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发表时间：2005-01-01

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：126-132

ISSN号：1000-3851

摘要：Materials with zero thermal expansion coefficients benefit to improve the geometrical stabilities of aeronautic and astronautic structures and electric equipment under great temperature changes. The microstructure of materials with zero thermal expansion coefficients is designed using a topology optimization method which consists of finding the distribution of three material phases in the design domain. These material phases include two different material phases and a void phase. The effective properties of material structures are determined using the numerical homogenization method based on a finite-element discretization of the base cell, and the optimization problem is solved with the feasible direction method. The dependence on initial design is investigated, and some possible reasons causing the problem are discussed. The thermal expansion behavior of the material with designed microstructure is tested by numerically simulated experiments, while the thermal expansion coefficients are obtained through analyzing the deformation of the materials caused by temperature change. These numerically simulated experiments verified the characteristic of zero (low) thermal expansion behavior of the designed material, which shows that the topology optimization method is a valid and effective method for microstructure design of materials with zero thermal expansion coefficients.

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