Analysis of Mechanical Damage Properties of Fractured Red Sandstone Under Impact Loading Based on Peridynamics Theory
Indoor experiments and near-field kinetic theory were used to study the effects of the length,inclination angle and number of cracks on the crack extension of semicircular disk red sandstone under impact loading,and to investigate the dynamic damage process of sandstones with different lengths(0 mm,10 mm,15 mm,20 mm),inclinations(30°,45°,60°,90°)and numbers of prefabricated cracks under impact loading,so as to obtain the whole process of crack initiation,expansion and merging under impact loading.The results show that the failure of 0,10,15 and 20 mm prefabricated cleavage specimens is caused by longitudinal cracks,and each crack is fractured along the direction of the cleavage;the 30° and 45° inclined cleavage specimens produce secondary cleavage in the middle of prefabricated cleavage,and the prefabricated cleavage tips of the 60° and 90° inclined cleavage specimens produce opposite winged cleavage.The fracture length has no effect on the generation of longitudinal splitting cracks;the change of fracture inclination will affect the morphology and location of cracks sprouted from prefabricated cracks;the numerical simulation results match well with the results of the indoor experiments,which indicate that the near-field kinetic theory can simulate the crack initiation,extension and merger of red sandstone to a certain extent.
NETL
NSTL
万方数据
