针对高温环境钛合金损伤在役监测需要,提出了采用声发射技术对其进行实时动态监测。通过模拟真实机匣内高温环境,对TA15钛合金进行高温拉伸损伤力学声发射监测试验。确定了钛合金为波导杆的材料,将焊接了波导杆的钛合金试件进行不同拉伸速率下的高温拉伸试验。试验结果表明,不同温度下TA15钛合金的力学性能呈现有规律的变化,声发射技术可以成功地监测和表征钛合金的损伤演变,计数能够明显地反映出高温下拉伸试验的不同力学阶段。

In response to the need for in-service monitoring of titanium alloy damages in high-temperature environments, a real-time dynamic monitoring technology using acoustic emission (AE) was proposed. In this paper, the acoustic emission monitoring test of tensile damage mechanics of TA15 titanium alloy at high temperature was carried out by simulating the high-temperature environment in the real casing. Firstly, titanium alloy was determined as the material for waveguide rods. Then, the titanium alloy specimens welded with waveguide rods were subjected to high-temperature tensile tests at different tensile rates. Experiments showed that the mechanical properties exhibited regular changes at different temperatures. Acoustic emission technology can successfully monitor and characterize the damage evolution of titanium alloys, and counting can clearly reflect the different mechanical stages of tensile experiments at high temperatures.