Abstract
Cloaking structure designs have been widely performed in a form of metamaterial development. However, physics-based design approach makes it difficult to define complex material profiles. This study proposes an alternative design method for multi-directional cloak design via topology optimization method using a dielectric material. The phase field design method, which uses the reaction-diffusion equations combined with the double well potentials as the update scheme for design variables, is employed for systematic derivation of a topological configuration of the cloaking structure. In addition, the concept of symmetric design sensitivity mapping is introduced for multi-directional cloaking effect. Design results of four-, six- and eight-directional cloak are presented, and experimental verification was performed for six-directional cloak using the fabricated structure through 3D printing technology.
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No potential conflict of interest was reported by the author(s).
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Notes on contributors
Mingook Jung
Mingook Jung is studying for Ph.D. degree at Mechanical Engineering Department, Yonsei University, Seoul, Korea.
Namjoon Heo
Namjoon Heo got his Ph.D. degree at Mechanical Engineering Department, Yonsei University. He is working at the SK innovation Institute of Technology Innovation, Daejeon, Korea.
Jinwoo Park
Jinwoo Park got his Ph.D. degree at Hanyang University, Seoul, Korea. He is working at Agency for Defense Development, Daejeon, Korea.
Jeonghoon Yoo
Jeonghoon Yoo got his Ph.D. degree at University of Michigan, Ann Arbor, USA. He is working at Mechanical Engineering Department, Yonsei University, as a professor.