Investigation of Thermal Stress-Focusing Effect Caused by Phase Transformation and Development of Properties in the Particulate Composite Materials Caused by the Thermal Shock

1.复合材料相变引起的热应力集中效应研究已有多项工作研究了相变增韧陶瓷在瞬时相变作用下的弹性动力学响应。一些复合材料，如氧化锆增韧陶瓷，是一种性能优异的材料，它具有高强度、高弹性模数、改善韧性等特点，具有许多陶瓷复合材料的共同优点。这些优良的性质是通过复合粒子的相变而实现的。相变增韧利用了颗粒的应力诱导相变，并伴随着体积膨胀。在这项研究中，提出了一个唯象模型来描述这种情况，它涉及到嵌入在无限大弹性矩阵中的球形粒子的动态相变。2.由…引起的颗粒复合材料性能的发展在这项研究中，我们利用射线积分，精确地解决了无限大介质中球形夹杂中热应力聚焦效应的影响。分析了无限域中球状氧化锆包裹体中瞬时相变引起的应力集中效应。利用射线理论，数值结果清楚地揭示了无限大弹性介质中夹杂的应力聚焦效应的机理。3.利用激光对球形夹杂的Stiss聚焦效应进行实验研究当含有球形夹杂的无限大弹性介质突然受到瞬时相变时，在施加瞬时相变应变的情况下，球状夹杂表面会产生应力波。波可能在中心聚集，表现出应力集中效应。实验研究了利用激光入射加热球形夹杂物的应力聚焦效应。较少

1.Investigation of Thermal Stress-Focusing Effect Caused by Phase Transformation in Composite MaterialsThe elastodynamic response of the transformation-toughened ceramics under an instantaneous phase transformation has been investigated in several works. Some composite materials, such as Zirconia toughened ceramics, are remarkable material, which has a high strength, a high elastic modulus, and an improved toughness, etc. Most of the good qualities are common in many ceramic composite materials. These good qualities are made possible through the phase transformation of composite particles. The transformation toughening utilizes the stress-induced phase transformation of particles, which is accompanied by a volumetric expansion. In this study a phenomenological model is proposed to describe the situation, which involves a dynamic phase transformation in a spherical particle embedded in the infinite elastic matrix.2.Development of Properties in the Particulate Composite Materials Caused … More by the Thermal ShockIn this investigation we solve, in an exact manner, the effects of the thermal stress-focusing effect in a spherical inclusion embedded in an infinite medium by using the ray integrals. This investigation analyzes the stress-focusing effect caused by the instantaneous phase transformation in the spherical inclusion of Zirconia embedded in the infinite domain. By using the ray theory, the numerical results give a clear indication of the mechanism of stress-focusing effect in an inclusion embedded in the infinite elastic medium.3.Experimental Study of Stiss-Focusing Effect in a Spherical Inclusion by using YAG LaserWhen an infinite elastic medium with a spherical inclusion is suddenly subjected to an instantaneous phase transformation, stress waves occur at the surface of spherical inclusion the moment instantaneous transformation strains are applied. The wave may accumulate at the center and show the stress-focusing effects. The experimental study is the stress-focusing effect one in a spherical inclusion by using the impact heating of YAG Laser. Less