Study on dynamic characteristics of red sandstone under cyclic impact

Abstract

In order to study the dynamic characteristics of red sandstone under cyclic impact, the cyclic impact test of red sandstone at the same incident velocity was carried out by E-SHPB test device. Through the analysis and summary of the test data, the influence of cyclic loading times on the dynamic compressive strength of red sandstone and the failure process of red sandstone under the impact of 1000v loading voltage are discussed. The test results show that under the impact of 1000v loading voltage, the peak stress of the specimen decreases linearly with the increase of the number of impacts. The dynamic compressive strength of the specimen under the fifth cyclic impact loading is about 9MPa lower than that under the first impact, and the resistance to deformation is weakened. With the increase of the number of impacts, the cracks in the specimen are continuously generated and expanded, and the specimen is mainly split failure.