分离式大直径Hopkinson杆实验技术研究进展

Research Progress of Large-diameter Split Hopkinson Bar Experimental Technique

分离式大直径Hopkinson杆(SHB)是一种用于研究混凝土和其他非均匀材料动态力学性能的重要手段,杆直径增大会导致传统分离式Hopkinson压杆实验技术的基本假定失效,因此对实验技术、数据处理及实验结果分析等形成了新的挑战。介绍了大直径SHB杆实验技术的发展历程,总结了杆直径增加所带来的几何弥散效应、试件应力均匀性、试件端面平行性和横向惯性效应等问题及相应的解决方法,分析了大直径SHB实验技术的研究方向和热点问题。

The large-diameter split Hopkinson bar (SHB) technique is an important means for studying the dynamic mechanical properties of concrete and other heterogeneous materials, but the basic assumptions of traditional split Hopkinson pressure bar may not always hold with the increase in SHB diameter, which has brought new challenges to experimental technique, data processing and analysis of experimental results. The brief development history of large-diameter split Hopkinson bar technique is reviewed. Then the wave dispersion effect, stress uniformity in specimen, non-parallel end-faces of specimen, and transverse inertia effect due to the increase in SHB diameter, as well as the corresponding solutions are summarized. The research direction and hotspots of large-diameter SHB experimental technique are discussed.