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• W3186987139 abstract "This article proposes a coupled thermomechanical finite element model tailored to the part-scale simulation of metal additive manufacturing processes such as selective laser melting. A first focus lies on the derivation of a consistent constitutive law on basis of a Voigt-type spatial homogenization procedure across the relevant phases, powder, melt and solid. The proposed constitutive law accounts for the irreversibility of phase change and consistently represents thermally induced residual stresses. In particular, the incorporation of a reference strain term, formulated in rate form, allows to consistently enforce a stress-free configuration for newly solidifying material at melt temperature. Application to elementary test cases demonstrates the validity of the proposed constitutive law and allows for a comparison with analytical and reference solutions. Moreover, these elementary solidification scenarios give detailed insights and foster understanding of basic mechanisms of residual stress generation in melting and solidification problems with localized, moving heat sources. As a second methodological aspect, mortar meshtying strategies are proposed for the coupling of successively applied powder layers. This approach allows for very flexible mesh generation for complex geometries. As compared to collocation-type coupling schemes, e.g., based on hanging nodes, these mortar methods enforce the coupling conditions between non-matching meshes in an $L^2$-optimal manner. The combination of the proposed constitutive law and mortar meshtying approach is validated on three-dimensional examples with rather complex geometry, representing a first step towards part-scale predictions." @default.
• W3186987139 created "2021-08-02" @default.
• W3186987139 creator A5037818011 @default.
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• W3186987139 date "2021-07-23" @default.
• W3186987139 modified "2023-09-27" @default.
• W3186987139 title "A simple yet consistent constitutive law and mortar-based layer coupling schemes for thermomechanical part-scale simulations of metal additive manufacturing processes" @default.
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• W3186987139 hasPublicationYear "2021" @default.
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