两点应变测量法在SHPB测量技术上的运用

介绍了两点应变测量法在分离式Hopkinson压杆 (SHPB)测量技术上的运用。该方法通过测量一根压杆两个不同地方的应变 ,利用一个简单的反复过程将压杆中相对传播并叠加在一起的右行波与左行波分离 ,从而利用输入杆对试件的多次加载来研究软材料的动态力学性能。利用该方法计算所得的最大应变比利用传统SHPB测量技术得到的最大应变增大了 2～ 3倍。

Application of two-point strain measurement to the SHPB technique

A two point strain measurement method has been applied to the SHPB technique. By measuring strains at two different points of a pressure bar,the method uses a simple iterative process to separate the "left spreading"and "right spreading"waves that overlap together and propagate in opposite directions. With this method, the dynamic properties of soft materials can be studied since the input bar can load the specimen repeatedly.The maximum strain obtained by this method is much bigger than classical SHPB technique, and its feasibility is studied also by theoretical deduction.