| 概要 |
In order to apply thermoelectric generator (TEG) into engine exhausted heat recovery system, the thermoelectric module needs to be compact balancing between structural durability and thermal transfer characteristics. However, the manufacturing process of the thermoelectric module, which can be classified into two categories, is highly complicated. The first process is to bond the Cu electrodes onto the top and bottom surfaces of thermoelectric element, while certain residual stress and deformation are observed in itself. The second process is the module manufacturing which assembles large numbers of the bonded single elements with residual stress on the exhausted plate. Regarding the structural design, the arrangement and shape of the elements is very important to secure the strength and thermal efficiency, also to prevent damage and crack on the system. In this paper, we explored the multi-scale analysis for the whole manufacturing process of thermoelectric module by using Abaqus/Standard. The first process was analyzed on micro scale with fine mesh for acquiring precise results, subsequently the results were mapped onto the second process as macro scale analysis by an automatic mapping tool which we developed in this study. These analyses of processes could help us to minimize the residual stress and the design of the bonding arrangement. Furthermore the deformation and stress state under actual operation of the system were analyzed, and those results showed the enhanced efficiency of the electrical generation. Our proposed method contributed to new structural design concept to resolve the above mentioned issues.
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