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总览 评价 聂国隽 * ( 航空航天与力学学院,同济大学; ) 摘要: 本文研究了功能梯度材料圆筒的微结构优化设计。假设功能梯度材料的体积分数沿圆筒的径向变化,其有效材料参数由Mori-Tanaka方法估计。对于非轴对称载荷作用下的功能梯度材料圆筒,以环向应
聂国隽*
(
航空航天与力学学院,同济大学; )
摘要:
本文研究了功能梯度材料圆筒的微结构优化设计。假设功能梯度材料的体积分数沿圆筒的径向变化,其有效材料参数由Mori-Tanaka方法估计。对于非轴对称载荷作用下的功能梯度材料圆筒,以环向应力沿径向均匀分布而沿环向周期分布为设计目标,确定了各组分材料的体积分数沿径向的变化规律。研究表明,为消除圆筒内壁的应力集中,各组分材料的体积分数沿径向的变化与所施加的非对称载荷的环向波数有关。本文给出的功能梯度材料圆筒优化设计的结果可供结构工程师参考。
关键词:
固体力学;优化设计;圆筒;体积分数;功能梯度材料
NIE Guojun*
(
School of Aerospace Engineering and Applied Mechanics, Tongji University; )
Abstract:
Optimal design of hollow cylinders composed of linear elastic functionally graded materials (FGMs) is carried out in this paper. The volume fractions of two phases of FGMs are assumed to vary only with the radius and the effective material properties are estimated by using the Mori-Tanaka scheme. For a FGMs cylinder under non-axisymmetric loads the variation of the volume fraction of the two phases is determined for the hoop stress to be constant through the thickness but have the same periodicity in the circumferential direction as the applied load. It is found that the optimal radial distribution of the volume fractions of the phases depends on the circumferential wave number of the applied loads. The results of optimal design for hollow cylinders under asymmetric loads should be helpful for structural engineers.
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