玻璃纤维束拉伸力学性能影响参数试验研究

Experimental Study of Parameters Affecting the Tensile Mechanical Properties of Glass Fiber Bundle

利用MTS万能试验机对不同标距(25,50,100,150,200和300mm)的玻璃纤维束进行了准静态(应变率为1/600s^(-1))拉伸测试.同时,利用Instron落锤冲击系统分别研究了标距为25mm的试样在不同应变率(40,80,120和160s^(-1))和不同温度(25,50,75和100℃)条件下的力学性能.结果表明,玻璃纤维束的拉伸力学性能与标距、应变率和温度具有相关性:杨氏模量随着标距和应变率的增加而增大,但随着温度的增加而减小;拉伸强度随着标距的增加而减小,随应变率的增加而增大,但随着温度的增加却呈先减后增的趋势;峰值应变随着标距增加而减小,但随温度的增加而增大.最后,利用Weibull模型进行统计分析,量化了不同标距、应变率和温度下纤维拉伸强度的随机变化程度,获得的Weibull参数可服务于工程应用.

Glass fiber bundles with different gage lengths （25, 50, 100, 150, 200 and 300 mm） were tested under quasi-static loading at a strain rate of 1/600 s-1 using a MTS load frame, and samples with a gage length of 25 mm were tested under dynamic tensile loading at four different strain rates （40, 80, 120 and 160 s-1） and four distinct temperatures （25, 50, 75, 100 ℃） utilizing a drop-tower impact system. The experimental results show that the mechanical properties are dependent on the gage length, strain rate and temperature. Young＇s modulus increases with the increasing gage length and strain rate, but decreases with the increasing temperature. Tensile strength decreases with the increase of the gage length, but increases with the increase of the strain rate, while it decreases firstly and then increases as the temperature increases. Ultimate strain decreases with the increase of the gage length, but increases as the temperature increases. Finally, Weibull statistics were used to quantify the degree of variability in yarns strength at different gage lengths, strain rates and temperatures, and the obtained Weibull parameters can be used for engineering application.