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PBO和芳纶纤维单丝拉伸性能影响因素分析
车辙, 李敏, 李庆辉, 韩建超, 张佐光
北京航空航天大学材料科学与工程学院, 空天材料与服役教育部重点实验室, 北京 100191
摘要:
使用等速拉伸试验仪测试了进口和国产聚对苯撑苯并二噁唑(PBO)纤维、芳纶纤维的单丝力学性能,探究了不同制样条件、测试条件对有机纤维单丝拉伸性能的影响,影响因素包括拉伸速率、试样标距、纤维含湿率以及热老化温度。结果表明:试样标距由5 mm增至60 mm,4种纤维的Weibull统计强度均逐渐减小;随着拉伸速率由5 mm/min增至200 mm/min,4种纤维的Weibull强度均表现出先增大后减小的变化规律;随着吸湿率增加,进口PBO和芳纶纤维强度逐渐下降;随着老化温度升高,纤维的单丝拉伸强度下降,进口PBO和芳纶纤维在300℃热处理40 h后强度分别下降39.1%和51.6%。
关键词:  PBO纤维  芳纶纤维  单丝测试  拉伸性能  Weibull分布
DOI:10.12044/j.issn.1007-2330.2018.06.017
分类号:TB332
基金项目:
Analysis of Factors Affecting Tensile Properties of PBO and Aramid Fiber Monofilament
CHE Zhe, LI Min, LI Qinghui, HAN Jianchao, ZHANG Zuoguang
Key Laboratory of Aerospace Materials and Performance, Ministry of Education, School of Materials Science and Engineering, Beihang University, Beijing 100191
Abstract:
The mechanical properties of monofilament of imports and domestic poly-phenylene benzodiazole (PBO)fiber,and aramid fiber were measured by constant velocity tensile tester. The effects of different preparation conditions and test conditions on the tensile properties of organic filaments were investigated. The main factors included loading rate,gauge length,fiber moisture absorption and thermal aging temperature. The results show that the tensile strengths of the four fibers calculated by Weibull statistical method decrease gradually with the gauge length increasing from 5 mm to 60 mm. With the loading rate increasing from 5 mm/min to 200 mm/min,the tensile strengths of the four kinds of fibers show first increase and then decrease trend of changes. With the increase in moisture absorption,the strengths of imported PBO fiber and aramid fiber both decrease gradually. As the accelerated aging temperature increases,the imported PBO fiber and aramid fiber show reduced tensile strength,which decrease by 39.1% and 51.6% respectively after heat treatment at 300℃ for 40 h.
Key words:  PBO fiber  Aramid fiber  Monofilament test  Tensile properties  Weibull distribution