论文部分内容阅读
本文确定了表面裂纹的热应力加强因子。一块有边界裂纹的半无限大平板,如果对它的有裂纹的板边加热,就会产生瞬间热应力,在裂纹尖端附近就有动态应力加强因子。本研究四块半无限大的平板,分别具有不同倾斜角度的边界裂纹。一个图象数值处理分析系统在全应力场上收集收据,并用 Williams 方程来计算应力加强因子。根据所得的应力加强因子再现相应的光弹干涉条纹图形,并把它叠加到原光弹图形上进行比较,从而确定所得应力加强因子的正确性。文章描述了实验方法,对真实图形和再现图形作了比较,提出了有关热应力加强因子的实验值。
This article identifies the thermal stress enhancing factors for surface cracks. A semi-infinite slab with a boundary crack will generate transient thermal stress if it is heated against its cracked edge, and there will be a dynamic stress enhancement factor near the crack tip. In this study, four and a half infinity slabs have boundary cracks with different inclination angles. An image data processing and analysis system collects receipts on the full stress field and uses the Williams equation to calculate stress enhancing factors. According to the obtained stress enhancement factor, the corresponding photoelastic interference fringe pattern is reproduced and superimposed on the original photoelastic pattern for comparison, thereby confirming the correctness of the obtained stress enhancement factor. The article describes the experimental method, and compares the real figure with the reproduced figure, and proposes the experimental value of the thermal stress enhancing factor.