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断裂力学用于工程技术,进行构件的安全性分析越来越广泛了。要对带缺陷构件进行安全性分析及寿命估计,除了要有准确的裂缝原始尺寸、裂纹疲劳扩展速率、裂纹尖端的受力情况等数据外,构件材料(或焊缝金属、热影响区)的断裂韧性值,是最重要的一个参量。因此,准确地测定材料的断裂韧性值,在断裂力学分析中占很重要的地位。在测定材料断裂韧性值过程中,不论哪一种指标——K_(1C)也好,COD(即SC)或J_(1C)也好,均需在函数记录仪上画出力(P)——位移(V)的关系曲线,
Fracture mechanics is used in engineering technology and the safety analysis of components is more and more extensive. In order to analyze the safety and life expectancy of a member with a defect, except for the data such as the original crack size, the fatigue crack growth rate and the crack tip force, the material of the component (or the weld metal and the heat affected zone) Fracture toughness value is the most important parameter. Therefore, the accurate determination of the fracture toughness of materials, fracture mechanics analysis occupies a very important position. In the determination of material fracture toughness value, no matter what kind of indicators - K_ (1C) Ye Hao, COD (ie SC) or J_ (1C) Ye Hao, were required to plot the force recorder (P) Displacement (V) of the relationship curve,