Abstract

Abstract In service, PTC-components have to withstand large temperature changes, which result from their electric working conditions. These temperature changes cause large temperature differences due to heat transport and inhomogeneously distributed heat sources. As a result, thermo-mechanical stresses occur, which my cause the failing of the component. A physical model is presented which makes the calculation of mechanical stresses in PTC components in dependence on the electrical loading possible, if the relevant material parameters are known. The interaction between the electric field equations and the equation of the thermal diffusion is taken into account, and the electric and the temperature field in dependence of the position in the PTC is calculated. Then the mechanical stress field and the failure rate is determined. This model is then used to reduce temperature differences (thermal management) and – in consequence – mechanical stresses in PTC components by selection of more suitable PTC material...

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