Abstract
The negative Poisson’s ratio (NPR) structure is the typical metamaterial structure that has excellent mechanical performances and other functional properties. This paper employs the NPR structure to improve the fracture resistance and flexibility of the wearable thermoelectric generator (TEG). The analytical models of the fatigue life and power output of the NPR-TEG for powering the wearable electronics are proposed. Effect of the wearing position of the generator on the human body on the fatigue life is evaluated. It is found that the fatigue life of the traditional TEG is greatly enhanced by employing the NPR structure. Fatigue life of the NPR-TEG decreases with the thickness of the cell wall and the angle. The relative fatigue life between the NPR-TEG and the traditional TEG hardly varies with the wearing position of human body. The power output of the NPR-TEG is inversely linear proportional to length and number of the fatigue crack. The obtained results can be used to optimize and predict the fatigue life of the flexible wearable thermoelectric devices.
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