Non-linear least-squares solution to the moiré hole method problem in orthotropic materials. Part 1: Residual stresses |
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Authors: | J F Cárdenas-García S Ekwaro-Osire J M Berg W H Wilson |
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Institution: | (1) Department of Mechanical Engineering, University of Maryland, 20742 College Park, Maryland, USA;(2) Department of Mechanical Engineering, Texas Tech University, 79409 Lubbock, Texas, USA;(3) Indian Head Division, NSWC, Research and Technology Department, 20640-5053 Indian Head, MD, USA |
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Abstract: | The hole method problem relates to two inverse problems of interest: the first, most commonly addressed by practitioners,
is to obtain residual stresses; the other, generally neglected, inverse problem can be posed as either a stress separation
problem or a material elastic properties identification problem. In both this Paper I and Paper II, we pose and solve this
dual hole method problem in an orthotropic plate, using computer generated moiré isothetics, by means of a non-linear least-squares
approach. In Paper I we address the residual stress problem. In Paper II we pose the use of moiré isothetics as a means to
achieve separation of stresses, but we deal with the determination of the five orthotropic elastic constants, four of which
are independent. |
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Keywords: | Inverse problem least-squares moiré orthotropic residual stresses |
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