高温材料的阻尼特性实验研究  

Experimental Research on Damping Measurement of High-Temperature Materials

作　　者：杨智春[1] 温金鹏[1] 李斌[1] 孙浩[1] 刘金利[1] 

机构地区：[1]西北工业大学,陕西西安710072

出　　处：《稀有金属材料与工程》2010年第8期1360-1364,共5页Rare Metal Materials and Engineering

基　　金：国家自然科学基金(10672135);教育部新世纪优秀人才支持计划(NCET-04-0965)

摘　　要：采用双悬臂梁试件,通过基础激励下的共振驻留法,开发了一套高温材料在真空环境下的阻尼测试系统。研究了提高测试精度的方法,并分析了空气阻尼对阻尼测试结果的影响,并以Ti-6-4合金为对象,研究了阻尼随温度、应变幅值及振动频率的变化规律。A damping measurement system was developed for high temperature materials using double-reed cantilever specimens by means of resonant-dwell under base excitation in a high-temperature and vacuum environment.Some methods were proposed to improve the accuracy of damping measurement.The effect of air damping on damping tested results was analyzed.The damping of Ti-6-4 alloy was tested by the system and the relationships of material damping to temperature,strain amplitude and vibration frequency were studied.Results show that air damping has a significant effect on the damping of materials.The damping of Ti-6-4 alloy keeps constant and the vibration frequency has little effect on it below 400 oC.However,it increases rapidly with temperature elevation above 400 oC and the vibration frequency has a complicated effect on it.The effect of strain amplitude on the damping of Ti-6-4 alloy can be neglected in the temperature range from 25 to 600 oC.

关 键 词：材料阻尼 共振驻留 双悬臂梁 

分 类 号：TG146.23[一般工业技术—材料科学与工程]