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

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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