“自由—自由”振动梁的动态粘弹仪

THE DYNAMIC VISCOELASTIC APPARATUS FOR FREE-FREE VIBRATING BEAM

Department of Materials Science and Engineering Beijing Institute of Aeronautics and Astronautics Beijing 100083, China

摘要

摘要: 设计制作了“自由-自由”振动梁的动态粘弹仪,可以从室温到250℃的温度范围内连续测量复合材料大试样的动态杨氏模量E'及力量损耗tgδ的温度谱。支撑试样简便,判断共振容易,所用电子仪器少,曲线重复性较好。本仪器制作简单、投资少、见效快,适宜于在实验室条件下自行仿制推广。

Abstract: A dynamic viscoelastic apparatus for "free-free" vibrating beam was developed.It can be used to continually measure the changes of the dynamic Young's modulus and mechanical loss with temperatures for large FRP samples from ambient temperature to 250℃.The method of supporting samples is simple and the judgement on the resonance of samples is easy,Only a few electronic instruments were employed.The repetitiveness of experimental results was good.This-apparatus was easy to be made and cheap.Based on the results obtained from the apparatus, the structure-molecular motion-mechanical property relationships of matrix resins can be established, and the heat resistance of composites can be estimated.These information is particularly useful for designing-application and quality control of composites.