结构材料的脆性断裂总是由宏观尺寸的裂纹快速扩张引起的。只有承认裂纹存在,而去研究防止裂纹快速扩张的方法,才能有效地防止脆性破坏。断裂力学就是从这观点出发,着重研究裂纹扩张的条件和规律。因而和传统的韧性方法有根本区别。 由于脆性破坏是在低于屈服应力的弹性状态下发生的,因而把材料看成线弹性体而 Brittle fracture of structural materials is always caused by the rapid expansion of macro-scale cracks. Only recognized the existence of cracks, and to study the prevention of rapid expansion of the crack method, in order to effectively prevent brittle failure. Fracture mechanics is from this point of view, focusing on the conditions and laws of crack expansion. There is a fundamental difference from the traditional method of resilience. As the brittle failure occurs below the yield point of elasticity, the material is considered as a linear elastomer