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双轴经编织物膜梯形撕裂扩展机制及其拉剪耦合行为

陈建稳 马俊杰 赵兵 陈务军

陈建稳, 马俊杰, 赵兵, 等. 双轴经编织物膜梯形撕裂扩展机制及其拉剪耦合行为[J]. 复合材料学报, 2023, 40(12): 6922-6933. doi: 10.13801/j.cnki.fhclxb.20230328.002
引用本文: 陈建稳, 马俊杰, 赵兵, 等. 双轴经编织物膜梯形撕裂扩展机制及其拉剪耦合行为[J]. 复合材料学报, 2023, 40(12): 6922-6933. doi: 10.13801/j.cnki.fhclxb.20230328.002
CHEN Jianwen, MA Junjie, ZHAO Bing, et al. Trapezoidal tearing propagation mechanisms of biaxial-warp-knitted fabric composites and tensile-shear coupling behaviors involved[J]. Acta Materiae Compositae Sinica, 2023, 40(12): 6922-6933. doi: 10.13801/j.cnki.fhclxb.20230328.002
Citation: CHEN Jianwen, MA Junjie, ZHAO Bing, et al. Trapezoidal tearing propagation mechanisms of biaxial-warp-knitted fabric composites and tensile-shear coupling behaviors involved[J]. Acta Materiae Compositae Sinica, 2023, 40(12): 6922-6933. doi: 10.13801/j.cnki.fhclxb.20230328.002

双轴经编织物膜梯形撕裂扩展机制及其拉剪耦合行为

doi: 10.13801/j.cnki.fhclxb.20230328.002
基金项目: 国家自然科学基金项目(51608270);江苏省基础研究计划(自然科学基金)资助项目(BK20191290);中央高校基本科研业务费专项资金资助(30920021143);中国博士后科学基金资助项目(2017T100371)
详细信息
    通讯作者:

    陈建稳,博士,副教授,硕士生导师,研究方向为轻型空间结构、薄膜结构 E-mail: Jianwench@yeah.net

  • 中图分类号: TB332;TS186.1

Trapezoidal tearing propagation mechanisms of biaxial-warp-knitted fabric composites and tensile-shear coupling behaviors involved

Funds: National Natural Science Foundation of China (51608270); Fundamental Research Program of Jiangsu Province (BK20191290); Fundamental Research Funds for the Central Universities (30920021143); China Postdoctoral Science Foundation (2017T100371)
  • 摘要: 针对经编织物类膜材,考虑纱线方向性及其细观力学结构,进行了系列纱线偏转(梯度15°)及裂缝参数下梯形撕裂试验及数值研究,探讨了撕裂强度及力学行为受参数影响规律,论证了裂纹扩展机制及其涉及的拉剪耦合行为特征。结果表明:裂缝扩展与主纱应力三角区及X形剪应力区的衍变存在显著关联,并据此可界定撕裂历程中各典型阶段。经纬纱间的协同变形及材料的拉剪耦合作用是材料撕裂性能表现出纱线方向依赖性的主要诱因,且随偏角趋于45°两因素均呈现出规律性变化,进而造成裂纹两向杂糅延展及撕裂抗力的“山脊”式变化规律的呈现。所得结论可为相关织物膜材的损伤分析及膜结构安全性评估提供有益参考。

     

  • 图  1  聚偏氟乙烯 (PVDF) 织物膜材细观结构示意图(a)与SEM图像(b)

    Figure  1.  Detailed structure (a) and SEM cross-sectional image (b) of polyvinylidene fluoride (PVDF) fabric material

    图  2  PVDF膜材偏轴撕裂试样尺寸图

    Figure  2.  Dimension of PVDF fabric specimen used in trapezoidal off-axis tearing

    θ—Off-axis angle

    图  3  PVDF膜材纱线应力-应变关系模型

    Figure  3.  Stress-strain relationship model for yarns in PVDF fabric

    图  4  模型边界条件

    Figure  4.  Boundary conditions of the model

    图  5  PVDF膜材典型梯形偏轴撕裂历程

    Figure  5.  Typical trapezoidal off-axis tearing process of PVDF fabric

    图  6  PVDF膜材典型偏轴角15° (a) 与30° (b) 时数值撕裂历程

    Figure  6.  Numerical tearing process of PVDF fabric at typical off-axis angles of 15° (a) and 30° (b)

    A—Tear oblique triangle; B—Membrane of fold

    图  7  PVDF膜材各偏轴角下撕裂强力-位移曲线试验与数值结果对比

    Figure  7.  Comparison of experimental and numerical results of tearing strength-displacement curves for PVDF fabric at different off-axis angles

    RSDx°—Relative standard deviation with off-axis angle of x°

    图  8  偏轴角15° (a)、30° (b)及45° (c)下PVDF膜材数值模型Mises应力与剪应力云图

    Figure  8.  Mises stress and shear stress contours for models of PVDF fabric at typical off-axis angles of 15° (a), 30° (b) and 45° (c)

    图  9  PVDF膜材数值模型梯形撕裂历程剪应力4个典型特征段

    Figure  9.  Four typical trapezoidal tearing stages of the model of PVDF fabric according to their shear stress distribution

    图  10  PVDF膜材典型梯形撕裂历程应力云图

    Figure  10.  Stress contours of the typical trapezoidal tearing process for PVDF fabric

    图  11  不同偏轴角下PVDF膜材数值模型撕裂强力(a)及主纱剪切力(b)随位移演变曲线(15 mm)

    Figure  11.  Tearing strength-displacement (a) and shear force-displacement curves (b) of the 15 mm model of PVDF fabric with different off-axis angles

    图  12  撕裂临界时PVDF膜材数值模型切缝邻域经纬纱线剪应力

    Figure  12.  Shear stress of warp and weft yarns in the vicinity of the crack in the model of PVDF fabric at the time of tearing

    图  13  各偏角下PVDF膜材数值模型撕裂抗力与剪切力

    Figure  13.  Tearing strength and shear force for models of PVDF fabric at different off-axis angles

    图  14  不同切缝长度下PVDF膜材数值模型撕裂抗力 (a) 与剪切力 (b) 对比

    Figure  14.  Comparison of tearing strength (a) and shear force (b) for models of PVDF fabric with different crack lengths

    图  15  不同切缝长度下PVDF膜材数值模型临撕裂时切缝邻域应力

    Figure  15.  Stress in the vicinity of the crack at the time of tearing in the model of PVDF fabric with different crack lengths

    图  16  系列偏角下PVDF膜材数值模型经纬纱裂缝扩展期的应力三角区拉伸 (a) 及剪切 (b) 承载力

    Figure  16.  Tensile (a) and shear (b) force of warp and weft yarns in the delta zone of the model of PVDF fabric at the tearing extension stage with different off-axis angles

    表  1  PVDF膜材纱线力学参数

    Table  1.   Mechanical parameters for yarns in PVDF fabric

    YarnStrain/%Modulus/MPa
    εIεIIεIIIEIEIIEIII
    Warp 0.02 9.00 18.00 4909.32 971.20 3196.41
    Weft 3.00 15.50 27.00 3246.33 851.52 2477.14
    Notes: εI, εII, εIII—Strain for three characteristic stages; EI, EII, EIII—Elastic modulus for three characteristic stages.
    下载: 导出CSV

    表  2  模型边界参数

    Table  2.   Boundary parameters of model

    Step Model boundary Settings of displacement boundaryRegion
    Step-1BC-1U2=30 mm; U1=UR2=U3=UR1=UR3=0SET-1
    BC-2UR2=0.523; U1=U2=U3=UR1=UR3=0RP-1
    BC-3UR2=−0.523; U1=U2=U3=UR1=UR3=0RP-2
    Step-2BC-4ENCASTRESET-2
    BC-5U3=100 mm; U1=UR2=U3=UR1=UR3=0SET-3
    Note: U, UR—Boundary displacement parameters.
    下载: 导出CSV
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  • 收稿日期:  2022-12-29
  • 修回日期:  2023-03-06
  • 录用日期:  2023-03-17
  • 网络出版日期:  2023-03-28
  • 刊出日期:  2023-12-01

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