Experiment Research on Impact Fragmentation Mechanism of Single-indenter under Low Power Condition

Abstract

In this paper, experiment research on rock impact fragmentation with low power consumption had been carried out. These single- indenter impact experiments on marble had completed discovered the single-indenter impact crushing mechanismunderlowimpactenergyof0.42J∼1.88J. Using three-dimension scanning, the impact crushing crater's precise parameters, including shape, depth and volume, were acquired, and the relation curves between specific energy and impact energy were also gained. These experimental results show that the impact crushing crater's shape generally accords with the Sikarskie shear fracture theory, the crater's depth is less than 0.5mm and the crater's volume is less than 0.5mm3 under0.42J∼1.88J low energy impact loadings. The crater's volume and crushed volume are getting large along with impact energy increasing. However, the specific energy value decreases with impact energy increasing for therangeof0.42J∼1.88J, and the specific energy is most economical when the impact energy is around 1.2J, these results could provide a basis for coring bit designing and parameters optimizing of lunar drilling.