入射波整形技术的实验和理论研究

The Experimental and Theoretical Study on the Incident Pulse Shaping Technique

在硅橡胶材料的分离式霍普金森压杆实验中,实验研究了如何实现常应变率加载,并且得到了整形器尺寸与加载应变率之间,以及加载应变率与试样厚度之间的定量关系。根据预估入射波形的理论模型,给出了采用H62黄铜整形器整形后入射波形的计算结果和实验结果,二者基本上是一致的。

We modified the conventional Split Hopkinson Pressure Bar(SHPB) technique by shaping the incident pulse such that the samples are in dynamic stress equilibrium and in homogeneous deformation during the tests of silicon rubber.According to the method of pulse shaper designing,we had the samples loaded under constant strain rate,and we got the direct relation between the size of pulse shaper and strain rate.A model to predict the incident waveform in the SHPB experiment by use of a single pulse shaper is built according to the theory of stress wave.Incident waveform from experiment and model prediction with H62 brass shaper are obtained.Model predictions are in good agreement with experimental results.