Bar Signal Data Derived from a Compression-to-Tension Stress Conversion Structure in an SHPB Test

A specimen designed to convert compressive stress into tensile stress during the split Hopkinson pressure bar (SHPB) test is employed for the inverse calibration of a constitutive model for steel with a flow stress exceeding approximately 1,600 MPa. This calibration is accomplished by tracking the bar signals through repeated simulations. The maximum strain rate, strain, and temperature were approximately 6,500 /s, 0.53, and 550 K, respectively. These values significantly surpassed those obtained from a standard SHPB test, as predicted by an Excel template referenced elsewhere. The advantages of the proposed calibration method are discussed in comparison to the conventional approach.本研究采用一款专为分离式霍普金森压杆（split Hopkinson pressure bar, SHPB）试验中实现压应力向拉应力转换而设计的试样，用于流动应力约超过1600 MPa的钢材本构模型的逆向标定。该标定流程通过反复仿真追踪压杆信号得以完成。试验的最大应变率、最大应变与最高温度分别约为6500 /s、0.53与550 K。上述参数均显著高于由其他文献中引用的Excel模板预测的标准SHPB试验结果。本文还对比常规标定方法，对所提标定方案的优势展开了讨论。