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含富树脂缺陷碳纤维/环氧树脂复合材料拉伸性能及失效机理

葛立立 俞鸣明 方琳 刘雪强 任慕苏 孙晋良

葛立立, 俞鸣明, 方琳, 等. 含富树脂缺陷碳纤维/环氧树脂复合材料拉伸性能及失效机理[J]. 复合材料学报, 2021, 39(0): 1-12
引用本文: 葛立立, 俞鸣明, 方琳, 等. 含富树脂缺陷碳纤维/环氧树脂复合材料拉伸性能及失效机理[J]. 复合材料学报, 2021, 39(0): 1-12
Lili GE, Mingming YU, Lin FANG, Xueqiang LIU, Musu REN, Jinliang SUN. Tensile properties and failure mechanism of carbon fiber reinforced epoxy composite with resin rich defects[J]. Acta Materiae Compositae Sinica.
Citation: Lili GE, Mingming YU, Lin FANG, Xueqiang LIU, Musu REN, Jinliang SUN. Tensile properties and failure mechanism of carbon fiber reinforced epoxy composite with resin rich defects[J]. Acta Materiae Compositae Sinica.

含富树脂缺陷碳纤维/环氧树脂复合材料拉伸性能及失效机理

基金项目: 上海市优秀学术/技术带头人计划(No.20XD1434300);广东省重点研发计划(No.2019B010929001);
详细信息
    通讯作者:

    俞鸣明,博士,副研究员,硕士生/博士生导师,研究方向为碳纤维增强复合材料  E-mail: mmyu@shu.edu.cn

  • 中图分类号: TB332

Tensile properties and failure mechanism of carbon fiber reinforced epoxy composite with resin rich defects

  • 摘要: 对含有因局部纤维断裂形成的富树脂缺陷的碳纤维/环氧树脂复合材料拉伸性能进行研究,分析缺陷位置与试样拉伸性能的对应关系发现:当富树脂缺陷大小相同位置不同,拉伸强度从高到低分别是:缺陷位于试样1/3处,缺陷位于试样几何中心时,缺陷位于试样1/2处的边缘时。当缺陷位于同一位置时,拉伸强度随缺陷尺寸的增大而降低。通过计算机断层扫描技术(CT)检测缺陷实际尺寸位置,采用有限元仿真技术建立含缺陷的碳纤维/环氧树脂复合材料拉伸强度性能预测模型,预测结果与实验值的误差小于10%,说明了该有限元模型的可靠性。结合模拟结果分析复合材料的失效机理。

     

  • 图  1  碳纤维/环氧树脂复合材料中富树脂缺陷形貌:富树脂处截面显微图(a)富树脂缺陷SEM图(b)

    Figure  1.  Morphology of resin-rich defect in carbon fiber reinforced epoxy composite: Section micrograph of resin-rich defect (a), SEM image of resin-rich defect (b)

    图  2  碳纤维/环氧树脂复合材料中缺陷的CT扫描正视图与俯视图(a)缺陷裁剪设计示意图(b)

    Figure  2.  Front view(a) and top view(b) of CT scan of defects in carbon fiber reinforced epoxy composite

    图  3  碳纤维/环氧树脂复合材料中缺陷尺寸CT扫描结果与设计值:缺陷孔径CT检测结果与设计值(a)缺陷孔厚CT检测结果与设计值(b)缺陷埋深CT检测结果与设计值(c)缺陷尺寸CT检测结果与设计值的误差(d)

    Figure  3.  CT scanning results and design values of defect size in carbon fiber reinforced epoxy composite: CT detection results and design values of defect diameter (a), CT detection results and design values of defect hole thickness (b), CT detection results and design value of defect buried depth (c), Error between CT detection result and design value of defect size (d)

    图  4  粘贴加强片的碳纤维/环氧树脂复合材料拉伸试样

    Figure  4.  Tensile samples of carbon fiber reinforced epoxy composite with stiffener attached

    图  5  碳纤维/环氧树脂复合材料2#试样有限元模型图:有限元模型部件图(a)网格划分图(b)载荷施加图(c)铺层方向示意图(d)

    Figure  5.  Finite element model diagram of 2# sample of carbon fiber reinforced epoxy composite: Finite element model component diagram (a), Mesh division diagram (b), Load application diagram (c), Schematic diagram of paving direction (d)

    图  6  含缺陷碳纤维/环氧树脂复合材料拉伸强度实验值和模拟值:(a) 1#试样实验结果与模拟结果的位移-载荷曲线图;(b) 1#-7#试样拉伸强度实验值和模拟值及实验值和模拟值之间的误差

    Figure  6.  Experimental and simulated values of tensile strength of carbon fiber reinforced epoxy composite with defects: (a) Displacement-load curve of 1# sample experimental results and simulation results;(b) Experimental value and simulation value of tensile strength of sample 1#-7# and error between test value and simulation value

    图  7  碳纤维/环氧树脂复合材料1#-7#试样拉伸强度降低率

    Figure  7.  Reduction rate of tensile strength of 1#-7# sample of carbon fiber reinforced epoxy composite

    图  8  碳纤维/环氧树脂复合材料1#-7#试样缺陷位置与断裂位置示意图

    Figure  8.  Schematic diagram of defect location and fracture location of 1#-7# sample of carbon fiber reinforced epoxy composite

    图  9  碳纤维/环氧树脂复合材料1#-7#试样拉伸破坏模式

    Figure  9.  Tensile failure mode of 1#-7# sample of carbon fiber reinforced epoxy composite

    图  10  碳纤维/环氧树脂复合材料2#试样拉伸断口SEM图:(a-d)距缺陷分别为0.5 mm、1.5 mm、2 mm和2.5 mm的四个位置的SEM图;(e-f)图(a-d)中横向纤维断裂和纤维束拔出断裂SEM图;(g-h)图(d)中横向纤维处与轴向纤维处的SEM图

    Figure  10.  SEM images of tensile fracture of 2# sample of carbon fiber reinforced epoxy composite: (a-d) The four positions with a distance of 0.5 mm, 1.5 mm, 2 mm and 2.5 mm from the defect respectively;(e-f) Transverse fiber fracture and fiber bundle pull-out fracture in Figure (a-d);(g-h) Transverse fiber and the axial fiber in Fig.(d)

    表  1  碳纤维/环氧树脂复合材料1#-7#试样中缺陷描述和各试样的图标

    Table  1.   Description of defects in 1#-7# sample of carbon fiber reinforced epoxy composite and icons of each sample

    NumberingDefect descriptionDefect diagram
    1#A circular defect ofφ2mm at the geometric center of the sample
    2#A circular defect ofφ4mm at the geometric center of the sample
    3#Semi-circular defect of φ4 mm at the center of one side of the sample
    4#A circular defect of φ4 mm at the center of one side of the sample
    5#A circular defect of φ2 mm located at 1/3 of the sample
    6#A circular defect of φ4 mm located at 1/3 of the sample
    7#No defects
    下载: 导出CSV

    表  2  环氧树脂模拟参数

    Table  2.   Simulation parameters of epoxy resin

    PropertyValue
    Young’s modulus /GPa3.78
    Poisson’s ratio0.38
    Tensile strength/MPa80
    Compressive strength/MPa247
    Shear strength/MPa58
    下载: 导出CSV

    表  3  环氧树脂塑性段数据

    Table  3.   Data of plastic section of epoxy resin

    Yield Stress/GPaPlastic Strain
    10.199770
    20.297680.0024741
    30.39560.01144
    40.501670.32359
    50.60230.080176
    60.697490.17182
    70.798120.32922
    80.904190.59919
    90.955870.79942
    101.00211.0046
    下载: 导出CSV

    表  4  碳纤维/环氧树脂复合材料模拟参数

    Table  4.   Simulation parameters of carbon fiber reinforced epoxy composite

    PropertyValue
    Meridional Young's modulus (E1)/GPa68
    Latitudinal Young's modulus (E2)/GPa66
    Transverse young's modulus (E3)/GPa42
    Poisson's ratio0.25
    In-plane shear modulus (G12=G13)/GPa5.4
    Out-plane shear modulus (G23)/GPa4.5
    Longitudinal tensile strength/MPa686
    Longitudinal compressive strength/MPa401
    Transverse tensile strength/MPa610
    Transverse compressive strength/MPa400
    Longitudinal shear strength/MPa117
    Transverse shear strength/MPa117
    下载: 导出CSV

    表  5  含缺陷碳纤维/环氧树脂复合材料拉伸强度实验值与模拟值

    Table  5.   Experimental and simulated values of tensile strength of carbon fiber reinforced epoxy composite with defects

    Numbering1#2#3#4#5#6#7#
    Experimental tensile strength/MPa644.5576.8668.3598.2638.7478.7697.1
    Simulated tensile strength/MPa693.1612.9717.6648.1708.1507.4742.8
    下载: 导出CSV

    表  6  碳纤维/环氧树脂复合材料1#-7#试样应力应变分布云图

    Table  6.   Stress and strain distribution patterns of 1#-7# sample of carbon fiber reinforced epoxy composite

    Defect diagram
    stress and strain distribution pattern
    stress distribution
    strain distribution
    stress distribution
    strain distribution
    stress distribution
    strain distribution
    stress distribution
    strain distribution
    stress distribution
    strain distribution
    stress distribution
    strain distribution
    stress distribution
    strain distribution
    下载: 导出CSV
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出版历程
  • 收稿日期:  2021-09-15
  • 录用日期:  2021-11-10
  • 修回日期:  2021-10-18
  • 网络出版日期:  2021-12-01

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