关于高强中模碳纤维模量测试的研究

Study on Modulus Test of High Strength Middle Modulus Carbon Fiber

针对国内碳纤维拉伸模量的测试现状和国内外测试标准的区别,以国产QZ5526-12K聚丙烯腈(PAN)基碳纤维为研究对象,采用万能材料试验机比较了最大预载、应变范围、加载速度、引伸计标距和加强片等对模量测试的影响。结果表明,最大预载、应变范围和加强片等因素对拉伸模量的测试影响显著,而加载速度和引伸计标距等对拉伸模量的测试基本无影响。通过使用牛皮纸对固化后的纤维样条进行加强,当设置最大预载约为断裂载荷的10%、应变范围为0.1%~0.6%时,可以更加合理地表征高强中模碳纤维的模量。

In this paper, effect of initial load, strain range, loading speed, extensometer gauge and stiffeners on the modulus test were studied according to the testing status of carbon fiber＇s tensile modulus in China and the difference between domestic and foreign testing standards. Domestic QZ5526 - 12K polyacrylonitrile （PAN） - based carbon fiber was taken as the research object and the universal testing machine was adopted as the means of characterization. The results show that the initial load, strain range and stiffeners have significant influence on the tensile modulus test, while the loading speed and extensometer gauge have little effect on the test. When the Kraft paper is used to reinforce the fiber spline, the chord modulus is set, the initial load is about 10% of the breaking load and the strain range is 0. 1% - 0. 6% , the modulus of the high strength medium modulus carbon fiber can be more properly characterized.