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• W3136282899 startingPage "113749" @default.
• W3136282899 abstract "To take advantage of multi-material additive manufacturing technology using mixtures of metal alloys, a topology optimization framework is developed to synthesize high-strength spatially periodic metamaterials possessing unique thermoelastic properties. A thermal and mechanical stress analysis formulation based on homogenization theory is developed and is used in a regional scaled aggregation stress constraint method. Since specific load cases are not always known beforehand, a method of worst-case stress minimization is also included to efficiently address load uncertainty. It is shown that the two stress-based techniques lead to thermal expansion properties that are highly sensitive to small changes in material distribution and composition. To resolve this issue, a uniform manufacturing uncertainty method is utilized which considers variations in both geometry and material mixture. Test cases of high stiffness, zero thermal expansion, and negative thermal expansion microstructures are generated, and the stress-based and manufacturing uncertainty methods are applied to demonstrate how the techniques alter the optimized designs. Large reductions in stress are achieved while maintaining robust strength and thermal expansion properties." @default.
• W3136282899 created "2021-03-29" @default.
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• W3136282899 date "2021-06-01" @default.
• W3136282899 modified "2023-10-17" @default.
• W3136282899 title "Stress-based and robust topology optimization for thermoelastic multi-material periodic microstructures" @default.
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• W3136282899 doi "https://doi.org/10.1016/j.cma.2021.113749" @default.
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