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Imperfect architected materials: Mechanics and topology optimization

  • Three-Dimensional Architected Materials and Structures
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Abstract

This article examines two intertwined topics on architected materials with imperfections—their mechanics and optimum design. We first discuss the main factors that control defect sensitivity along with a range of strategies for defect characterization. The potency of both as-designed and as-manufactured defects on their macroscopic response is highlighted with an emphasis on those caused by additive manufacturing technology. As a natural extension of defect sensitivity, we describe the design approaches for architected materials with particular focus on systematic tools of topology optimization. Recent extensions to formally incorporate imperfections in the optimization formulation are discussed, where the ultimate goal is to generate architectures that are flaw-tolerant and perform robustly in the presence of imperfections. We conclude with an outlook on the field, highlighting potential areas of future research.

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Acknowledgements

D.P. acknowledges the support provided by the Natural Sciences and Engineering Research Council of Canada (NSERC). J.K.G. acknowledges support provided by the National Science Foundation (NSF) under Grant No. 1538367 and the National Aeronautics and Space Administration (NASA) under Grant No. 80NSSC18K0428, as well as collaborations with M. Tootkaboni and M. Jalalpour related to the work in Figure 4. The opinions, findings, and conclusions or recommendations expressed in this paper are those of the authors and do not necessarily reflect the views of the NSF or NASA.

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Authors and Affiliations

  1. McGill University, Canada

    Damiano Pasini

  2. Johns Hopkins University, USA

    James K. Guest

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  1. Damiano Pasini
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Correspondence to Damiano Pasini.

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Pasini, D., Guest, J.K. Imperfect architected materials: Mechanics and topology optimization. MRS Bulletin 44, 766–772 (2019). https://doi.org/10.1557/mrs.2019.231

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