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Numerical Study on the Thermal Stress and its Formation Mechanism of a thermoelectric Device

Journal of Thermal Science 2018年第3期27卷 249-258页

作者： PAN Tao GONG Tingrui YANG Wei WU Yongjia Product Engineering Department Wuhan Branch of SAIC-GM ltd Wuhan 430200 China Microsystem and Terahertz Research Center China Academy of Engineering Physics Chengdu 610200 China Institute of Electronic Engineering China Academy of Engineering Physics Mianyang 621999 China Hubei Institute of Aerospace Chemical Technology Xiangyang 441000 China School of Mechanical Engineering Virginia Polytechnic Institute and State University Blacksburg 24060 USA

The strong thermo-mechanical stress is one of the most critical failure mechanisms that affect the durability of thermoelectric devices. In this study, numerical simulations on the formation mechanism of the maximum thermal stress inside the thermoelectric device have been performed by using finite element method. The influences of the material properties and the thermal radiation on the thermal stress have been examined. The results indicate that the maximum thermal stress was located at the contact position between the two materials and occurred due to differential thermal expansions and displacement constraints of the materials. The difference in the calculated thermal stress value between the constant and the variable material properties was between 3% and 4%. At a heat flux of 1 W·cm^(-2) and an emissivity of 0.5, the influence of the radiation heat transfer on the thermal stress was only about 5%; however, when the heat flux was 20 W·cm^(-2) and the emissivity was 0.7, the influence of the radiation heat transfer was more than 30%.

关键词： solar thermoelectric power generator Thermal Stress Thermal Radiation Numerical Simulation

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