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本文较深入地开展了高温环境条件下的超声拉压疲劳实验系统研究,深入分析了试件温度高精测量与自动控制和高温试件设计的关键问题。实验系统可以实现高温环境条件下大于1010周次超高周次的疲劳加载。本实验系统利用传统超声疲劳试验机,使用非接触式红外测温仪对试件温度进行实时动态监测,采用间歇振动的方法保证温度波动小于±3℃。实验结果显示,采用本系统得到的实验结果与传统疲劳加载方式的结果一致性很好。本文工作为进一步开展高温环境条件下金属材料高温超高周(>1010周次)疲劳损伤和疲劳破坏机理研究提供了新的有效的平台。
In this paper, we carried out a deep research on the experimental system of ultrasonic tension and compression fatigue under high temperature environment, and analyzed the key problems of high precision temperature measurement, automatic control and high temperature specimen design. The experimental system can achieve ultra-high-frequency fatigue loading of more than 1010 cycles in high temperature environment. The experimental system using the traditional ultrasonic fatigue testing machine, the use of non-contact infrared thermometer real-time dynamic monitoring of the specimen temperature, the use of intermittent vibration method to ensure temperature fluctuations of less than ± 3 ℃. The experimental results show that the experimental results obtained by this system are in good agreement with the results of the traditional fatigue loading method. This work provides a new and effective platform for further studying the fatigue damage and fatigue failure mechanism of metal materials under high temperature and high temperature (> 1010 weeks) under high temperature and environmental conditions.