Incremental Computation Technique for Residual Stress Calculations Using the Integral Method |
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Authors: | G S Schajer T J Rickert |
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Institution: | (1) Department Mechanical Engineering, University of British Columbia, Vancouver, BC, Canada, V6T 1Z4;(2) American Stress Technologies, Cheswick, PA, USA |
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Abstract: | The Integral Method for determining residual stresses involves making surface deformation measurements within a sequence of
small increments of material removal depth. Typically, the associated matrix equation for solving the residual stresses within
each depth increment is ill-conditioned. The resulting error sensitivity of the residual stress evaluation makes it essential
that data measurement errors are minimized and that the residual stress solution method be as stable as possible. These two
issues are addressed in this paper. The proposed method involves using incremental deformation data instead of the total deformation
data that are conventionally used. The technique is illustrated using an example ESPI hole-drilling measurement. |
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