波形整形器在酚醛树脂的霍普金森压杆实验中的应用

利用霍普金森压杆在室温下进行了应变为 10 2 ～ 10 3 s-1的冲击压缩实验 ,同时采用波形整形器使入射波的上升沿变宽 ,更好地满足试件中应力应变均匀分布的条件 ,使实验更接近常应变率加载的条件。结果表明 ,酚醛树脂是一种应变率敏感材料 ,在室温下和高应变率下表现出冲击脆化的特征。

Application of Wave Shaper in SHPB Experimental Study of Phenolic Resin

The dynamic compressive behavior of phenolic resin has been studied at room temperature and at strain rates from about 10 2 to 10 3 s -1 using SHPB technique. Wave shapers have been utilized to modify the incident wave, the rising time of the wave was effectively expanded as compared with those in traditional SHPB, so that the condition of uniform distribution of stress and strain in specimen is satisfied more sufficiently, and furthermore a constant strain rate is ensured during the loading history. The experiments show that the stress strain curve of solidified phenolic resin is rate dependent, and solidified phenolic resin shows character of brittleness at high strain rate.