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

最近，与用于改进高温性能的复合材料相关的成本、能量和环境节约的潜力很大。对女性生殖器切割等新材料的关注是最近的事态发展。因此，本文研究了波在球形和圆柱形颗粒复合材料中传播的解析方法，当含有球形或圆柱形夹杂的无限大弹性介质突然受到均匀温升时，在热冲击的瞬间，在球形或圆柱形夹杂的界面处产生应力波。夹杂物中的应力波沿径向向内传播到夹杂物的中心。即使初始热应力应该相对较小，波也可能在中心积聚并引起非常大的应力幅值。这种现象被称为应力集中效应。无限介质中的应力波沿径向传播到无限远。本研究分析，在一个精确的方式，这些波的影响，使用射线积分。研究结果清楚地揭示了无限大弹性介质中夹杂应力集中效应的机理。在特殊情况下，当球形或圆柱形夹杂的弹性柔量趋于零时，问题就变成了含球形空腔或圆柱形孔的无限介质中的波动问题。

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.