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- W4220794530 abstract "We introduce a computational framework for the topology optimization of cellular structures with spatially varying architecture, which is applied to functionally graded truss lattices under quasistatic loading. We make use of a first-order homogenization approach, which replaces the discrete truss by an effective continuum description to be treated by finite elements in a macroscale boundary value problem. By defining the local truss architecture through a set of Bravais vectors, we formulate the optimization problem with regards to the spatially varying basis vectors and demonstrate its feasibility and performance through a series of benchmark problems in 2D (though the method is sufficiently general to also apply in 3D, as discussed). Both the displacement field and the topology are continuously varying unknown fields on the macroscale, and a regularization is included for well-posedness. We argue that prior solutions obtained from aligning trusses along the directions of principal stresses are included as a special case. The outlined approach results in heterogeneous truss architectures with a smoothly varying unit cell, enabling easy fabrication with a tunable length scale (the latter avoiding the ill-posedness stemming from classical nonconvex methods without an intrinsic length scale)." @default.
- W4220794530 created "2022-04-03" @default.
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- W4220794530 date "2022-04-08" @default.
- W4220794530 modified "2023-10-02" @default.
- W4220794530 title "Topology Optimization of Graded Truss Lattices Based on On-the-Fly Homogenization" @default.
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- W4220794530 doi "https://doi.org/10.1115/1.4054186" @default.
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