PVDF应力测量技术及在混凝土冲击实验中的应用

Stress-measurement method by PVDF gauge and its application to impact test for concrete

1.
Department of Engineering Mechanics, Hefei University of Technology, Hefei 230009, Anhui, China;
2.
CAS Key Laboratory of Mechanical Behavior and Design of Materials, University of Science and Technology of China, Hefei 230026, Anhui, China

摘要: 介绍了使用PVDF(polyvinylidene fluoride，聚偏二氟乙烯)应力计的应力直接测量技术。在SHPB装置上进行自制PVDF应力计动态压电系数的标定实验，分析了应力集中、横向泊松效应、摩擦效应对PVDF应力计信号及动态压电系数的影响。用PVDF应力计进行了混凝土的冲击压缩实验。利用混凝土前后端面PVDF应力计信号分析了实验过程中混凝土试样的应力均匀性。与应变计直测应变技术相结合得到了混凝土的动态应力-应变关系。
- 爆炸力学 /
- 应力直接测量技术 /
- SHPB实验 /
- PVDF应力计 /
- 混凝土
Abstract: The direct stress measurement method by PVDF gauge is introduced. The dynamic piezo constant of PVDF gauge is calibrated on the SHPB set-up. Influences of stress concentration, Poisson effect, friction effect on the pulse and the dynamic piezo constant of PVDF gauge are discussed. The impact compression experiment of concrete is performed with PVDF gauges. The uniformity of stress within the concrete specimen is analyzed with the data from the PVDF gauges between the bar and the specimen, and combined the data directly measured from the strain gage glued on the specimen, the dynamic stress-strain curve is derived.
- mechanics of explosion /
- direct stress-measurement method /
- SHPB test /
- PVDF gauge /
- concrete