Investigation of the Thermal Stress-Focusing Effect in the Particulate Composite Materials Caused by the Thermal Shock

热冲击引起的颗粒复合材料热应力集中效应的研究

基本信息

批准号：
10650081
负责人：
HATA Toshiaki
金额：
$ 2.18万
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 2001
项目状态：
已结题

来源：
https://kaken.nii.ac.jp/grant/KAKENHI-PROJECT-10650081/
关键词：
Elasticity Thermal stresses Stress-Focusing Thermal Shock Composite material Stress Wave 応力焦点化

项目摘要

Recently, the potential for cost, energy, and environmental savings associated with composite materials for improved high-temperature performance is large. Concern about the new materials such as FGM is a recent development. Therefore this research studies the analytical methods for the wave propagation through spherical and cylindrical particulate composites.When an infinite elastic medium with a spherical or cylindrical inclusion is suddenly subjected to a uniform temperature rise, stress waves occur at the interface of spherical or cylindrical inclusion the moment thermal impact is applied. The stress wave in an inclusion proceeds radially inward to the center of the inclusion. The wave may accumulate at the center and cause very large stress magnitudes, even though the initial thermal stress should be relatively small. This phenomenon is called the stress-focusing effect. The stress wave in an infinite medium proceeds radially to infinity. This research analyzes, in an exact manner, the effects of these waves using the ray integrals. The results give a clear indication of the mechanism of stress-focusing effect in an inclusion embedded in the infinite elastic medium. In the special case, if the elastic compliances of the spherical or cylindrical inclusion tend to be zero, the problem becomes the problem of wave motion in the infinite medium with a spherical cavity or cylindrical hole.In this study, the results of investigation of the thermal stress-focusing effect in the particulate Composite Materials are applicable to a wide range of industrial uses.

最近，与改善高温性能的复合材料相关的成本、能源和环境节约潜力巨大。对女性生殖器切割等新材料的关注是最近的发展。因此，本研究研究了波在球形和圆柱形颗粒复合材料中传播的分析方法。当含有球形或圆柱形夹杂物的无限弹性介质突然受到均匀升温时，在球形或圆柱形夹杂物的界面处会产生应力波，施加瞬间热冲击。夹杂物中的应力波径向向内行进至夹杂物的中心。尽管初始热应力应该相对较小，但波可能会在中心积聚并导致非常大的应力大小。这种现象称为压力集中效应。无限介质中的应力波径向传播至无穷大。这项研究使用射线积分以精确的方式分析了这些波的影响。结果清楚地表明了嵌入无限弹性介质中的夹杂物的应力集中效应的机制。在特殊情况下，如果球形或圆柱形夹杂物的弹性柔量趋于零，则问题就变成具有球形空腔或圆柱形孔的无限介质中的波动问题。颗粒复合材料中的热应力集中效应适用于广泛的工业用途。