侧限压缩下干燥砂的动态力学性能

通过添加波形整形器的分离式霍普金森压杆(SHPB),研究了侧限条件下干燥砂在不同应变率和 不同预压时的动态压缩力学性能,并利用MTS810材料实验系统,研究了干燥砂的准静态压缩应力应变曲 线。实验采用的材料为硅基细颗粒干燥砂,粒径分布范围为150~245m,自然堆积状态的密度为 1.40g/cm3。研究发现,应变率对干燥砂压缩过程影响不大,而不同的预压对实验结果影响显著。

Dynamic mechanical properties of dry sand under confined compression

In order to investigate the impact compressive response of confined dry sand,the dynamic compression experiments of dry sand at different high strain rates and different preloads were conducted on the modified split Hopkinson pressure bar(SHPB)with a thin rubber circular plate as a pulse shaper.Quasi-static compressive properties of the sand were obtained with a MTS810 materials test system.The material studied in this research is silica based grain sand,most sand particles are in the diameter range from 150 to 245 μm.The density of the dry sand material is 1.40 kg/m3 without preload.The results show that the compression response of the dry sand is not sensitive to strain rate,but significantly dependent on the preload.