レーザーを用いた球の熱応力焦点化現象の実験的検証

抄録

When an isotropic solid sphere is suddenly subjected to an instantaneous heat source, a stress wave occurs at the moment thermal impact is applied. The stress wave proceeds radially inward to the center of a sphere. The wave may accumulate at the center and give rise to very large stress magnitudes, even though the initial thermal stress is relatively small. This phenomenon is called the stress-focusing effect. In this study, we certify to the stress-focusing effect in a glass solid sphere by using a Nd : YAG pulse laser. We compare the experimental results with the theoretical values and show the mechanism of stress-focusing effect in a solid sphere.