When plastic damage regions are accumulated in a material, there exist residual displacements on the surface of the material after all the loadings are removed. The residual displacements are defined as the difference between before and after loading, and can be measured experimentally without destruction of the material. This paper addresses the problem of evaluating the residual stress field caused by the accumulation of the plastic damage regions in a subdomain of the material. The problem is formulated as a system of integral equations relating the surface displacements to the unknown plastic strains. The damage domain, which appears as the domain of integration of the integral equations, is also unknown. Determination of the shape of the damage domain, together with the plastic strains, is a very complicated nonlinear problem. In addition to the residual surface displacement data, it requires more information about the loading history or other restrictive assumptions. However, the residual stress field in the vicinity of the damage domain is obtained after the equivalent damage domain and the equivalent plastic strains are introduced. The problem is an inverse problem, which is substantially different from the conventional forward analysis of structural mechanics. Special attention is given to the uniqueness and stability of the solution.
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September 1989
Research Papers
On the Inversion of Residual Stresses From Surface Displacements
Zhanjun Gao,
Zhanjun Gao
Department of Civil Engineering, Northwestern University, Evanston, IL 60208
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T. Mura
T. Mura
Department of Civil Engineering, Northwestern University, Evanston, IL 60208
Search for other works by this author on:
Zhanjun Gao
Department of Civil Engineering, Northwestern University, Evanston, IL 60208
T. Mura
Department of Civil Engineering, Northwestern University, Evanston, IL 60208
J. Appl. Mech. Sep 1989, 56(3): 508-513 (6 pages)
Published Online: September 1, 1989
Article history
Received:
October 13, 1988
Revised:
February 6, 1989
Online:
July 21, 2009
Citation
Gao, Z., and Mura, T. (September 1, 1989). "On the Inversion of Residual Stresses From Surface Displacements." ASME. J. Appl. Mech. September 1989; 56(3): 508–513. https://doi.org/10.1115/1.3176119
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