SHPB技术研究混凝土动态力学性能存在的问题和改进

An improvement in measuring the dynamic properties of concrete material by the traditional SHPB technique

根据实验和理论分析,目前分离式Hopkinson压杆装置(SHPB)间接测量混凝土材料动态应力—应变关系时主要存在三方面问题,分别是应力应变不均匀的限制、大尺寸SHPB压杆产生的应力波弥散及数据处理时应力波波头选取的影响。上述问题使得用传统SHPB方法在研究混凝土材料动态力学性能时的可靠性和精确性大大降低。因此,该文对上述问题的解决和改善进行了初步探讨。

There exist three main problems in the split Hopkinson pressure bar(SHPB) technique of measuring the dynamic properties of concrete material,which are the restriction of nonuniform stress (strain),the dispersion in wave propagation due to the large-diameter SHPB,and the influence of initial rising point of stress wave.The reliability and accuracy of the traditional SHPB technique are reduced because of these problems. Here proposed is an improvement to the traditional SHPB technique for avoiding the above difficulties.