Development of Supporting System of Design of the Functionally Graded Materialsand its Constitutional Equations

功能梯度材料及其构成方程设计支撑系统的开发

基本信息

批准号：
06650101
负责人：
NODA Naotake
金额：
$ 1.28万
依托单位：
Shizuoka University
依托单位国家：
日本
项目类别：
Grant-in-Aid for Scientific Research (C)
财政年份：
1994
资助国家：
日本
起止时间：
1994 至 1996
项目状态：
已结题

项目摘要

This research project consists of two parts : [1] Study of constitutional equations of the functionally graded materials (FGMs) under thermal load, [2] Developments of programming system to release the thermal stresses in FGMs with and without a crack by Finite Element Methods (FEM).PART [1] : Study of constitutional equations of the functionally graded materials (FGMs) under thermal load. The functionally graded materials (FGMs) are consisted by compositional components of the ceramics and metals. Then, FGMs can be considered as one of the composite materials which its compositional components dependent on the position. The constitutional equations are proposed for the functionally graded materials taking into consideration of thermal load. The equations are developed by an incremental theory which describes the thermal elasto-plastic behavior and damage behavior of particulate-reinforced composites, based on Eshelby's solution of an ellipsoidal inclusion and Mori-Tanaka's conception … More of average stress-strain for the finite concentration of particles under thermal load.PART [2] : Developments of programming system to release the thermal stresses in FGMs with and without a crack by Finite Element Methods (FEM).(1) We could develop programming system to discuss the thermal stresses in the FGMs by used of the proposed constitutional equations.(2) The stress-strain curves are calculated for the matrix and the particle by used of the proposed constitutional equations. Even if the average stress is zero, large compressible stress occurs in the matrix, but large tensile stress occurs in the particle. The stress-strain curves largely depend on the manufacturing process of the FGMs.(3) From the results of calculation for the time variation of the stress intensity factor of the functionally graded plate with an edge crack under heating-cooling cycle heat supply, we obtained the following results. The region of the large stress intensity factor is restricted within a very thin layr, and length of crack growth is restricted within one time tenth of the thickness of the plate. The optimal composition of the component of FGMs is linear distribution from the ceramics to the metal. Less

该研究项目由两个部分组成：[1]在热负载下功能分级材料（FGM）的宪法方程研究，[2]编程系统的发展，以释放具有有限元方法的FGM的热应力（fem）[1]：PART [1]：在功能分级材料（FGMS）的构成方程（FGMS）研究（FGMS）。功能分级的材料（FGM）通过陶瓷和金属的成分一致。然后，FGM可以被视为其复合材料的复合材料之一，其复合材料取决于位置。在考虑热负载的情况下，提出了用于功能级的材料的构造方程。方程是由一个渐进理论开发的，该理论描述了基于Eshelby对椭圆形包含和Mori-Tanaka的概念的解决方案的热弹性塑性行为和特定形成组成的损伤行为，以及在没有释放的Promantal Parts的有限范围的元素中，更高的平均应力构造元素的平均应力构型。方法（FEM）。（1）我们可以通过使用拟议的宪法方程来开发编程系统来讨论FGM中的热应力。（2）通过使用拟议的宪法方程来计算应力 - 应变曲线的应力 - 应变曲线。即使平均应力为零，在基质中也会发生较大的兼容应力，但是粒子中发生了较大的拉伸应力。应力 - 应变曲线在很大程度上取决于FGMS的制造过程。（3）从计算结果中，功能分级的板的应力强度因子的时间变化，在加热冷却周期热供热下具有边缘裂纹，我们获得了以下结果。较大的应力强度因子的区域受到非常薄的限制，并且裂纹长度在板厚度的十分之内受到限制。 FGMS组件的最佳组成是从陶瓷到金属的线性分布。较少的