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本实验用双扭技术测量了济南辉长岩的断裂韧性.在“干”、“湿”及垂直向位移恒定的条件下,用双扭松弛方法测定裂纹的扩展速度 V.得到了与 Atkinson 类似的结果.济南辉长岩的断裂韧性为:K_(IC)=2.81±0.03MNm-(3/2).本文提出了 Spetzler 和 Atkinson 关于在“湿”条件下亚临界裂纹扩展机制的不同看法.由声发射的实验结果看出,声发射率与应力强度因子的关系呈现了与 K_1—V 曲线类似的趋势.
In this experiment, the fracture toughness of the gabbro in Jinan was measured by the double torsion technique, and the crack propagation velocity was measured by the double torsion relaxation method under the conditions of “dry”, “wet” and constant displacement in the vertical direction. .The fracture toughness of Jinan gabbro is: K IC = 2.81 ± 0.03MNm- (3/2) In this paper, we present the different views of Spetzler and Atkinson on the mechanism of subcritical crack propagation under “wet” conditions. From the experimental results of acoustic emission, it can be seen that the relationship between acoustic emissivity and stress intensity factor shows a similar tendency as K_1-V curve.