Miniaturization and high-density packaging of power modules for use in vehicles increases the amount of heat they generate. To prevent damage from heat in such packages, we designed, optimized, and fabricated a composite roll laminated with a non-bonded graphite sheet and Al foil. To find the optimal design of this material, we used finite element analysis to model a non-bonded Al/graphite laminated roll composite, using this simulation to assess how the geometry of its constituent materials influenced its thermal stress. Based on this work, we found that the larger the aspect ratio of the Al foil, the greater the deformability of the composite and the higher its stress relaxation effect. In addition, we found that sandwiching the graphite sheet between the Al foil deforms the foil into a convex shape, and that the Al/graphite laminate composite shows higher thermal stress relaxation than the Al foil does on its own.

中文翻译：

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非粘结铝/石墨层合辊复合材料热应力松弛机理

用于车辆的功率模块的小型化和高密度包装会增加它们产生的热量。为了防止此类包装中的热量损坏，我们设计，优化和制造了一种复合辊，该复合辊由无粘结的石墨片和铝箔层压而成。为了找到这种材料的最佳设计，我们使用有限元分析对非粘结的Al /石墨层压辊复合材料进行建模，并使用此仿真评估其组成材料的几何形状如何影响其热应力。基于这项工作，我们发现铝箔的纵横比越大，复合材料的可变形性越大，其应力松弛效果就越高。此外，我们发现将石墨片夹在铝箔之间会使铝箔变形为凸形，