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不同标距及应变率下纤维丝间摩擦对Kevlar 49纤维束力学性能的影响
The effect of friction between filaments on mechanical properties of Kevlar 49 yarns with different gauge lengths and strain rates
投稿时间: 2017-02-22  最后修改时间: 2017-04-13
DOI:
中文关键词:  Kevlar 49  纤维丝  纤维束  标距  应变率  摩擦
英文关键词:Kevlar 49  Filaments  Yarns  Gauge length  Strain rates  Friction
基金项目:
作者单位E-mail
朱德举 湖南大学 dzhu@hnu.edu.cn 
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中文摘要:
      为了研究在不同标距和应变率下摩擦对Kevlar 49纤维束力学性能的影响,首先,利用MTI微型拉力试验机对不同标距(12.5 mm,25.0 mm,40.0 mm)的Kevlar 49纤维丝进行拉伸力学性能测试;然后,利用MTS万能试验机对不同标距(25.0 mm,50.0 mm,100.0 mm,200.0 mm)的Kevlar 49纤维束在处理(涂油润滑)和未处理两种情况下进行静态拉伸测试,采用Instron落锤冲击系统对标距为25.0 mm的单束纤维(处理和未处理)进行动态拉伸测试(应变率=40 s-1、80 s-1、120 s-1和160 s-1);最后,利用Weibull分布模型对试验数据进行统计分析,量化了纤维强度的离散性。结果表明:在一定范围内,Kevlar 49纤维丝的拉伸强度、韧性、峰值应变均随标距的增加而降低,弹性模量随标距的增加而增大;处理和未处理的纤维束静态拉伸强度、韧性、峰值应变及弹性模量相近,即减小纤维丝之间的摩擦对纤维束在静态拉伸作用下的力学性能影响不大;随着应变率增大,相对于未处理的纤维束,经过处理的纤维束强度逐渐降低,降低幅度呈递增趋势,表明在高应变率作用下纤维丝之间摩擦对纤维束的力学性能影响显著。
英文摘要:
      In order to study the friction effect on mechanical properties of Kevlar 49 yarns with different gauge length and different strain rates. Firstly, MTI miniature tensile tester was used to obtain the mechanical properties of Kevlar 49 filaments with different gauge lengths (12.5 mm, 25.0 mm, 40.0 mm).Then, under treated (lubricated with oil) and untreated Kevlar 49 yarns with different gauge lengths(25.0 mm, 50.0 mm, 100.0 mm, 200.0 mm) was tested by MTS microcomputer control electron universal testing machine. By using an Instron drop-weight impact system, the treated or untreated samples was evaluated under dynamic loadings (strain rates =40s-1, 80s-1,120s-1,160s-1) with a gauge length of 25.0 mm. Finally, Weibull distribution model statistical analysis was conducted on the test data to quantify the distribution of fiber strength. The results showed that with the increasing of gauge lengths, the tensile strength, toughness and ultimate strain of Kevlar 49 filaments decreased as well as the elastic modulus increased in a certain range. Tensile strength, toughness, ultimate strain of the treated Kevlar 49 yarns was similar to the untreated Kevlar 49 yarns in quasi-static tests, indicating the friction between filaments had little effect on the quasi-static mechanical parameters of yarns. With the increase of strain rates, the tensile strength of treated yarns decreased gradually compared to the untreated ones, and the change amplitude increased. These results indicated that friction between filaments had a significant effect on the mechanical behaviors of yarns under high strain rates.
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