PVDF压力计在相似材料动态力学参数测试中的应用

发布时间：2018-03-30 04:36

本文选题：分离式霍普金森压杆　切入点：压电传感器　出处：《北京理工大学学报》2017年10期

【摘要】：随着相似材料逐渐用在动力学模型试验中,其动态力学参数的测试和研究显得尤为重要.相似材料是软弱材料,其强度较低,波阻抗也无法与Kolsky杆常用的钢杆或铝杆相匹配,因而无法利用传统的应变测量系统进行动态力学测试.本文基于一维应力波理论,推得被测试件端面应力与应变、应变率之间的关系表达式,进而利用PVDF压电薄膜传感器改进SHPB装置的压力量测方法和系统;采集到相似材料的动态压力信号,得到了相似材料在不同应变率下的全应力应变曲线、动态弹性模量、动态峰值强度以及随速率变化的关系.
[Abstract]:With the application of similar materials in dynamic model tests, it is very important to test and study the dynamic mechanical parameters. The similar materials are weak materials, and their strength is low, and the wave impedance can not match with the steel or aluminum bars commonly used in Kolsky rod. Therefore, the traditional strain measurement system can not be used for dynamic mechanical testing. Based on the one-dimensional stress wave theory, the expression of the relationship between stress and strain and strain rate on the end face of the tested piece is derived in this paper. PVDF piezoelectric thin film sensor is used to improve the pressure measurement method and system of SHPB device, the dynamic pressure signals of similar materials are collected, and the full stress-strain curves and dynamic elastic modulus of similar materials at different strain rates are obtained. The relationship between the dynamic peak strength and the change with the rate.
【作者单位】：解放军理工大学爆炸冲击防灾减灾国家重点实验室;南京理工大学机械工程学院;
【基金】：教育部长江学者和创新团队发展计划(IRT13071) 国家部委基金资助项目(51409257)
【分类号】：TP212;TU45

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