Impact bending tests of rocks
Abstract
In all real bodies, deformation processes proceed in time. Mechanical characteristics that do not take time into account are approximate and in many cases prove to be inadequate. Factors such as the rate and duration of loading , the energy stored by the system , have a great influence on the value of the breaking stress. In the LGI a lot of work has been done to establish the physical features of the process of rock fracture by impact loading and to find out the comparative efficiency of static and dynamic methods of fracture. As a result, it was found that the fracture energy, other things being equal, is a function of the impact energy, the rate of impact load application, and the mass of the impacting body. As for the comparison of energy expenditure in static and impact tests, it is permissible only at a comparable degree of crushing, i.e. at some minimum impact work.
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