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朱德举*,黄蒙影.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[J].实验力学,2018,33(3):366~376
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
On the effect of inter fiber friction on mechanical properties of Kevlar 49 fiber bundle under condition of different gauge lengths and strain rates
投稿时间: 2017-02-22  最后修改时间: 2017-04-13
DOI:10.7520/1001-4888-17-036
中文关键词:  对位芳香族聚酰胺纤维Kevlar 49  纤维丝  纤维束  标距  应变率  摩擦
英文关键词:para-aromatic polyamide fiber Kevlar 49  filament  fiber bundle  gauge length  strain rate  friction
基金项目:装备预研教育部联合基金(青年人才)项目(6141A02033602),湖南省重点研发计划项目(2017GK2130),国防科技创新特区项目(17-H863-03-ZT-003-008-06),湖南省战略性新兴产业科技攻关与重大科技成果转化项目(2016GK4016)
作者单位
朱德举* 湖南大学 土木工程学院 长沙 410082 
黄蒙影 湖南大学 土木工程学院 长沙 410082 
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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(12.5mm, 25.0mm, 40.0mm)的Kevlar 49纤维丝力学性能进行拉伸测试。然后,利用MTS万能试验机对不同标距(25.0mm, 50.0mm, 100.0mm, 200.0mm)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25.0mm的纤维束(处理和未处理)进行动态拉伸测试(应变率为40s-1, 80s-1, 120s-1和160s-1)。最后,利用Weibull分布模型对实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,即在静态拉伸作用下减小纤维丝之间的摩擦对不同标距下的纤维束力学性能影响不大。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,这表明在高应变率作用下纤维丝之间的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 fiber bundle under condition of different gauge lengths and different strain rates, firstly, tensile experiment for measurement of mechanical properties of Kevlar 49 fiber bundle with different gauge lengths (12.5mm, 25.0mm and 40.0mm) was carried out respectiely, based on MTI micro tensile testing machine. Then, static tensile experiment for measurement of mechanical properties of Kevlar 49 fiber bundle with different gauge lengths (25.0mm, 50.0mm, 100.0mm, 200.0mm) was carried out respectiely, based on MTS microcomputer control electron universal testing machine under condition of treated (lubricated with oil) and untreated specimens respectively. By using Instron drop-weight impact system, dynamic tensile experiment was carried out for treated and untreated Kevlar 49 respectiely, under condition of strain rates are 40s-1, 80s-1, 120s-1, 160s-1 respectively and with same gauge length of 25.0mm. Finally, Weibull distribution model statistical analysis was conducted to quantify the dispersion of fiber strength. Results show that in a certain range, with the increase of gauge length, the tensile strength, toughness and ultimate strain of Kevlar 49 fiber bundle decreases, while the elastic modulus increases. Tensile strength, toughness, ultimate strain and modulus of elasticity of treated and untreated Kevlar 49 fiber bundle are similar. This indicates that friction between filaments has a little effect on the quasi-static mechanical parameters of fiber bundle. Comparing with untreated yarn, with the increase of strain rate, the tensile strength of treated fiber bundle decreases gradually, and decreasing amplitude shows increasing trend. These results indicate that friction between filaments has significant effect on mechanical behavior at high strain rate.
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