Abstract This paper describes a new single-shear specimen (SSS) and method to characterize the dynamic shear behavior of bulk metals using a traditional Split Hopkinson Pressure Bar (SHPB). By this method, the shear behavior of materials can be tested conveniently over a wide range of strain rates within 105 s−1. This technique was applied to a 304 austenitic stainless steel (ASS) under shear strain rates from 0.001 s−1 to 38700 s−1 at room temperature. Based on finite element (FE) simulations, it was found that the deformation of the specimen shear zone was dominated by shear stress/strain components. Stress state parameters represented by stress triaxiality η and Lode angle parameter θ - were found very close to zero, indicating a deformation mode of simple shear. Besides, an obvious gap existed between the local deformation behavior in the specimen shear zone and the macroscopic stress-strain relations measured by the strain gauges on the SHPB bars. A correction coefficient method was adopted to extract the real shear behavior from the experimentally obtained force-displacement data. Through comparisons between the tested and simulated stress-strain curves, a good agreement was obtained.

中文翻译：

---

一种应用于304奥氏体不锈钢的块状金属动态剪切试验新技术

摘要 本文描述了一种新的单剪切试样 (SSS) 和使用传统分裂式霍普金森压力棒 (SHPB) 表征大块金属动态剪切行为的方法。通过这种方法，可以在 105 s-1 内的广泛应变率范围内方便地测试材料的剪切行为。该技术应用于 304 奥氏体不锈钢 (ASS)，剪切应变率在室温下从 0.001 s-1 到 38700 s-1。基于有限元 (FE) 模拟，发现试样剪切区的变形主要受剪切应力/应变分量的影响。发现以应力三轴性 η 和洛德角参数 θ - 表示的应力状态参数非常接近于零，表明为简单剪切变形模式。除了，试样剪切区的局部变形行为与 SHPB 棒上应变计测量的宏观应力-应变关系之间存在明显的差距。采用修正系数法从实验获得的力-位移数据中提取真实的剪切行为。通过测试和模拟应力-应变曲线之间的比较，获得了良好的一致性。