一、前言由于近年来断裂力学的发展和结构分析的进步,就能评价在静载状态下钢结构的脆性断裂行为或断裂强度的断裂条件。可是,就原子能、船舶、海洋建筑物以及涡轮壳体等机械构件而言,从它们的重要 I. INTRODUCTION Due to the development of fracture mechanics and structural analysis in recent years, the fracture conditions of brittle fracture behavior or fracture strength of steel structures under static load can be evaluated. However, in terms of mechanical components such as atomic energy, ships, marine structures and turbine housings, their importance