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Theoretical Developments of Thermal Stress Relaxation Effect for Nonhomogeneous Composite Materials Under the Extremely High Temperature Environment

极高温环境下非均质复合材料热应力松弛效应的理论进展

基本信息

批准号：
01550076
负责人：
TANIGAWA Yoshinobu
金额：
$ 1.28万
依托单位：
University of Osaka Prefecture
依托单位国家：
日本
项目类别：
Grant-in-Aid for General Scientific Research (C)
财政年份：
1989
资助国家：
日本
起止时间：
1989 至 1990
项目状态：
已结题

项目摘要

In this research project, thermal stress problems for the Metal Matrix Composites and the Functionally Gradient Materials are treated theoretically for the several analytical models. The FGMs are composed of the light metals and the engineering ceramics, and now attracts our engineering attention by the effect of thermally induced stress relaxation. Then, the following four problems are dealt with theoretically in the present research.1. Transient thermal stress and thermal deformation analysis for the laminated composite materials. In this research, thermal stress distributions and thermal deformations of the infinitely long laminated slab are evaluated under the condition that the slab is composed of orthotropic materials of angle-ply or cross-ply laminate.2. Transient thermal stress analysis of nonhomogeneous materials for the several analytical models. In this research, taking into account the nonhomogeneity of the material properties is to be one-dimensional, transient thermal stress problems are dealt with for several analytical models such as infinitely long slab, beam, rectangular plate, hollow cylinder and spherical shell.3. Inverse problems of thermal deformation for the nonhomogeneous materials under the transient heat conditions.In this research, as one of the inverse analysis of thermally induced elastic problem, axisymmetric inverse problem of a solid cylinder and a solid sphere with nonhomogeneous material properties are discussed. The outline of the analytical process is to determine the unknown heat flux distribution from the prescribed thermal deformation.4. Nonlinear thermally induced behaviors for the nonhomogeneous materials under the transient state. In this research, thermal buckling problems of a beam and a rectangular plate with nonhomogeneous material properties are analyzed making use of the energy method.

在本研究项目中，对金属基复合材料和功能梯度材料的热应力问题进行了理论分析。功能梯度材料由轻金属和工程陶瓷组成，由于其热致应力松弛效应引起了人们的广泛关注。然后，本研究从理论上对以下四个问题进行了探讨。复合材料层合板的瞬时热应力和热变形分析。本文的主要研究内容如下：1.研究了无限长层合板由角板和交板两种材料组成的情况下的热应力分布和热变形。对几种分析模型进行了非均匀材料的瞬时热应力分析。在本研究中，考虑到材料性质的非均质性是一维的，对无限长板、梁、矩形板、空心圆柱体和球壳等几种分析模型的瞬时热应力问题进行了研究。非均匀材料在瞬变热条件下的热变形反问题作为热致弹性问题反分析的一种，本文讨论了具有非均匀材料性质的实心圆柱体和实心球的轴对称反问题。分析过程的要点是根据规定的热变形确定未知的热流密度分布。非均匀材料在瞬变状态下的非线性热致行为。本文利用能量法分析了具有非均匀材料特性的梁和矩形薄板的热屈曲问题。