The study of crack propagation behavior in functionally graded plate due to thermal load

热载荷作用下功能梯度板裂纹扩展行为研究

基本信息

批准号：
14550072
负责人：
NODA Naotake
金额：
$ 1.86万
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：
2002
资助国家：
日本
起止时间：
2002 至 2005
项目状态：
已结题

来源：
https://kaken.nii.ac.jp/grant/KAKENHI-PROJECT-14550072/
关键词：
Elasticity Thermal Stresses Functionally graded material Thermal shock Fracture mechanics Crack propagation path Finite element Method

项目摘要

This Research project consists of two parts : [1]the crack generation patterns in the functionally graded plate (FGP) under thermal shock, and [2]the crack propagation patterns in the FGP under thermal shock.[1]the crack generation patterns in the functionally graded plate (FGP) under thermal shockWe could obtain following results by numerical simulations. (1)The thermal stresses can be released in the region near the crack. (2)Since the thermal stresses on the boundary surface far away from the crack uniformly increase with time, the position where a crack initiates cannot be determined. However, minimum crack space can be determined.[2]the crack propagation patterns in the functionally graded plate (FGP) under thermal shock(1)We could analyze the thermal stresses problems in the FGP with a Griffith crack. However we are studying the thermal stresses problems in the FGP with two Griffith cracks. It is very difficult to solve the FGP with two cracks due to non-homogeneous material prop … More erties.(2)Case A : Cracks propagation patterns in the FGP with two initial cracks.(1)There are four cracks propagation patterns : 1)The crack propagate straightly along the thickness and arrests at the certain position, 2)Two cracks curve with opposite direction going away for each other, 3)Two cracks curve with opposite direction approaching for each other, 4) Two cracks curve with same direction.(2)The delamination depth in the case of two cracks is shorter than that of a single crack.(3)The space between the cracks, heating temperature and composition profile of the FGP largely affect the crack propagation direction.(4)When each crack approaches for each other, each crack does not contact and turns along the thickness.(5)When each crack curves with same direction, the latter crack propagates by avoiding the former crack.(3)Case B : Cracks propagation patterns in the FGP having three initial cracks with same length.(1)The middle crack propagates straightly and arrests at certain position.(2)The behavior of the crack propagation patterns of the outer cracks is about same as two crack propagation pattern.(3)Each crack does not contact. Less

该研究项目由两部分组成：[1]热冲击下功能梯度板（FGP）中的裂纹生成模式，以及[2]热冲击下FGP中的裂纹扩展模式。[1]热冲击下功能梯度板（FGP）中的裂纹生成模式热冲击下的功能梯度板（FGP）通过数值模拟可以得到以下结果（1）热应力可以在靠近裂纹的区域释放（2）由于远离裂纹的边界面上的热应力。随时间均匀增加，裂纹萌生的位置无法确定，但是可以确定最小裂纹空间。[2]热冲击下功能梯度板（FGP）中的裂纹扩展模式（1）我们可以分析 FGP 中的热应力问题。然而，我们正在研究具有两个格里菲斯裂纹的 FGP 中的热应力问题，由于非均匀材料特性，解决具有两个裂纹的 FGP 非常困难。(2)案例 A：裂纹。具有两个初始裂纹的 FGP 中的扩展模式。(1) 裂纹扩展模式有四种： 1) 裂纹沿厚度直线扩展并停在某个位置， 2) 两条裂纹曲线方向相反，相互远离， 3）两条裂纹曲线方向相反，相互接近；4）两条裂纹曲线方向相同；（2）两条裂纹时的分层深度比单条裂纹时的分层深度短。（3）裂纹之间的空间、加热温度和FGP的成分分布在很大程度上影响裂纹扩展方向。(4)当每个裂纹相互接近时，每个裂纹不接触并沿厚度方向转向。(5)当每个裂纹弯曲时(3)情况 B：具有三个长度相同的初始裂纹的 FGP 中的裂纹扩展模式。(1)中间裂纹直线扩展并停在某个位置。(2)这外部裂纹的裂纹扩展模式与两个裂纹扩展模式大致相同。(3)各裂纹不接触。