The thermal stress and strain occurring on a Bi-Te thermoelectric module subjected to variable thermal conditions were estimated based on three-dimensional elastic-plastic finite element method (FEM) analysis. The analysis showed that mechanical integrity of the interface between a Bi-Te thermoelement and electrodes of Al and Mo coatings formed by atmospheric plasma spraying was significantly reduced and that shear strain rose to 0.6~1.1% in the vicinity of the interface. Furthermore, to estimate the sensitivity of configurational parameters of the module to the thermal strain, statistical sensitivity analysis based on the design of experiment (DoE) and response surface method (RSM) was conducted. The statistical analysis revealed that the thickness of electrode coatings of Al and Mo affected the thermal strain and that the thinner Al coating and the thicker Mo coating reduced the thermal strain. In this study, a thermal fatigue test machine was newly developed with a view to verifying these analytical studies.
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The authors would like to express their sincere gratitude to Prof. T. Kajikawa who is the President of the Shonan Institute of Technology and is the Project Leader of the national project on the Development for Advanced Thermoelectric Conversion Systems for his excellent suggestions and fruitful discussion.
The aid of this research by the New Energy and Industrial Technology Development Organization (NEDO) is gratefully acknowledged.
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Nakatani, Y., Takaku, R., Hino, T. et al. Mechanical Aspects of Structural Optimization in a Bi-Te Thermoelectric Module for Power Generation. MRS Online Proceedings Library 842, 209–214 (2004). https://doi.org/10.1557/PROC-842-S4.7