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高压烧结是一种制备高性能热电材料的新方法。高压烧结热电材料在卸压过程中产生弹性后效,严重者产生裂纹并导致破裂。本文根据弹性后效产生原理,建立了一种简单的力学模型,并根据经典弹性力学理论计算出该模型下颗粒接触处的残余应力分布,并用ANSYS软件对该模型进行了有限元计算,有限元计算结果和理论计算结果一致,对进一步研究高压烧结热电材料产生残余应力导致成品破裂的机理具有很好的参考价值。
High pressure sintering is a new method for preparing high performance thermoelectric materials. High-pressure sintering thermoelectric materials in the pressure relief process after the elastic effect, in severe cases, cracks and lead to rupture. In this paper, a simple mechanical model is established based on the principle of elastic after-effect, and the residual stress distribution at the particle contact under this model is calculated according to classical elastic mechanics theory. The finite element method is used to calculate the model with finite element method The calculated results are consistent with the theoretical ones. It is of great value to further study the mechanism of residual stress in the high pressure sintering thermoelectric materials resulting in the rupture of finished products.