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中文摘要：
利用直径100mm的Hopkinson压杆和薄圆形铝片作为波形整形器，用不同弹速径向冲击平台巴西圆盘试样以研究大理岩的动态拉伸强度。分析了试样的应变率、破坏时间、破坏模式，以及破坏过程中的载荷-应变关系，得到了关于大理岩在高应变率下拉伸强度及弹性模量的一些结论。考虑了试样的尺寸大小及两个平台附近应力的时间不均匀性与空间不均匀性对实验结果的影响。同时，利用有限元法对平台巴西圆盘试样的动态应力分布进行了数值模拟，验证了动态劈裂拉伸实验的有效性。
英文摘要：
In order to investigate the dynamic tension strength of rocks, the flattened Brazilian disc specimens were subjected to diametral impact with different projectile speeds by using the split Hopkinson pressure bar （SHPB） of 100 mm in diameter where a thin aluminum circular plate was used as a pulse shaper. The strain rate, failure time, failure pattern and the relationship between load and strain during the failure process have been analyzed to get some conclusions about the tensile strength and the elastic modulus of marble at high strain rates. The influence of stress nonuniformities near two flattened ends of specimens on test results was taken into account. Meanwhile, the validity of dynamic split tension tests has been confirmed by the numerical simulation of the dynamic stress distribution in flattened Brazilian disc specimens using the finite element technique.
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