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Tensile and interfacial properties of polyacrylonitrile-based carbon fiber after different cryogenic treated condition

注意:本論文已在 Composites Part B 99 (2016) 358-365 發表

使用者請注明論文出處
Yinnan Zhang a, b, Fujun Xu a, b, *, Chuyang Zhang b, c, Junjie Wang d, Zhemin Jia e,
David Hui f, Yiping Qiu a, b, **
a Key Laboratory of Textile Science & Technology, Ministry of Education (Donghua University), Shanghai 201620, PR China
b College of Textiles, Donghua University, Shanghai 201620, PR China
c College of Textiles and Apparels, Xinjiang University, Urumqi, Xinjiang Uyghur Autonomous Region 830046, PR China
d Key Laboratory of Cryogenics, Technical Institute of Physics and Chemistry, Chinese Academy of Sciences, Beijing 100190, PR China
e School of Aerospace Engineering and Applied Mechanics, Tongji University, Shanghai 200092, PR China
f Department of Mechanical Engineering, University of New Orleans, New Orleans, LA 70148, USA


Abstract
Polyacrylonitrile-based carbon fibers are cryogenically conditioned both through a low cooling rate and a quench rate to explore the effects of cryogenic treatments on properties and micro-structures of carbon fibers. The internal structure, tensile properties and surface morphologies of the fiber are investigated.Increase in crystallinity and tighter packing of molecules of the fiber after the cryogenic treatments are observed regardless the cooling rate. After slow cooling cryogenic treatment, the inter-planar distance increases in the fiber axial direction and decreases in the fiber radial direction, resulting in 3% shrinkage of fiber diameter and extension in fiber axial direction. Scanning electron microscopy and atomic force microscopy analysis show slightly wider and deeper rill-like folds and 41% roughness increase for the fiber surfaces, leading to an increase in interfacial shear strength between the fiber and epoxy by 30.2%. In contrast, after sharp cooling cryogenic treatment, no obvious change is detected in inter-planar distance,fiber diameter, surface morphology and interfacial shear strength with epoxy. The bimodal additive Weibull distributions of tensile strengths for the cryogenic treated fibers show an increase of the bimodality parameter a and a decrease in scale parameter s indicating higher probability of extrinsicdefects but no significant mechanical degradation of the fiber after cryogenic treatments.
Keywords: Carbon fibers;Fibre/matrix bond;Mechanical testing;Surface analysis

摘要:對聚丙烯腈基碳纖維進行了低冷卻速率和淬火速率的低溫處理,以探討低溫處理對碳纖維性能和微觀結構的影響。 研究了纖維的內部結構、拉伸性能和表面形貌,發現無論冷卻速度如何,低溫處理后纖維的結晶度增加,分子緊密堆積。 慢冷深冷處理后,纖維軸向的平面間距增大,徑向的間距減小,導致纖維直徑收縮3%,軸向伸長。 掃描電鏡和原子力顯微鏡分析表明,纖維表面呈細溝狀褶皺,粗糙度增加41%,纖維與環氧樹脂的界面剪切強度提高了30.2%。 相反,經急冷深冷處理后,環氧樹脂的晶面間距、纖維直徑、表面形貌和界面剪切強度均未發生明顯變化。 低溫處理后纖維的拉伸強度呈雙峰Weibull分布,雙峰參數a增大,尺度參數s減小,表明深冷處理后纖維出現擠壓缺陷的概率較高,但纖維的力學性能沒有明顯的退化。

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本站收錄的本文作者的其他論文:

1、 Modification of tensile, wear and interfacial properties of Kevlar fibers under cryogenic treatment
2、Characterization of enhanced interfacial bonding between epoxy and plasma functionalized carbon nanotube films
3、X-ray 3D microscopy analysis of fracture mechanisms for 3D orthogonal woven E-glass/epoxy composites with drilled and moulded-in holes
4、Flexible strain sensor based on aerogel-spun carbon nanotube yarn with a core-sheath structure

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