Topology optimization of a multi-material thermal actuator

Abstract

The design and optimization of multi-material structure is attracting attention, because there is a possibility that the performance of the entire structure, which is difficult to achieve with a single material, can be realized by combining multiple materials effectively in one structure. In this research, in order to solve the difficult problem of improving the deformation characteristics as well as reducing the weight of the electric current-driven thermal actuator, density method - based topology optimization considering Joule heat generation, heat transfer and thermal expansion is investigated to determine the distribution of three types of materials including cavities. A validation study is also performed using geometry extracted from the optimization result. Results show that topology optimization is useful to find non-intuitive design of multi-material structure.