be termed as effective period of crack growing. A design method for restraining the fretting failure is discussed, from which recommendable geometry of the punch is suggested.

Keywords

Rounded Punch;Stress Intensity Factor;Partial Slip;Effective Period of Crack Growing;Fretting Failure;

Language

Korean

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