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• W3040488347 abstract "We consider arbitrary preexisting residual stress states in arbitrarily shaped, unloaded bodies. These stresses must be self-equilibrating and traction free. Common treatments of the topic tend to focus on either the mechanical origins of the stress, or methods of stress measurement at certain locations. Here we take the stress field as given and consider the problem of approximating any such stress field, in a given body, as a linear combination of predetermined fields which can serve as a basis. We consider planar stress states in detail, and introduce an extremization problem that leads to a linear eigenvalue problem. Eigenfunctions of that problem form an orthonormal basis for all possible residual stress states of sufficient smoothness. In numerical examples, convergence of the approximating stress fields is demonstrated in the $L^2$ norm for continuous stress fields as well as for a stress field with a simple discontinuity. Finally, we outline the extension of our theory to three dimensional bodies and states of stress. Our approach can be used to describe arbitrary preexisting residual stress states in arbitrarily shaped bodies using basis functions that are determined by the body geometry alone." @default.
• W3040488347 created "2020-07-10" @default.
• W3040488347 creator A5020129235 @default.
• W3040488347 creator A5059996642 @default.
• W3040488347 date "2020-12-01" @default.
• W3040488347 modified "2023-10-14" @default.
• W3040488347 title "Basis functions for residual stresses" @default.
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• W3040488347 doi "https://doi.org/10.1016/j.amc.2020.125468" @default.
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