ANALYSIS OF HIGH STRAIN RATE DYNAMIC TESTS ON CONCRETE

摘要

Experimental problems encountered in the testing of concrete with techniques using bars are studied in this paper. The commonly used SHPB test (Split Hopkinson Pressure Bar), the DIHB test (Direct Impact Hopkinson Bar), are examined. At first, it is shown that recent improvements in the data processing such as wave dispersion correction and exact time shifting are indispensable to obtain accurate measurements in those tests. The accuracy of conventional analyses which are based on the assumption of homogeneous stress and strain fields is afterwards investigated with the aid of transient numerical simulations. It is shown that only one of those conventional analyses gives an acceptable precision.