可变温的固体材料弹性参数测量系统研究

基于超声共振频谱法原理,研制了可在变温条件下工作的超声共振频谱法测量系统,包括超声传感器、声学发射和接收系统、恒温系统以及数据采集和分析系统。在常温下分别测量了3种不同能量品质因数（Q值）的固体材料的弹性参数,分析了影响测量准确性的因素,测量的共振峰匹配误差（RMS）可小于0.04%,与国外先进商业仪的测量结果有良好的一致性。在此基础上,测量了轴承钢（9Cr18）从293 K至353 K的弹性参数,获得了轴承钢材料的等温压缩系数随温度变化的关系。该系统具备扩展测量温度范围的能力,所采用的超声共振测量元件,使得系统不做任何改动,在防氧化的保护气氛下,可将测量温度上限扩展至500 K;对超声信号激励和接收方式做相应改变,可扩展至更高测量温度。

Study on the Setup for Measurement of Temperature-dependent Elastic Properties of Solids

Based on the principle of ultrasonic resonance spectrum, a setup is developed including the ultrasonic signaling and detecting system, the thermostat and the data analysis software.The elastic modulus of three samples in different quality factors are measured at room temperature, and the effects influencing the measurement are investigated. The resonant frequency matching error (RMS) of 0.04% has been reached with the measurements by the developed setup. The results agree well with those of the global advanced commercial instruments. In addition, bearing steel（9Cr18）are measured at temperature from 293 K to 353 K for isothermal compressibility. The system is capable to measure the elastic modulus of solids at temperature up to 500 K at anti-oxidation atmosphere. After redesigning the ultrasonic signaling and detection system, it is capable for measurements at higher temperature.