DYNAMIC SHEAR PROPERTIES OF STEEL FIBER REINFORCED CEMENT UNDER COMBINED PRESSURE AND SHEAR IMPACT LOADING

Based on the shear wave tracing technique(SWT)proposed by Tang ZP,series of experiments,which includes oblique planar impact with inclination angles of 0~20 degree and impact loading velocity ranging from 40m/s to 270m/s are carried out in the present paper to investigate the responses of steel fiber reinforced cement(SFCEM)subject to impact loading.Experimental results show that the material is at the stage of damage or the transition stage from damage to void collapse under these impact velocities.Compared with the experimental results of Polypropylene micro-fiber reinforced cement(FCEM),conclusion can be drawn that the transversal wave velocity of the composites with 0.5 percent in volume of steel fiber is evidently increased,but not the compression resistant capability;while both are evidently increased for the composites with 1.0 percent in volume of steel fiber.However,since the strength of steel fiber is greatly higher than that of the cement matrix,the improved amplitude of shear strength for SFCEM is distributed randomly.On the analyses of shear strength,it can be concluded that the transversal wave,especially the unloading transversal wave,is important for the dynamic damage investigation of brittle materials.