SHPB test data

A split Hopkinson pressure bar (SHPB) investigation was carried out to verify a new method for quantifying stress-wave attenuation in granite. Using 74.4 mm-diameter high-strength steel bars (E = 214 GPa, c = 5236.8 m/s), the apparatus comprised a 398 mm striker and incident/transmission bars of 2745 mm/1792 mm. Strain gauges (1 MHz sampling and sensitivity coefficient of ) were positioned 1727 mm and 892 mm from the specimen interfaces. A 60 mm × 5 mm paper pulse shaper and petroleum-jelly interface lubrication ensured clean wave generation and minimal friction. Empty-bar tests validated one-dimensional wave propagation and precise alignment. Granite samples (ρ = 2730 kg m⁻³, P-wave = 4573 m s⁻¹, E = 5.71 GPa, ν = 0.28, UCS = 113 MPa) were cut from a single block to limit heterogeneity.

本研究开展分离式霍普金森压杆（Split Hopkinson Pressure Bar，SHPB）试验，旨在验证一种量化花岗岩中应力波衰减的新方法。试验采用直径74.4 mm的高强度钢杆件（弹性模量E=214 GPa，波速c=5236.8 m/s），试验装置包含长度398 mm的撞击杆，以及长度分别为2745 mm和1792 mm的入射杆与透射杆。应变片（采样频率1 MHz，灵敏度系数为）分别布置在距试样界面1727 mm和892 mm的位置。采用尺寸为60 mm×5 mm的纸质脉冲整形器，并辅以凡士林界面润滑，以保障应力波的纯净产生并将摩擦效应降至最低。空杆试验用于验证一维波传播特性与装置的精确对准精度。试验所用花岗岩试样取自同一块岩体以降低非均质性，其物理力学参数如下：密度ρ=2730 kg·m⁻³，纵波波速（P-wave）=4573 m·s⁻¹，弹性模量E=5.71 GPa，泊松比ν=0.28，单轴抗压强度（UCS）=113 MPa。