A Study of Crack Propagation Paths in Functionally Graded Material Plates

功能梯度材料板裂纹扩展路径的研究

基本信息

批准号：
10650080
负责人：
NODA Naotake
金额：
$ 2.05万
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：
1998
资助国家：
日本
起止时间：
1998 至 2000
项目状态：
已结题

来源：
https://kaken.nii.ac.jp/grant/KAKENHI-PROJECT-10650080/
关键词：
Crack propagation paths Thermal stresses Functionally gradient material plates Fracture mechanics stress intensity factor Finite element method Unsteady state Cracks 弾性熱衝撃き裂伝播亀裂伝播

项目摘要

This research project consists of two parts : [1] Study of thermal stress intensity factors in the functionally graded material plates (FGPs) with cracks under thermal load, [2] A study of crack propagation paths in FGPs under thermal load by Finite Element Methods (FEM).PART [1] : Study of constitutional equations of the functionally graded materials (FGMs) under thermal loading.(1) We proposed a laminated composite model to study FGMs with arbitrary compositional profile subjected to thermal loading.(2) Multiple crack problems could be treated by the proposed a laminated composite model.(3) When FGPs with collinear crack are subjected thermal loading, stress intensity factor at an inner edge of collinear crack is larger than one at outer edge and increases with decreasing the distance of each crack.PART [2] : A study of crack propagation paths in FGPs under thermal load by Finite Element Methods (FEM).(1) We could develop a program with automatically production of mesh of FEM.(2) For the single crack growth simulation, the straight or curved cracks are obtained for several conditions of the thermal shock and the compositional profiles. Some cracks curve sharply and grow in the direction parallel to the surface. Such cracks cause delamination of the surface. The other cracks are arrested in the middle of the plate.(3) As two crack growths is one of the basic forms of the multiple thermal cracking, the interaction between the two cracks are discussed. The cracks grow in curve and away from each other, when the cracks exist in short distance. For spalling cracks that come close to each other from a long distance, the cracks curve in the direction normal to the surface as the crack tips come closer. Then the cracks are arrested in the middle of the plate.

该研究项目由两个部分组成：[1]在热负荷下进行裂纹的热应力强度因子（FGPS）研究，[2] [2]研究FGPS在有限元方法中FGPS中FGPS的裂纹传播路径的研究（part [1] [1]：part [1] [1]：在功能逐渐渐变的材料（FGMS的构造材料）的研究（FGMS的构成材料）（FGMS的构成量）（FGMS的构图）（FGMS）层（fgms）层（fgms）层（1）（1）（1）（1）（1）（1）（1）（1）。（2）提议的层压复合模型可以治疗具有任意组成曲线的FGM。（2）多个裂纹问题可以治疗。（3）当具有共线裂纹的FGP受到热载的压力，在分线裂纹的内部边缘处的压力强度会在外边缘的内部裂缝中大于一个裂缝的距离下降，并增加裂缝的距离。有限元方法（FEM）。（1）我们可以开发一个程序，并自动生产fem的网格（2），对于单个裂纹生长模拟，在热休克和组成曲线的几种条件下获得了直裂裂纹。有些裂纹曲线急剧曲线，并沿平行于表面的方向生长。这样的裂纹会导致表面分层。（3）由于两个裂纹的生长是多重热裂纹的基本形式之一（3）讨论了两个裂纹之间的相互作用。当裂缝在短距离内存在时，裂缝在弯曲中彼此远离。对于从长距离彼此接近的裂纹裂纹，随着裂纹尖端越来越近，裂纹曲线沿正常的方向弯曲。然后将裂缝逮捕在盘子中间。