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TECHNICAL PAPERS

Study of Residual Stress Distribution by a Combined Method of Moiré Interferometry and Incremental Hole Drilling, Part I: Theory

[+] Author and Article Information
Zhu Wu, Jian Lu

LASMIS Laboratory, Department of Mechanical Systems Engineering, University of Technology of Troyes, 12, rue Marie Curie, BP2060, 10010 Troyes Cedex, France

Bongtae Han

Mechanical Engineering department, 248 Flour Daniel Building EIB, Clemson University, Clemson, SC 29634

J. Appl. Mech 65(4), 837-843 (Dec 01, 1998) (7 pages) doi:10.1115/1.2791919 History: Received June 17, 1997; Revised March 31, 1998; Online October 25, 2007

Abstract

A new method combining Moiré interferometry and the incremental hole-drilling method is developed to determine both uniform and nonuniform residual stress distribution in depth. The study is reported in two parts. In this first part, the theoretical development of the moiré interferometry hole-drilling method is presented. The relationship between the in-plane surface displacements produced by introducing a blind hole and the corresponding residual stresses is established by employing the existing theoretical solution containing a set of undetermined coefficients. The coefficients are calibrated by the three-dimensional finite element method and they are processed nondimensionally for general use. The whole field in-plane surface displacements data Ux and Uy produced by the relaxation of residual stresses are obtained from moiré interferometry after each increment of hole drilling. The high signal-to-noise ratio provided by moiré interferometry allows accurate determination of fringe orders near the hole boundary which is essential for enhancing fidelity of residual stress determination. The experimental procedure to determine the signs of residual stresses is described and the accuracy of the method is also discussed.

Copyright © 1998 by The American Society of Mechanical Engineers
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