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根据矩张量理论构建了细观尺度上巴西劈裂试验声发射的细观模拟方法.通过试验和计算结果的对比分析,验证了该方法的合理性.该方法可同时给出声发射事件发生的时间、空间、破裂强度等特征,再现试样破裂空间演化规律.研究发现:在达到峰值抗拉强度之前,声发射事件比率和破裂强度较低;在峰值和残余抗拉强度之间,声发射事件比率和破裂强度均较高.声发射事件比率随破裂强度变化近似呈极值分布;在均值至最大破裂强度之间,声发射事件累积比率随破裂强度的降低近似呈指数函数增加.每次声发射事件所包含的微破裂数,随破裂强度的提高而增加,近似呈指数函数关系;声发射事件比率与微破裂数近似呈负指数函数关系.
According to the theory of moment tensor, a mesoscopic simulation method for acoustic emission from Brazilian cleavage test at the mesoscale is established. The comparison between the experimental results and the calculated results shows that the proposed method is reasonable. This method can give an acoustic emission event at the same time Time, space, rupture strength and other characteristics of the rupture space to reproduce the rupture of the sample.The study found that: before reaching the peak tensile strength, the acoustic emission event ratio and rupture strength is low; between peak and residual tensile strength, the sound The ratio of acoustic emission events and rupture strength are higher.The ratio of acoustic emission events with rupture strength changes approximately extremum distribution.The cumulative ratio of acoustic emission events increases exponentially with the decrease of rupture strength from the mean value to the maximum rupture strength The number of micro-bursts contained in infrasound emission increased with the increase of rupture strength, which was approximately an exponential function. The ratio of acoustic emission events to micro-bursts was approximately exponential.