Research on Influence of Strain Rate on Dynamic Mechanical Properties of Sepiolite
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摘要: 海泡石矿粉常采用机械冲击破碎方法制备, 粗矿石受到的应变速率不同会导致破碎程度不一致。为了研究应变速率对海泡石动态力学性能影响, 采用分离式霍普金森压杆(SHPB)对海泡石在五种不同应变速率下进行动态压缩试验。结果表明: 海泡石的动态抗压强度、弹性模量以及破碎特性均表现出明显的应变速率效应。动态抗压强度随应变速率的增加呈线性增长; 动态弹性模量随应变速率的增加呈指数增长; 随着应变速率的增加, 破碎形态由劈裂转为压碎, 应变速率越高压碎后的海泡石碎块尺寸越小且粉末增多。Abstract: Sepiolite ore powder is often prepared by mechanical impact crushing method, and the different strain rate of coarse ore compressed will lead to inconsistent crushing degree. In order to study the influence of strain rate on the mechanical properties of sepiolite, a Split Hopkinson Pressure Bar (SHPB) system was used to conduct dynamic compression tests on sepiolite specimens at five different strain rates. The results show that the dynamic compressive strength, the elastic modulus, and the failure characteristics of sepiolite show obvious strain rate effects. The dynamic compressive strength increases linearly with the increase of the strain rate; the dynamic elastic modulus increases with the increase of the strain rate; with the increase of strain rate, the failure mode changes from splitting failure to crushing failure. The higher the strain rate, the smaller the size of crushed pieces and the greater the amount of powder.
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表 1 海泡石的静态力学性能参数
抗压应力/MPa 抗拉应力/MPa 密度/(kg·m-3) 硬度/HV 13.11 6.56 2 080 14 表 2 海泡石试件SHPB试验结果
试样编号 直径D/mm 高度H/mm 冲击气压ρ/MPa 平均应变速率ε /s-1 动态抗压强度σ/MPa 动态弹性模量E /MPa 0.6-2 37.78 23.06 0.05 269 24.8 416.11 0.6-5 37.81 23.11 0.1 356 34.0 601.18 0.6-7 37.85 23.24 0.15 395 41.7 641.74 0.6-14 37.93 23.15 0.2 409 46.2 780.40 0.6-15 37.88 23.02 0.25 430 50.6 1095.23 表 3 海泡石碎块筛分试验结果
试样编号 冲击气压ρ/MPa 平均应变速率·ε/s-1 各筛网上碎块(粉末)占比/% >12.5 mm 8~12.5 mm 5~8 mm 2~5 mm 1~2 mm ≤1 mm 0.6-2 0.05 269 67.36 16.28 10.92 5.44 0 0 0.6-5 0.1 356 51.82 25.77 16.51 5.90 0 0 0.6-7 0.15 395 29.25 35.79 24.30 6.15 3.11 1.40 0.6-14 0.2 409 26.29 32.61 26.22 6.43 4.32 4.13 0.6-15 0.25 430 15.03 21.82 35.96 8.10 5.73 13.36 -
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