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Yunhui Zhu Bradley Department of Electrical and Computer Engineering, Virginia Tech, Blacksburg, Virginia 24061, USA

Hang Z. Yua) Department of Materials Science and Engineering, Virginia Tech, Blacksburg, Virginia 24061, USA (Received 1 June 2017; accepted 20 July 2017)

Mesoscale heterogeneous material systems are efficient and adaptive to real world environments, owing to the non-uniform stress fields that result from the convolution of component geometries, loading conditions, and environmental changes. With the advent of multi-material additive manufacturing, the production of heterogeneous material systems with a pre-defined mesoscale material distribution becomes feasible. This unlocks the design freedom at a characteristic length scale between the macroscale geometry and microstructures, but also calls for a new design framework to optimize the mesoscale material distribution in multi-material additive manufacturing. Here, we propose and demonstrate such a design framework by incorporating digital image correlation-based deformation mapping with 3D finite element modeling-based computational optimization. The constitutive behavior of each constituent material or their mixtures is calibrated by matching the local deformation data. The optimal mesoscale material distribution can then be determined using global optimization algorithms and validated experimentally. Hang Yu is an Assistant Professor of Materials Science and Engineering at Virginia Polytechnic Institute and State University (Virginia Tech). He received his Bachelor’s degree in physics from Peking University in 2007 and his Ph.D. degree in materials science and engineering from Massachusetts Institute of Technology in 2013. His Ph.D. work was advised by Professor Carl Thompson, with a focus on understanding the mechanisms of intrinsic stress evolution during thin film growth. Before joining Virginia Tech in January 2016, he conducted his postdoctoral research on materials design and shape memory materials with Professor Christopher Schuh at Massachusetts Institute of Technology.

Hang Z. Yu

Dr. Yu’s research group at Virginia Tech works at the interfaces of materials science, additive manufacturing, and mechanical design, with a focus on the design and processing of emerging structural materials. Experiment, theory, and simulation are integrated to understand the fundamental deformation, phase transformation, and structure evolution mechanisms. With these fundamental insights, materials with the optimal mesostructure and microstructure can be designed and processed in order to achieve extraordinary mechanical properties, such as high energy dissipation, superelasticity, or superior fracture toughness. Dr. Yu and his students study the material structures across multiple length scales: mesoscale material and property distribution, microscale grain and twin structures, and nanoscale phase and composition heterogeneities. Dr. Yu is excited to continue his contribution to the field of materials research with his research group at Virginia Tech.

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