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• W2896796166 abstract "Abstract We are concerned with optimization of macroscale elastic structures that are designed utilizing spatially varying microscale metamaterials. The macroscale optimization is accomplished using gradient-based nonlinear topological optimization. But instead of using density as the optimization decision variable, the decision variables are the multiple parameters that define the local microscale metamaterial. This is accomplished using single layer feedforward Gaussian basis function networks as a surrogate models of the elastic response of the microscale metamaterial. The surrogate models are trained using highly resolved continuum finite element simulations of the microscale metamaterials and hence are significantly more accurate than analytical models e.g. classical beam theory . Because the derivative of the surrogate model is important for sensitivity analysis of the macroscale topology optimization , a neural network training procedure based on the Sobolev norm is described. Since the SIMP method is not appropriate for spatially varying lattices , an alternative method is developed to enable creation of void regions. The efficacy of this approach is demonstrated via several examples in which the optimal graded metamaterial outperforms a traditional solid structure." @default.
• W2896796166 created "2018-10-26" @default.
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• W2896796166 date "2019-04-01" @default.
• W2896796166 modified "2023-10-16" @default.
• W2896796166 title "Multiscale topology optimization using neural network surrogate models" @default.
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• W2896796166 doi "https://doi.org/10.1016/j.cma.2018.09.007" @default.
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