功能梯度复合材料板壳结构的弯曲、屈曲和振动

功能梯度材料通常是由两种如金属和陶瓷复合而成的一种新型非均匀复合材料.由于在这种材料中,各组份材料的体积含量在空间位置上是连续变化的,其物理性能没有突变,因而可较好地避免诸如在纤维增强复合材料中经常出现的层间应力问题或降低应力集中现象.功能梯度复合材料目前已被发展用来作高温环境下的结构构件.本文对功能梯度材料板壳结构分析的研究现状进行了评述, 集中讨论线性和非线性弯曲、屈曲和后屈曲、振动和动力响应.涉及各种边界条件下薄板壳和中厚板壳受热/机荷载作用的情况,并提出需要进一步研究的方向.图0参82

BENDING, BUCKLING AND VIBRATION OF FUNCTIONALLY GRADED PLATES AND SHELLS

Functionally graded materials (FGMs) are microscopically inhomogeneous composites usually made from a mixture of metals and ceramics. By gradually varying the volume fraction of the constituent materials, their material properties exhibit a smooth and continuous change with respect to the spatial location, thus void of interface problems that are usually associated with fibre-reinforced composites and with less severe thermal stress concentrations. FGMs are now developed for general use as structural components in extremely high temperature environments. This article reviews recent investigations concerning the responses of functionally graded plates and shells. The discussion focuses on three major topics: (1) linear and nonlinear bending; (2) buckling and postbuckling; (3) free and forced vibration. Considerations are given both to thin and moderately thick plates and shells having various boundary conditions and subjected to mechanical and/or thermal loadings. Future research needs are highlighted.