열팽창을 고려한 다중 재료 구조물의 응력 기반 위상최적설계

Abstract

This paper presents a stress-based topology optimization method of multi-material structure by considering thermal expansion. As the use of multiple materials increases with the demand for lightweight structure design, the design with mixedmaterials using welding and adhesion is increasing. However, the different thermal expansion between dissimilar materials make the unexpected stress increments on the interface area, and it could lead to the product failure. In this paper, we performed a multi-material topology optimization by considering thermal expansion due to the temperature change. The optimization problem minimizes the mass with the displacement and the stress constraints of each materials is formulated. It is confirmed that the optimum result has different layouts depending on the change of temperature, and we can get a robust design against the temperature change by taking into account the multiple temperature conditions.