Thermoelastoplastic Deformation Analysis of Electromechanical Equipments under Electrocaloric Shock

A coupled thermomechanical model is presented to investigate the thermoelastoplastic deformation mechanism of electromechanical equipments under the condition of electrocaloric shock. In the coupling model, differentiating from the previous analyzing viewpoint that looked upon deformation work as additional heat source, temperaturefield equation is established by considering the weakening role of deformation work on the intensity of internal heat source; in the process of setting up displacement-field equation, G-derivative of nonlinear functional is introduced into the traditional theory of elastoplastic finite deformation to simplify the expression of structural stiffness; stress-field equation is constructed by using the least square method to improve the stress solution obtained by constitutive equation. The presented model is converted into finite element program to simulate deforming process of 3-D structures with temperature-dependent material properties.As an example, thermal deformation analysis of Shanghai metro cars' brake resistor is performed and compared with experimental results for illustrating the validity of the presented model.

作 者： YU Jian-guo L(U) Chen-liang YE Qing-tai   作者單位： 640th Institute, School of Mechanical Engineering, Shanghai Jiaotong University, Shanghai 200030  刊 名： 東華大學(xué)學(xué)報(bào)（英文版）  EI 英文刊名： JOURNAL OF DONGHUA UNIVERSITY(ENGLISH EDITION)  年，卷(期)： 2006 23(1)  分類號(hào)： O6  關(guān)鍵詞： electromechanical equipments   electrocaloric shock   thermomechanical coupling   finite element analysis