直径测定方法对碳纤维Weibull模数和断裂韧性参数的影响

玻璃钢/复合材料 ›› 2017, Vol. 0 ›› Issue (12): 19-24.

直径测定方法对碳纤维Weibull模数和断裂韧性参数的影响

王美玲¹,边文凤^1*,姜兆春²

1.哈尔滨工业大学航天学院,黑龙江150001
2.中国人民解放军空军驻青岛地区军事代表室,青岛266000

收稿日期:2017-04-06 出版日期:2017-12-20 发布日期:2017-12-20
通讯作者: 边文凤(1963-),女,博士,教授,主要从事复合材料力学性能研究与结构强度设计方面的研究,bianwf@163.com。
作者简介:王美玲(1981-),女,博士,主要从事碳纤维的微观结构及其力学性能方面的研究
基金资助:
国家自然科学基金(11072069)

EFFECTS OF DIAMETER ITSELF ON WEIBULL MODULUS AND FRACTURE TOUGHNESS OF PAN-BASED CARBON FIBER

WANG Mei-ling¹, BIAN Wen-feng^1*, JIANG Zhao-chun²

1.College of Aerospace, Harbin Institute of Technology, Harbin 150000, China
2.Air Force Military Representative Office in Qingdao, Qingdao 266000, China

Received:2017-04-06 Online:2017-12-20 Published:2017-12-20

摘要/Abstract

摘要： 碳纤维具有体积效应,直径对碳纤维力学性能的影响是不容忽视的,但是科研工作者基本将注意力集中于碳纤维直径本身的不均匀性,忽略了不同标准、不同测试方法对碳纤维直径数值的影响,从而导致碳纤维力学性能数据的不确定性。采用两种常用的碳纤维直径表征方法和一种图像处理的方法对碳纤维直径进行表征,分析了不同方法对碳纤维拉伸强度以及碳纤维应用中的重要参数Weibull模数和断裂韧性的影响,并采用数据统计方法给出不同直径方法对力学性能数据偏差的调整和校准。结果表明,三种测试方法计算得到的Weibul模数和断裂韧性是不同的,图像处理方法能够正确表征碳纤维的直径和力学性能。采用数据统计方法得到的碳纤维直径修正参数,可以有效修正测试误差,提高碳纤维力学性能的准确性。

关键词: 碳纤维, Weibull, 直径, 断裂韧性, X-ray衍射

Abstract: The effect of diameter of carbon fiber on the mechanical properties is dramatic. The diameter of carbon fiber present obvious lateral and vertical in-homogeneity. Conventional testing technique cannot characterize the diameter of carbon fiber accurately and the deviation made by testing technique is often ignored for performance of carbon fibers and composite products. In this study, two conventional and one image processing methods for testing diameter were analyzed in order to evaluate the effect of the testing technique on Weibull modulus and fracture toughness, the effects of irregular shape on the properties of the carbon fiber were studied, and scheme for correction and calibration was given. The results showed that the diameters tested by the three technique were different and in the inverse proportional relationship fracture toughness, Weibull modulus and diameter had not a linear relationship, but could prove that the image processing method could correctly represent the diameter of the carbon fiber and the mechanical properties. The data tested by method of image processing could be considered as realistic values, and the data tested by method of SEM and calculation could be corrected through SPSS statistical software, and improve the accuracy of the carbon fiber mechanical properties effectively.

Key words: carbon fibers, weibull, diameter, fracture toughness, X-ray diffraction

中图分类号:

TB332

王美玲,边文凤,姜兆春. 直径测定方法对碳纤维Weibull模数和断裂韧性参数的影响[J]. 玻璃钢/复合材料, 2017, 0(12): 19-24.

WANG Mei-ling, BIAN Wen-feng, JIANG Zhao-chun. EFFECTS OF DIAMETER ITSELF ON WEIBULL MODULUS AND FRACTURE TOUGHNESS OF PAN-BASED CARBON FIBER[J]. Fiber Reinforced Plastics/Composites, 2017, 0(12): 19-24.

参考文献

[1] Peirce F T. Tensile test for cotton yarns, V: "The weakest link", Theorems on the strength of long and of composite specimens[J]. Journal of the Textile Institute, 1926, 17: 355-368.
[2] Natio K. Tensile properties and Weibull modulus of some high-performance polymeric fibers[J]. Journal of Applied Polymer Science, 2013, 128: 1185-1192.
[3] Naito K, Yang J M, Tanaka Y. The effect of gauge length on tensile strength and weibull modulus of polyacrylonitrile (PAN) and pitch-based carbon fibers[J]. Journal of Materials Science, 2012, 47: 632-642.
[4] Tetsuy T, Takashi M. Size effect on tensile strength of carbon fibers[J]. Materials Science and Engineering, 1997, 238: 336-342.
[5] 陈新文, 沙金伟, 裴高林. 碳纤维直径和根数试验方法: GB/T 3364—2008[S]. 2008.
[6] 翟全胜, 叶宏军, 刘俊仙. 碳纤维复丝拉伸性能试验方法: GB/T 3362—2005[S]. 2005.
[7] 谭婷婷, 王成国, 井敏, 等. PAN基碳纤维的微观组织结构与力学性能关系研究[J]. 功能材料, 2012, 16(43): 2226-2230.
[8] 刘福杰, 范立东, 王浩静, 等. 高强度炭纤维微观结构分析及力学性能的比较[J]. 功能材料, 2007, 10(38): 1723-1730.
[9] Irwin G R. Analysis of stresses and strains near the end of a crack traversing a plate[J]. ASME Journal of Applied Mechanics Transaction, 1957, 24: 361-364.
[10] Hedgepeth J M. Stress concentrations in filamentary structure[J]. NASA Technical Note D-882, 1961, 1-30.
[11] Helmer T, Peterlik H, Kromp K. Coating of carbon fibers-the strength of the fibers[J]. Journal of the American Ceramic Society, 1995, 78: 133-136.
[12] Whitney W, Kimmel R M. Griffith equation and carbon fiber strength[J]. Nature Physics Science, 1972, 237: 93-94.
[13] 郑斌, 陈聪慧, 黄娜, 等. 碳纤维表面微观结构的定量化表征方法[J]. 宇航材料工艺, 2012, 42(2):103-107.
[14] Whitney W, Kimmel R M. Griffith equation and carbon fiber strength[J]. Nature Physical Science, 1972, 237: 93-94.
[15] Honjo K. Fracture toughness of PAN-based carbon fibers estimated from strength-mirror size relation[J]. Carbon, 2003, 41: 979-984.
[16] Shioya M, Takaya A. Characterization of microvoids in carbon fibers by absolute small angle X-ray measurements on a fiber bundle[J]. Journal of Applied Physics, 1985, 58: 4074-4082.
[17] Dobb M G, Guo H, Johnson J D. Image analysis of lattice imperfections in carbon fibers[J]. Carbon, 1995, 33: 1115-1120.
[18] Bansal G K. Effect of flaw shape on strength of ceramics[J]. Journal of. American Ceramic Society, 1976, 59: 87-88.
[19] Mecholsky J J, Freiman S W, Rice R W. Fracture surface analysis of ceramics[J]. Journal of Materical Science, 1976, 11: 1310-1319.
[20] Bansal G K, Duckworth W H. Fracture stress as related to flaw and fracture mirror sizes[J]. Journal of the American Ceramic Society, 1977, 60: 304-310.