Linear energy storage and dissipation rule of red sandstone materials during the tensile failure process
GONG Fengqiang1，2，3，LUO Song1，LI Xibing1，2，3，YAN Jingyi1
(1. School of Resources and Safety Engineering，Central South University，Changsha，Hunan 410083，China；
2. Hunan Key Laboratory of Resources Exploitation and Hazard Control for Deep Metal Mines，Central South University，Changsha，Hunan 410083，China；3. Center for Advanced Study，Central South University，Changsha，Hunan 410083，China)
Abstract：In order to investigate the energy dissipation characteristics of rock material during the tensile failure process，a series of single loading-unloading tests including Brazil split test，point load test and three point bending fracture test(semi-circular bend，SCB) were conducted to red sandstone on the testing system MTS 322 and MTS Landmark. The total input energy，elastic energy and dissipated energy under different unloading levels can be obtained with the graphic method of area integration. The relationships of these three energy parameters and its variations with the increasing of unloading levels were also analyzed. The results show that the total input energy，elastic energy and dissipated energy of rock specimens under different unloading levels increase quadratically with the increasing of unloading level. There is a linear relationship between the elastic energy，dissipated energy and total input energy at each unloading level，which is independent of the loading level. The internal elastic energy of rock sample at the peak strength point can be calculated according to this linear function. The energy storage coefficient(the ratio of elastic energy to total input energy during the loading process of rock specimen) is defined according to the linear relation of energy storage.
宫凤强1，2，3，罗 松1，李夕兵1，2，3，闫景一1. 红砂岩张拉破坏过程中的线性储能和耗能规律[J]. 岩石力学与工程学报, 2018, 37(2): 352-363.
GONG Fengqiang1，2，3，LUO Song1，LI Xibing1，2，3，YAN Jingyi1. Linear energy storage and dissipation rule of red sandstone materials during the tensile failure process. , 2018, 37(2): 352-363.
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2018, Vol. 37 
