纤维波纹对层间增韧碳纤维/环氧复合材料单向板力学性能的影响
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摘要
本文采用层间增韧型碳纤维/环氧预浸料X850,通过碾压预制的面外波纹和预浸料叠层中插入预浸料条两种方法,分别制作了含面内纤维屈曲和面外纤维褶皱缺陷的单向层板,成型固化采用热压罐工艺。对复合材料中的两种纤维波纹进行了表征,并对拉伸与压缩性能进行了测试分析。实验结果表明:得到了波纹比不同的复合材料试样,纤维含量一致且无其他缺陷;在所预制的波纹比范围内,面外褶皱对层板的拉伸性能影响较小,压缩性能小幅降低,而拉伸及压缩性能对面内屈曲非常敏感,随波纹比增大,强度、模量及试样的破坏模式均发生显著变化,说明纤维波纹形式对该类缺陷的评估十分重要。
In this study,interlaminar toughening carbon fiber/epoxy prepreg,i.e. X850,was adopted. Based on autoclave curing process,two kinds of unidirectional carbon fiber laminates with in-plane and out-of-plane waviness were fabricated by rolling prefabricated out-of-plane waviness and inserting prepreg strip into prepreg stack,respectively. The two kinds of fiber waviness defects in composites were characterized. In addition,tensile and compressive properties were measured and analyzed. The experimental results show that composite specimens containing different fiber waviness ratio( WR) were obtained with almost the same fiber content without other defects. For the range of prefabricated WR,the effect of out-of-plane wrinkling on tensile property can be neglected and compressive property decrease slightly. However,tensile and compressive properties are very sensitive to in-plane buckling. Their modulus,strength and failure mode change significantly,as WR increases. It is indicated that the type of fiber waviness is very important for evaluating this kind of defect.
In this study,interlaminar toughening carbon fiber/epoxy prepreg,i.e. X850,was adopted. Based on autoclave curing process,two kinds of unidirectional carbon fiber laminates with in-plane and out-of-plane waviness were fabricated by rolling prefabricated out-of-plane waviness and inserting prepreg strip into prepreg stack,respectively. The two kinds of fiber waviness defects in composites were characterized. In addition,tensile and compressive properties were measured and analyzed. The experimental results show that composite specimens containing different fiber waviness ratio( WR) were obtained with almost the same fiber content without other defects. For the range of prefabricated WR,the effect of out-of-plane wrinkling on tensile property can be neglected and compressive property decrease slightly. However,tensile and compressive properties are very sensitive to in-plane buckling. Their modulus,strength and failure mode change significantly,as WR increases. It is indicated that the type of fiber waviness is very important for evaluating this kind of defect.
引文
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[12]Hormann S,Viechtbauer C,Adumitroaie A,et al. The effect of fiber waviness as manufacturing defect on the fatigue life of CFRP materials[C]//20th International Conference on Composite Materials.Copenhagen:2015.
[13]Bogetti T A,Gillespie J W,Lamontia M A. Influence of ply waviness on the stiffness and strength reduction on composite laminates[J]. Current Gastroenterology Reports,1992,10(1):937-942.
[14]Chun H J,Shin J Y,Daniel I M. Effects of material and geometric nonlinearities on the tensile and compressive behavior of composite materials with fiber waviness[J]. Composites Science&Technology,2001,61(1):125-134.
[15]Lerman M W,Cairns D S,Nelson J W. Investigation of the effect of in-plane fiber waviness in composite materials through testing and finite element modeling[C]//CAMX 2015-Composites and Advanced Materials Expo. Dallas,United states:2015:1269-1285.
[2]Potter K,Khan B,Wisnom M,et al. Variability,fibre waviness and misalignment in the determination of the properties of composite materials and structures[J]. Composites:Part A,2008,39(9):1343-1354.
[3]徐春广,王洪博,肖定国.大型曲面复合材料超声检测技术[J].纤维复合材料,2013(3):33-38.
[4]Wang L. Effects of in-plane fiber waviness on the static and fatigue strength of fiberglass[D]. Montana State University-bozeman,2001.
[5]Lerman M W. Investigation of the effect of in-plane fiber waviness in composite materials through multiple scales of testing and finite element modeling[D]. Montana State University-Bozeman,College of Engineering,2015.
[6] Wang J,Potter K,Hazra K,et al. Experimental fabrication and characterization of out-of-plane fiber waviness in continuous fiber-reinforced composites[J]. Journal of Composite Materials,2011,46(17):2041-2053.
[7]Allison B D,Evans J L. Effect of fiber waviness on the bending behavior of S-glass/epoxy composites[J]. Materials&Design,2012,36:316-322.
[8]吴维清,朱俊,王继辉,等.波纹缺陷对复合材料层合板压缩力学性能影响研究[J].玻璃钢/复合材料,2015(9):87-92.
[9] Jumahat A,Soutis C,Jones F R,et al. Fracture mechanisms and failure analysis of carbon fibre/toughened epoxy composites subjected to compressive loading[J]. Composite Structures,2010,92(2):295-305.
[10]Wang J,Potter K D,Wisnom M R,et al. Failure mechanisms under compression loading in composites with designed out-of-plane fibre waviness[J]. Plastics,Rubber and Composites,2013,42(6):231-238.
[11]Mukhopadhyay S,Hallett S R. Fatigue of out-of-plane fibre waviness defects:experimental and numerical study[C]//20th International Conference on Composite Materials. Copenhagen:2015.
[12]Hormann S,Viechtbauer C,Adumitroaie A,et al. The effect of fiber waviness as manufacturing defect on the fatigue life of CFRP materials[C]//20th International Conference on Composite Materials.Copenhagen:2015.
[13]Bogetti T A,Gillespie J W,Lamontia M A. Influence of ply waviness on the stiffness and strength reduction on composite laminates[J]. Current Gastroenterology Reports,1992,10(1):937-942.
[14]Chun H J,Shin J Y,Daniel I M. Effects of material and geometric nonlinearities on the tensile and compressive behavior of composite materials with fiber waviness[J]. Composites Science&Technology,2001,61(1):125-134.
[15]Lerman M W,Cairns D S,Nelson J W. Investigation of the effect of in-plane fiber waviness in composite materials through testing and finite element modeling[C]//CAMX 2015-Composites and Advanced Materials Expo. Dallas,United states:2015:1269-1285.