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近二十多年来,线弹性断裂力学无论在理论和测试技术方面都已得到比较成熟的发展,并在高强材料脆性破坏、疲劳和应力腐蚀等方面得到广泛的应用。但工业结构大量应用的中低强钢,具有较高的断裂韧性,这类构件在迅速断裂之前,已有相当大的塑性区,其尺寸和裂纹长度的数量级相同,发生所谓大范围屈服或全面屈服的情况,对于这类问题的断裂安全分析,既使引入塑性区修正,线性弹性断裂力学也不再适用。因此,要研究弹塑性断裂力学,研究在大范围屈服
For more than two decades, linear elastic fracture mechanics has been developed in both theory and testing technology, and has been widely used in high-strength materials such as brittle fracture, fatigue, and stress corrosion. However, the medium and low-strength steels used in a large number of industrial structures have high fracture toughness. Such components have a considerable plastic zone before their rapid fracture. Their size and crack length are of the same order of magnitude, and so-called wide-range yield or full-scale occurs. In the case of yielding, for the fracture safety analysis of such problems, linear elastic fracture mechanics is no longer applicable even if the plastic zone correction is introduced. Therefore, to study the elasto-plastic fracture mechanics, study the yield in a large range