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论文类型：期刊论文

发表时间：2022-06-29

发表刊物：复合材料学报

所属单位：运载工程与力学学部

期号：1

页面范围：152-157

ISSN号：1000-3851

摘要：Based on the homogenization theory, the multi-scale analysis methods of the viscoelastic property, and the effective thermal stress relaxation laws are studied. By defining the concepts, the effective thermal stress relaxation modulus (ETSRM) and the effective time-dependent coefficients of thermal expansion (ETCTE), the thermal viscoelastic constitutive equation is expressed in the same form as that of conventional materials. Besides, a homogenization-based method for predicting the effective viscoelastic relaxation modulus, ETSRM and ETCET is given. It is pointed out that, for viscoelastic composite materials, the thermal expansion coefficients are time-dependent, and the thermal expansion process can not be completed instantaneously, exhibiting an obvious time-delay effect. The analysis of several kinds of special composite materials shows that: (1) The thermal expansion of porous material has an instantaneous character, its ETCTE is the same as that of the matrix material which is time-independent, and its thermal stress relaxation law is also the same as that of the matrix material; (2) For a special kind of composite materials of which the relaxation moduli of all the components can be expressed as the products of different individual time-independent coefficients and a same time-dependent function, the effective time-dependent thermal expansion coefficient is time-independent, and the character of the relaxation laws is the same as that of conventional materials.

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