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Tunable mechanical properties through texture control of polycrystalline additively manufactured materials using adjoint-based gradient optimization

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Abstract

Polycrystalline materials can be characterized by the preferred orientation of grains within a material, otherwise known as texture. It has been shown that texture can affect a wide range of mechanical properties in metallic materials, including elastic moduli, yield stress, strain hardening, and fracture toughness. Recent advances in additive manufacturing of metallic materials allow for controlling the spatial variation of texture and thus provide a path forward for controlling material properties through additive manufacturing. This paper investigates the benefits, in terms of mechanical performance, of varying texture spatially. We examine the material properties of a hole in a plate under load and use an adjoint-based gradient optimization algorithm coupled with a finite element solver. The method of adjoints allows for efficient calculation of design problems in a large variable space, reducing overall computational cost. As a first step to general texture optimization, we consider the idealized case of a pure fiber texture where the homogenized properties are transversely isotropic. In this special case, the only spatially varying design variables are the angles that describe the orientation of the homogenized material at each point within the structure. Material angles for both a spatially homogeneous and a spatially heterogeneous material are optimized for quantities of interest, such as compliance and von Mises stress. Additionally, the combined effects of elasticity tensor and material orientation on optimized structures are explored, as the additive manufacturing processes can potentially vary both. This work paves a way forward to design metallic materials with tunable mechanical properties at the microstructure level and is readily adapted to other materials.

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Acknowledgements

The authors would like to acknowledge Sandia National Labs for supporting this research. The authors would also like to thank Judy Brown, Joseph Bishop, and Eliot Fang for their immensely helpful discussions. Additionally, the authors would like to thank Sam Raymond and Maysam Bandpay for their insightful discussions. Authors also appreciate support from the NDSEG Fellowship.

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Authors and Affiliations

  1. Laboratory for Atomistic and Molecular Mechanics (LAMM), Department of Civil and Environmental Engineering, Massachusetts Institute of Technology, 77 Massachusetts Ave., Cambridge, MA, 02139, USA

    Grace X. Gu & Markus J. Buehler

  2. Department of Mechanical Engineering, Massachusetts Institute of Technology, 77 Massachusetts Ave., Cambridge, MA, 02139, USA

    Grace X. Gu

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  1. Grace X. Gu
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  2. Markus J. Buehler
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Correspondence to Markus J. Buehler.

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Gu, G.X., Buehler, M.J. Tunable mechanical properties through texture control of polycrystalline additively manufactured materials using adjoint-based gradient optimization. Acta Mech 229, 4033–4044 (2018). https://doi.org/10.1007/s00707-018-2208-1

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  • DOI: https://doi.org/10.1007/s00707-018-2208-1

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