冲击速度对冻土冲击韧度的影响

Effect of Pendulum Speed on Impact Toughness of Frozen Soil

为研究不同冲击速度条件下冻土冲击韧度的变化特性，以及冻土在高应变速率下的强度特性，采用传统冲击试验机对冻结兰州黄土、兰州中砂和纯冰进行了不同冲击速度、不同温度条件下有缺口冲击试验研究。试验结果发现裂纹在试样中扩展所需能量随速度的增加而增加，并与试验样品种类密切相关。随着温度降低和锤速的增加，试样冲击韧度的敏感性也随之加大。

In order to understand the properties of impact toughness of frozen soil with different impact speeds, and the strength of frozen soil under high strain rates, a series of notched Charpy bar impact tests are conducted on frozen Lanzhou loess, Lanzhou sand, and pure ice with different impact speeds and temperatures. The test results show that the expanding energy of fracture in samples increases with its expanding speed, and that the amount has close relation with the testing material. The sensitive degree of the impact toughness increases with the decreasing temperature and increasing pendulum speed. The effect of pendulum speed is more sensitive than that of the temperature within the range of pendulum speeds and temperatures tested.