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一、前言 目前,断裂力学的理论和实验技术已经较好地解决了穿透性裂纹试样的断裂问题,并在失效分析和工程设计中获得较好的应用。然而,在工程中多数低应力脆断都由非穿透型的表面裂纹失稳扩展所引起。因此,对于表面裂纹断裂韧性的研究和测试更具有实际意义。 35CrMnSiA钢在兵器工业中有着广泛的应用。然而,有关该钢断裂韧性的研究,尤其是表面裂纹断裂韧性的研究甚少。在实际生产中,有些产品往往只强调强度而忽略了
I. Introduction At present, the theory and experimental techniques of fracture mechanics have solved the problem of fracture of penetrating crack specimens well and have been well applied in failure analysis and engineering design. However, most of the low-stress brittle fractures in engineering are caused by the instability propagation of non-penetrating surface cracks. Therefore, it is more practical to research and test the fracture toughness of surface cracks. 35CrMnSiA steel in the weapons industry has a wide range of applications. However, little is known about the fracture toughness of the steel, especially the fracture toughness of surface cracks. In actual production, some products tend to emphasize the strength and neglect