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PBO纤维增强环氧树脂复合材料层间I型断裂韧性的DIC技术测量

杨露 校金友 文立华 张承双 侯晓

杨露, 校金友, 文立华, 等. PBO纤维增强环氧树脂复合材料层间I型断裂韧性的DIC技术测量[J]. 复合材料学报, 2022, 39(0): 1-11
引用本文: 杨露, 校金友, 文立华, 等. PBO纤维增强环氧树脂复合材料层间I型断裂韧性的DIC技术测量[J]. 复合材料学报, 2022, 39(0): 1-11
Lu YANG, Jinyou XIAO, Lihua WEN, Chengshuang ZHANG, Xiao HOU. Mode I interlaminar fracture toughness measurement of PBO fiber reinforced epoxy composites with DIC technology[J]. Acta Materiae Compositae Sinica.
Citation: Lu YANG, Jinyou XIAO, Lihua WEN, Chengshuang ZHANG, Xiao HOU. Mode I interlaminar fracture toughness measurement of PBO fiber reinforced epoxy composites with DIC technology[J]. Acta Materiae Compositae Sinica.

PBO纤维增强环氧树脂复合材料层间I型断裂韧性的DIC技术测量

基金项目: 国家自然科学基金(N2016KD0068);国家自然科学基金委员会-中国航天科技集团有限公司航天先进制造技术研究联合基金(U1837601);青年基金(11902255);重大项目基金(52090051)
详细信息
    通讯作者:

    文立华,博士,教授,博士生导师,研究方向为飞行器复合材料结构设计 E-mail: Lhwen@nwpu.edu.cn

    张承双,博士,研究员,研究方向为先进聚合物基复合材料 E-mail: 3425756@qq.com

  • 中图分类号: TB332

Mode I interlaminar fracture toughness measurement of PBO fiber reinforced epoxy composites with DIC technology

  • 摘要: I型双悬臂梁(DCB)试验通常用于单向复合材料的层间抗拉性能研究,目标是测量I型层间断裂韧性,其可作为复合材料分层扩展及失效机制研究的重要输入参数。在DCB试验中必须经常暂停试验以实现多次测量裂纹长度,这不仅会对裂纹传播产生潜在影响,造成测量误差且多次反复试验的时效性较差。DIC应用于裂纹扩展长度测量具有实时跟踪、精确定位的优点,可有效提高I型断裂韧性试验的测量效率,但应用于非连续变形行为仍存在局限性,且易受到图像噪声的干扰,产生测量误差。本文发展了一种基于DIC测试技术的实时获取裂纹长度的检测方法,通过图像匹配算法获取试件的非连续变形位移场,并提出一种根据全局横向位移离散程度的辨别方法,实现了裂纹尖端的实时捕捉。再通过DCB试验,与传统测量方式对比,裂纹长度的测量误差平均不超过2.76%,验证了该方法的准确性和高效性,同时也克服了PBO/环氧树脂复合材料侧表面毛糙,散斑质量较差以及纤维桥接对测量结果的干扰,最终获取了有效的I型层间断裂韧性初始值及稳态扩展值。

     

  • 图  1  双悬臂梁(DCB)试验原理

    Figure  1.  Principle of double cantilever beam (DCB) test

    图  2  稳态扩展(a)、失稳扩展(b)

    Figure  2.  Stable extension(a)and unstable extension(b)

    图  3  DCB试验装置

    Figure  3.  DCB test device

    图  4  不同时刻的PBO/环氧树脂复合材料纤维桥接区域

    Figure  4.  Fiber bridging region of PBO/epoxy composites at different moments

    图  5  PBO/环氧树脂复合材料试件、碳纤维/环氧树脂复合材料试件表面散斑质量评估

    Figure  5.  Evaluation of speckle quality on specimen surface of PBO/epoxy and carbon fiber/epoxy composites

    图  6  PBO/环氧树脂复合材料横向最大应变

    Figure  6.  Maximum strain in y-direction of PBO/epoxy composite

    图  7  PBO/环氧树脂复合材料DCB试件的DIC位移云图

    Figure  7.  DIC displacement cloud diagram of PBO/epoxy composite DCB specimen

    图  8  PBO/环氧树脂复合材料横向位移标准差分布

    Figure  8.  Standard deviation distribution of lateral displacement

    图  9  PBO/环氧树脂复合材料裂纹尖端的确定方法

    Figure  9.  Determination method of crack tip of PBO/epoxy composite

    图  10  PBO/环氧树脂复合材料裂纹长度的实时测量结果

    Figure  10.  Real-time measurement results of crack length of PBO/epoxy composite

    图  11  PBO/环氧树脂复合材料不同子集大小下的裂纹长度

    Figure  11.  Crack length under different subset sizes of PBO/epoxy composite

    图  12  PBO/环氧树脂复合材料DCB试验的载荷-位移曲线

    Figure  12.  Load-displacement curves of DCB test of PBO/epoxy composite

    图  13  不同测量方法下PBO/环氧树脂复合材料的裂纹扩展长度a随时间变化曲线

    Figure  13.  Variation curve of crack propagation length of PBO/epoxy composite with time under different measurement methods

    图  14  不同测量方法下PBO/环氧树脂复合材料的I型断裂韧性比较

    Figure  14.  Comparison of fracture toughness GI of PBO/epoxy composite under different measurement methods

    表  1  PBO/环氧树脂复合材料不同时刻裂纹长度测量误差

    Table  1.   Crack length measurement error of PBO/epoxy composites at different moments

    Time
    /min
    51015202530Ave
    Magnifying glass71.890.8106.8112.3130.9143.2
    DIC70.087.2104.9115.2126.1138.5
    Deviation
    /%
    1.83.61.72.53.673.282.76
    下载: 导出CSV

    表  2  不同测量方式下PBO/环氧树脂复合材料I型断裂韧性的值

    Table  2.   Mode I fracture toughness of PBO/epoxy composites under different measurement methods

    NumberMethodGI_ initial/
    (N·mm−1)
    GI _stable/
    (N·mm−1)
    Toughening
    01Magnifying glass0.288870.804077278.35%
    01DIC0.288510.910412315.56%
    Deviation0.125%13.22%
    02Magnifying glass0.312080.931708298.55%
    02DIC0.286820.904918315.50%
    Deviation8.09%2.88%
    03Magnifying glass0.302900.744596245.82%
    03DIC0.286580.751677262.29%
    Deviation5.39%0.95%
    下载: 导出CSV
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出版历程
  • 收稿日期:  2021-11-16
  • 录用日期:  2022-01-05
  • 修回日期:  2021-12-25
  • 网络出版日期:  2022-02-12

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