Magnetically applied pressure shear for directly measuring dynamic strength of materials
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摘要: 提出一种用于直接测量动载荷下材料强度的新方法，即磁驱动压剪联合加载实验技术。从理论和数值计算上分析了压/剪联合作用下材料的应力偏量与屈服强度关系，计算斜波加载下压/剪联合作用时应力偏量与屈服强度的时空演化特性，给出材料强度数值的计算方法。并基于自行研制的强脉冲电流装置和10 T准静态磁场发生器，利用多点双光源外差位移干涉仪(dual laser heterodyne velocimetry, DLHV)，开展磁压剪实验对2种铝样品的动态强度进行测量，得到不同加载压力下铝样品的强度。结果表明：磁驱动压/剪联合加载技术为材料的高压强度直接测量提供了一种新途径，是可靠的实验技术。Abstract: This paper presents a novel method for directly measuring material strength under dynamic loading, namely the technique of magnetically applied pressure shear (MAPS). The relationship between the stress deviation and the yield strength under MAPS was analyzed theoretically and numerically. The time-space evolutions of the stress deviation and yield strength under MAPS were characterized and calculated. Experiments were conducted based on the CQ-4 and 10 T quasi-static magnetic field generator, both developed by ourselves, using a dual laser heterodyne velocimetry (DLHV), to study the technology of MAPS under ramp wave loadings. The compression strengths of cold rolled pure aluminum and polished pure aluminum under ramp loading were measured and the reliable experimental data were obtained. The results show that the technique of MAPS provides a novel and reliable technique for directly measuring high-pressure strength and can be reliably applied1) “第十一届全国爆炸力学学术会议”推荐论文
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图 2 压剪加载压力时程曲线
Figure 2. Typical loading pressure histories of longitudinal and shear stresses
图 3 磁压剪联合加载计算模型
Figure 3. Calculated model of magnetically applied pressure shear loading
图 5 铝样品压剪状态下切应力分量与等效屈服应力关系
Figure 5. Relation of deviatoric stress and yield stress in aluminum sample under pressure-shear loadings
图 6 ZrO2窗口自由面纵向和横向速度
Figure 6. Longitudinal and transverse velocities at rear surface of ZrO2 window
图 9 充电电压8kV时线圈对中的放电电流和线圈中心位置磁场随时间变化曲线
Figure 9. Discharging current in the coil pair and magnetic field in the centre of coil at charging voltage of 8 kV
图 11 PDV测量的ZrO2单晶自由面±15°倾角方向速度时程曲线
Figure 11. History of velocity at ZrO2 window free surface measured by PDV at ±15° slope angle
图 12 ZrO2界面纵向和横向速度曲线
Figure 12. History of longitudinal and transverse velocities at ZrO2 window rear surface
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