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利用中南大学SHPB试验系统,对冬瓜山铜矿深部采集的大理岩进行了动态劈裂实验。结合高速摄影技术和在试样上粘贴一系列的应变片开展动态劈裂时试样裂纹起裂及扩展研究。结果显示,高速摄影可以清晰地看出试样的破坏全过程,简便直观。应变片可以记录加载直径上各点的应变时程曲线,从应变曲线上可以看出,试样的破坏并不一定从中心开始,当试样存在损伤或是弱面时,可能从损伤的部分开始起裂。裂纹扩展的速率大约是其P波波速的一半左右。高速摄影可以清楚地看出试样的整个破坏过程,但是成本较高,不能直接得到加载直径上各点的应变历程和破坏时间。在试样上粘贴一系列的应变片简单易行,成本较低,而且可以捕捉试样上各点的应变历程和破坏时间。
Using the SHPB test system of Central South University, the dynamic cleavage experiment was carried out on the marble collected from deep in Dongguashan Copper Mine. Combining with high-speed photography and pasting a series of strain gauges on the specimen, the crack initiation and propagation of the specimen during dynamic splitting were investigated. The results show that high-speed photography can clearly see the entire destruction of the sample process, simple and intuitive. Strain gauge can record the strain curve of strain at each point of loading diameter. It can be seen from the strain curve that the damage of specimen does not necessarily start from the center. When the specimen has damage or weakness, Begin to crack. The rate of crack propagation is about half the P wave velocity. High-speed photography can clearly see the entire destruction of the sample process, but the cost is high, can not be directly obtained on the loading diameter of the strain history and failure time. Paste in the sample a series of strain gauge is simple, low cost, and can capture the specimen strain history and destruction time.