摘要
针对复合材料的超高周疲劳问题,提出了一种基于超声疲劳实验装置对复合材料进行三点弯曲试验的方法;阐述了进行复合材料超高周疲劳试验的必要性;利用ABAQUS软件分析了变幅杆、连接杆及试件的模态,得出设计的该装置及试件的谐振频率满足试验需求;针对试验过程中的温升现象,提出了液氮与压缩空气复合式冷却系统。结果表明,该方法大大缩短了试验周期,提高了试验效率,消除了试样在高频加载过程中的热效应,保证了实验结果的有效性。
In order to solve the problem of composite`s very high cycle fatigue(VHCF), a method of three-point bending test based on ultrasonic fatigue testing device was proposed; the necessity of composite VHCF test was discussed; the modal of the horn, the connecting rod and the specimen was analyzed by ABAQUS, and the resonant frequency of the designed device as well as the specimen was satisfied. Aiming at the phenomenon of temperature rise in the experiment process, a combined cooling system of liquid nitrogen with compressed air was put forward. The results indicate that the method greatly shortens the test period, improves the test efficiency, eliminates the thermal effect of the specimen during the high frequency loading period, and ensures the validity of the experimental results.
引文
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