In situ ultrasonic measurement of crack closure

被引：32

作者：

Rokhlin, SI ^{[1
]}

Kim, JY ^{[1
]}

机构：

[1] Ohio State Univ, Nondestruct Evaluat Program, Edison Joining Technol Ctr, Columbus, OH 43221 USA

来源：

INTERNATIONAL JOURNAL OF FATIGUE | 2003年 / 25卷 / 01期

关键词：

fatigue; crack closure stress measurement; surface acoustic wave; in situ experiment;

D O I：

10.1016/S0142-1123(02)00056-7

中图分类号：

TH [机械、仪表工业];

学科分类号：

0802 ;

摘要：

This paper describes a surface acoustic wave method for the measurement of crack closure/opening stress during fatigue testing. The dependence of surface wave signature on fatigue load reveals the crack opening/closure characteristics displayed during the fatigue cycle, from which the crack-mouth-opening and fully-crack-opening stresses are determined as functions of the number of cycles. The change of crack closure loads during fatigue life is interpreted by a simple model describing crack growth inside the pit-induced plastic yield zone. The loading-unloading hysteresis is observed and related to the movement of the crack opening/closure front across the boundary of the plastic yield zone during the crack opening-closing process. Examples are given for fatigue tests on Al 2024-T3 and Inconel 718 samples in which the surface fatigue crack initiated from a surface pit. (C) 2002 Elsevier Science Ltd. All rights reserved.

引用

页码：51 / 58

页数：8

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