水泥砂浆的平板撞击实验与高压状态方程研究

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振动与冲击 ›› 2018, Vol. 37 ›› Issue (12) : 41-47.

论文

高飞1,2，王明洋1,2，张先锋1，熊玮1，邹慧辉2，文祝1,2

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A study on planar impact and equation of sate for cement mortar

GAO Fei1,2,WANG Mingyang1,2,ZHANG Xianfeng1,XIONG Wei1,ZOU Huihui2,WEN Zhu1,2

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摘要

采用火药发射枪加载技术和PVDF应力测试技术，对强度约40 MPa含初始孔隙的水泥砂浆在平板撞击条件下的冲击特性进行了实验研究与分析。基于PVDF传感器实测的水泥砂浆试样的原始时间-电压波形，换算得到相应的时间-应力波形。结果表明：不同位置处的应力在迅速上升至波峰后均随时间衰减，冲击波峰值随传播距离而衰减，冲击速度越高衰减效应越明显，呈现出明显的粘弹性特性和耗散特性。从细观结构分析表明材料内部的微损伤缺陷是造成冲击波衰减的物理本质。再从冲击绝热数据出发，拟合了D-u与 P-ρ Hugoniot关系，估算了砂浆的Hugoniot弹性极限，初始弹性波速及密实材料波速，对材料的冲击压缩特性采用P-α状态方程和Mie-Grüneisen型多项式状态方程分段描述，并给出了模型参数。

Abstract

In order to study the dynamic mechanical properties of 40 MPa cement mortar with initial porosity, the impact compression tests of cement mortar material under seven different velocities were conducted using a powder gun. The samples timevoltage waveforms were recorded based on PVDF pressure sensor and then the corresponding timepressure waveforms were derived. The stress waveforms of different position found in the experiment indicate that the stress wave is on rapid rise to the peak then decays with time and the propagation distance. It illustrates that cement mortar material has obvious rate sensitivity, viscoelastic and energy dissipation characteristics, and the attenuation of stress wave can be attributed to the microdamage defects inside the material. Then, through further analysis of the experimental data, the shock Hugoniot relationships were determined, which is a linear relationship between the shock wave speed and the wave particle velocity, and densitypressure shock Hugoniot relationship were described by the experimental data. On the other hand, the Hugoniot elastic limit (HEL), the initial elastic wave velocity and the wave velocity of granular material were obtained. Moreover, the Pα equation of state (EOS) and highpressure polynomial Grüneisentype EOS for cement mortar considering initial porosity compaction was given, and the material parameters in the EOS were fit.

导出引用

高飞1,2，王明洋1,2，张先锋1，熊玮1，邹慧辉2，文祝1,2. 水泥砂浆的平板撞击实验与高压状态方程研究[J]. 振动与冲击, 2018, 37(12): 41-47

GAO Fei1,2,WANG Mingyang1,2,ZHANG Xianfeng1,XIONG Wei1,ZOU Huihui2,WEN Zhu1,2. A study on planar impact and equation of sate for cement mortar[J]. Journal of Vibration and Shock, 2018, 37(12): 41-47

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