Numerical validation of split Hopkinson pressure bar technique for evaluating tensile mechanical properties of CFRP laminates

摘要

The present study proposes a simple numerical simulation technique for the split Hopkinson pressure bar (SHPB) and then investigates the experimental conditions for composite materials in a tensile-loading SHPB. The following issues were investigated through experiment and numerical simulation: (i) the effects of the cross section and acoustic mismatch between the jig with a slit and screw and the input/output bars on the loading condition and (ii) the effects of the duration time of the applied load and the acoustic impedance mismatch on the stress-strain curve obtained by SHPB testing. From the numerical simulation results, the following conclusions were found: (i) the proposed jig with a slit and screw can apply an ideal one-dimensional displacement to a specimen and (ii) the material characterization of a composite material by SHPB testing might be possible by optimizing a longer duration time if the acoustic mismatch is greater.