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• W2738624871 abstract "Additive fabrication technologies are limited by the types of material they can print: while the technologies are continuously improving, still only a relatively small discrete set of materials can be used in each printed object. At the same time, the low cost of introducing geometric complexity suggests the alternative of controlling the elastic material properties by producing microstructures , which can achieve behaviors significantly differing from the solid printing material. While promising results have been obtained in this direction, fragility is a significant problem blocking practical applications, especially for achieving soft material properties: due to stress concentrations at thin joints, deformations and repeated loadings are likely to cause fracture. We present a set of methods to minimize stress concentrations in microstructures by evolving their shapes. First, we demonstrate that the worst-case stress analysis problem (maximizing a stress measure over all possible unit loads) has an exact solution for periodic microstructures. We develop a new, accurate discretization of the shape derivative for stress objectives and introduce a low-dimensional parametric shape model for microstructures. This model supports robust minimization of maximal stress (approximated by an L p norm with high p ) and an efficient implementation of printability constraints. In addition to significantly reducing stresses (by a typical factor of 5X), the new method substantially expands the range of effective material properties covered by the collection of structures." @default.
• W2738624871 created "2017-07-31" @default.
• W2738624871 creator A5043316497 @default.
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• W2738624871 date "2017-07-20" @default.
• W2738624871 modified "2023-10-16" @default.
• W2738624871 title "Worst-case stress relief for microstructures" @default.
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• W2738624871 doi "https://doi.org/10.1145/3072959.3073649" @default.
• W2738624871 hasPublicationYear "2017" @default.
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