A simple experimental method was established in order to evaluatethe mode II interlaminar fracture toughness of composite laminatesunder low velocity impact loading (impact velocity, Vo<20 m/sec0.This method was essentially an impact version of the ENF (End NotchedFlexure) test using SHPB (Split Hopkinson Pressure Bar) technique,where a slow-gradient Ramped incident stress wave was utilized toreduce the kinematic effects on the behavior of The specimen andconsequently the dynamic energy release rate was calculated by asimple Estimation formula based on static beam theory and compliancemethod.
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