岩石动态拉伸断裂特性的实验研究

采用新近发展起来的拉伸式Ｈｏｐｋｉｎｓｏｎ冲击装置（ＳＨＴＢ），对岩石切口圆柱断裂试样进行了动态拉伸断裂特性的实验研究。同时，利用ＭＴＳ试验机进行了岩石的静态拉伸断裂实验，成功地获得了岩石试样的断裂韧度及断裂能随加载率而变化的实验结果。对静态和动态破坏后的试样断口进行的扫描电镜观察进一步表明，试样断口形貌的复杂程度与其断裂耗能有着十分密切的联系。

Experiment Study of Rock Fracture under Dynamic Tension

Using the newly developed tensile impact setup called split Hopkinson bar (SHTB), the dynamic tensile fracture tests of a round rock specimen with a kerf were carried out, and the results of the static tensile fracture were obtained with the material testing system (MTS). The test results showing that the values of fracture toughness and fracture energy change with loading rates were gained successfully. Based on the observations by scanning electronic microsope to both dynamically and statically fractured specimens, it shows that the complexity of the shape of fracture plane is closely related to fracture energy.