弹片热机械疲劳试验方法研究及设计

Investigation and design for TMF test method of elastic sheet

针对弹片的热机械疲劳(TMF)试验要求,采用机械设计技术、机电技术、冷却技术、计算机技术和数据采集技术,提出了压力载荷和热载荷的加载方法,建立了2种载荷5个试验件的并联试验控制系统,并设计了弹片热机械疲劳试验器。试验结果表明:该系统能够同时模拟服役环境下弹片的压力载荷和热载荷。利用该试验系统进行了弹片的热机械疲劳试验,试验结果再现了弹片在服役状态下的失效模式。试验系统具有良好的重复度、较高的加载频率和加载精度。压力载荷最大相对误差为2.4%,绝对误差小于0.5N。温度载荷最大相对误差为3.55%,最大绝对误差为3.89℃。

Targeting the requirements of thermal mechanical fatigue(TMF)test for elastic sheet,the method of loading pressure and thermal loads was put forward using mechanical design technology,mechanical and electrical technology,cooling technology and data acquisition technology,aparallel test control system of two parallel loads,five test pieces was set up,and a thermal mechanical low cycle fatigue exerciser for elastic sheet was designed.Test results showed that,the system can simulate both the pressure load and thermal load of the elastic sheet in the service environment.The thermal mechanical low cycle fatigue test of elastic sheet was carried out by this test system,and the failure modes of elastic sheet in service state were found.The test system had good repeatability,high loading frequency and loading accuracy.The maximum relative error of pressure load was 2.4%,and the absolute error was less than 0.5 N.The maximum relative error of temperature load was3.55%,and the maximum absolute error was 3.89℃.