冲击载荷作用下PZT-5压电陶瓷的力电特性

Dynamic Behavior of PZT-5 Piezoelectric Ceramics under Impact Loading

压电陶瓷是压电冲击传感器的核心元件。采用分离式霍普金森压杆(SHPB)实验技术研究PZT-5压电陶瓷在冲击载荷作用下的力电特性,进行了4~14 m/s不同速度的实验。实验中为保证试件与压杆绝缘,采用了对试件影响较小的表面溅射Al2N3的工艺,溅射厚度为1~3μm。实验结果表明:在冲击加载过程中,PZT-5压电陶瓷的应变变化表现出黏性性质,其产生的电荷与加载过程中试件的应力、应变均相关;当加载速度超过一定值时,加载过程中压电陶瓷可能产生损伤,不同的损伤程度也影响电荷的产生;PZT-5压电陶瓷的力学和电学性能具有明显的率相关性。

Piezoelectric ceramics are the core components of piezoelectric impact sensors.The mechanical and electrical behaviors of PZT-5 piezoelectric ceramics were studied by split Hopkinson pressure bar(SHPB)experimental technique.The tests were carried out at speeds of 4-14 m/s.In order to ensure the insulation between specimen and pressure bar,a process of sputtering Al2N3 on the surface that with less influence on the test piece was used,and the sputtering thickness was 1-3μm.The experimental results of SHPB were analyzed and discussed.The results show that the strain change of PZT-5 piezoelectric ceramics exhibits viscous properties during impact loading,and the charge generated is related to the stress and strain of the specimen during loading.When the loading speed exceeds a certain level,the piezoelectric ceramic may be damaged during the loading process,and the degree of damage also affects the generation of charge.The mechanical and electrical properties of PZT-5 piezoelectric ceramics have obvious rate correlation.