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断裂韧度K_(Ic)是材料抵抗裂纹失稳扩展能力的度量,是材料抵抗低应力脆性破坏的韧性参数。它的大小不仅与材料的力学性能(如弹性模量E、屈服强度σ_(vs)等)有关,而且还与材料的微观结构及断裂机理有关。近些年来,国内外都比较重视用宏观与微观相结合的观点研究断裂问题。人们试图在进行断裂力学试样断口金相分析的基础上,建立断裂韧度K_(Ic)与材料的宏观力学性能以及断口参数间的相互关系,以便把
The fracture toughness K_ (Ic) is a measure of the material’s ability to resist crack propagation and is the toughness parameter of the material against low-stress brittle failure. Its size is not only related to the mechanical properties of the material (such as elastic modulus E, yield strength σ vs, etc.), but also related to the microstructure and fracture mechanism of the material. In recent years, both at home and abroad have paid more attention to the problem of fracture by using the combination of macro and micro. People tried to establish the fracture toughness K_ (Ic) and macroscopic mechanical properties of the material and the relationship between the fracture parameters based on the fracture analysis of fracture fracture metallographic analysis, in order to