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疲劳问题由于影响因素多、理论分析误差大、长期实时捕获疲劳信息困难等特点,使得工程中难于对疲劳破坏实现及时的、可靠的预警,这是一直以来困扰机械、土木、航空航天、能源装备等领域研究者们的一个重要课题。针对传统基于应变时程分析疲劳累积损伤的诸多问题,提出了一种以聚偏二氟乙烯(Polyvinylidene Fluoride,PVDF)为感知元件、方便用于结构疲劳监测的无线传感器系统。首先,根据PVDF的感知特性,对其灵敏度系数进行了标定;然后,通过对6061-T6铝合金材料的疲劳性能进行试验研究,验证了该系统的各方面工作性能;最后,通过将试验测点与该铝合金材料的S-N曲线进行对比,验证了该测试方法在研究材料疲劳性能时的可行性。试验结果表明,所开发的疲劳监测系统工作稳定性好、准确性高、实时性强,具有良好的工程应用前景。
Fatigue problems due to many factors, the theoretical analysis of large errors, long-term real-time capture of fatigue information and other characteristics, making the project difficult to achieve timely and reliable fatigue damage warning, which has been plagued by mechanical, civil, aerospace, energy equipment And other fields of researchers an important issue. Aiming at many traditional problems of fatigue cumulative damage based on strain history analysis, a sensor system based on PVDF (Polyvinylidene Fluoride) is proposed to facilitate the fatigue monitoring of structures. Firstly, the sensitivity coefficient of PVDF was calibrated according to the sensing characteristics of PVDF. Then, the fatigue performance of 6061-T6 aluminum alloy was verified by experiments, and the performance of the system was verified. Finally, Compared with the SN curve of the aluminum alloy material, the feasibility of the test method in the study of fatigue properties of materials was verified. The test results show that the developed fatigue monitoring system has good working stability, high accuracy, real-time performance and good engineering application prospect.