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Optimizing the Compressive Strength of Strain-Hardenable Stretch-Formed Microtruss Architectures

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Abstract

The mechanical performance of stretch-formed microtrusses is determined by both the internal strut architecture and the accumulated plastic strain during fabrication. The current study addresses the question of optimization, by taking into consideration the interdependency between fabrication path, material properties and architecture. Low carbon steel (AISI1006) and aluminum (AA3003) material systems were investigated experimentally, with good agreement between measured values and the analytical model. The compressive performance of the microtrusses was then optimized on a minimum weight basis under design constraints such as fixed starting sheet thickness and final microtruss height by satisfying the Karush–Kuhn–Tucker condition. The optimization results were summarized as carpet plots in order to meaningfully visualize the interdependency between architecture, microstructural state, and mechanical performance, enabling material and processing path selection.

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Acknowledgments

The authors would like to especially thank Dr. C.A. Steeves for helpful discussions, A.T. Lausic, C. Kwan, S. Boccia, and Dr. D. Grozea of the University of Toronto for their contributions. Finally, financial support from the Natural Sciences and Engineering Research Council of Canada (NSERC) is gratefully acknowledged.

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Authors and Affiliations

  1. Department of Materials Science and Engineering, University of Toronto, 184 College Street, Toronto, ON, Canada

    Bosco Yu (Ph.D. Candidate), Khaled Abu Samk (Ph.D. Candidate) & Glenn D. Hibbard (Associate Professor, Associate Chair of Undergraduate Studies)

  2. University of Cambridge, Cambridge, UK

    Bosco Yu (Ph.D. Candidate)

Authors
  1. Bosco Yu
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  2. Khaled Abu Samk
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  3. Glenn D. Hibbard
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Correspondence to Glenn D. Hibbard.

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Manuscript submitted February 25, 2014.

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Yu, B., Abu Samk, K. & Hibbard, G.D. Optimizing the Compressive Strength of Strain-Hardenable Stretch-Formed Microtruss Architectures. Metall Mater Trans A 46, 1985–1994 (2015). https://doi.org/10.1007/s11661-015-2774-y

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