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RESEARCH PAPERS

Far-Field Initial Response of Acoustic Emission From Cracking in a Weldment

[+] Author and Article Information
C.-K. Fang

Department of Mechanical Engineering, China Institute of Technology and Commerce, Nankang, Taipei, Taiwan, R.O.C.

E. Kannatey-Asibu, J. R. Barber

Department of Mechanical Engineering and Applied Mechanics, University of Michigan, Ann Arbor, MI 48109

J. Manuf. Sci. Eng 119(3), 281-289 (Aug 01, 1997) (9 pages) doi:10.1115/1.2831105 History: Received October 01, 1993; Revised April 01, 1995; Online January 17, 2008

Abstract

An analytical expression is developed for the relationship between far-field acoustic emission (AE) signal and the propagation of a finite plane crack due to a nonuniform residual stress in a weldment. The AE sensor is situated at the boundary parallel to the crack surface. The quasi-static crack opening displacement (COD) rate is used as the source function. The AE initial response on a traction-free surface is obtained as a function of instantaneous crack length and speed. A closed-form expression is obtained for the normal surface displacement at the epicenter when the crack propagates at uniform speed for a finite duration between initiation and arrest. Results from an earlier analysis of the (variable) speed of crack propagation in a weldment are used to develop a more exact numerical prediction of the surface motion. The effects of initial crack length and bluntness on AE surface motion are investigated in both time and frequency domains.

Copyright © 1997 by The American Society of Mechanical Engineers
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