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倾斜胞壁Nomex蜂窝芯压剪复合力学响应

赵志勇 袁昊 刘闯 李玉军 孙立帅 王俊彪

赵志勇, 袁昊, 刘闯, 等. 倾斜胞壁Nomex蜂窝芯压剪复合力学响应[J]. 复合材料学报, 2022, 39(0): 1-9
引用本文: 赵志勇, 袁昊, 刘闯, 等. 倾斜胞壁Nomex蜂窝芯压剪复合力学响应[J]. 复合材料学报, 2022, 39(0): 1-9
Zhiyong ZHAO, Hao YUAN, Chuang LIU, Yujun LI, Lishuai SUN, Junbiao WANG. Mechanical response of inclined Nomex honeycombs under combined shear-compression loads[J]. Acta Materiae Compositae Sinica.
Citation: Zhiyong ZHAO, Hao YUAN, Chuang LIU, Yujun LI, Lishuai SUN, Junbiao WANG. Mechanical response of inclined Nomex honeycombs under combined shear-compression loads[J]. Acta Materiae Compositae Sinica.

倾斜胞壁Nomex蜂窝芯压剪复合力学响应

基金项目: 国家自然科学基金(11902256);陕西省自然科学基金(2019JQ-479)
详细信息
    通讯作者:

    刘闯,博士,副教授,硕士生导师,研究方向为复合材料数字化制造 E-mail:Liuchuang@mail.nwpu.edu.cn

  • 中图分类号: TB332

Mechanical response of inclined Nomex honeycombs under combined shear-compression loads

  • 摘要: 成形具有一定曲率的夹层结构时,需要将蜂窝芯铣削成曲面形状,造成蜂窝胞壁呈一定倾角,进而降低蜂窝夹芯结构面外承载能力。为了定量化分析面外载荷作用下倾斜胞壁蜂窝芯的力学性能,建立了倾斜胞壁蜂窝芯面外压剪复合有限元模型,并通过设计专用Arcan夹具实现蜂窝芯的面外压剪复合加载,用于验证模型的有效性。对比仿真与实验结果,发现蜂窝芯压剪响应及胞壁变形模式吻合较好。利用验证的有限元模型对胞壁倾角范围为0°~40°的蜂窝芯在面外压剪复合载荷下的力学响应进行了研究,结果表明随着蜂窝胞壁倾角的增大,蜂窝芯面外承载能力逐渐降低;当胞壁倾斜角由0°增加到40°,初始应力峰值下降最大的幅度为47.7%,平原阶段强度下降的幅度为29%;进一步分析了倾斜胞壁蜂窝芯截面芯格尺寸与胞壁倾角的几何关系,将倾斜胞壁蜂窝芯等效为具有相同截面尺寸的垂直胞壁蜂窝芯,推导了倾斜胞壁蜂窝芯在面外压缩及剪切载荷作用下的坍塌强度,揭示了胞壁倾角对蜂窝芯坍塌强度影响机理。

     

  • 图  1  倾斜胞壁Nomex蜂窝芯几何构型示意图

    Figure  1.  Schematic representation of the inclined Nomex honeycomb

    L—Length of the honeycomb; W—Width of the honeycomb; H—Hight of the honeycomb; F—Out-of-plane load; FN—Normal load; FS—Shear load; φ—Loading angle; h—Vertical cell wall length; l—Inclined cell wall length; ω—Inclined angle

    图  2  蜂窝芯压剪复合试验装置

    Figure  2.  Test set-up of a honeycomb core under combined shear-compression loading

    图  3  倾斜胞壁Nomex蜂窝芯压剪复合模型及边界条件

    Figure  3.  Combined shear-compression finite element model and boundary condition of the inclined Nomex honeycomb

    图  4  0°胞壁倾角蜂窝芯实验与数值模拟应力-位移曲线对比

    Figure  4.  Experimental and numerical crushing responses under quasi-static combined shear-compression for honeycomb with ω=0°

    图  5  0°胞壁倾角蜂窝芯实验与数值模拟初始峰值应力及平原阶段强度对比

    Figure  5.  Comparison of initial peak stress and plateau stage strength between experiment and numerical simulation for honeycomb with ω=0°

    图  6  0°胞壁倾角蜂窝芯实验与数值模拟胞壁变形对比

    Figure  6.  Comparison of the deformation modes between the experiment and simulation for honeycomb with ω=0°

    图  7  蜂窝的变形模式示意图

    Figure  7.  Schematic of the deformation modes for honeycomb

    图  8  不同胞壁倾斜角蜂窝结构在15°加载角下的应力-位移曲线

    Figure  8.  Crushing responses of inclined honeycomb at different inclined angle under the loading angle $\phi $=15°

    图  9  加载角度及蜂窝倾角对蜂窝芯初始峰值力及平原阶段强度影响

    Figure  9.  Loading angle and inclined angle effects on the initial peak stress and plateau stage strength for honeycomb

    图  10  加载角度及蜂窝倾角对蜂窝芯变形的影响(蜂窝芯位移为0.2 mm)

    Figure  10.  Loading angle and inclined angle effects on the deformation of honeycomb (Displacement of honeycomb is 0.2 mm)

    图  11  L方向剪切应力作用下蜂窝壁对应的剪切力流

    Figure  11.  Shear force flow in honeycomb cell when loaded in the L direction

    τ32—Shear stress; Qa—Vertical cell wall shear flow; QbQc—Inclined cell wall shear flow

    图  12  不同胞壁倾斜蜂窝芯截面变化

    Figure  12.  Cross sections of inclined honeycomb at different inclined angles

    θ—Angle between inclined cell wall and horizontal

    图  13  蜂窝胞壁倾角ω对芯格斜边尺寸li及夹角θi影响

    Figure  13.  Effect of inclined angle ω on the cell wall length li and angle θi

    图  14  倾斜胞壁蜂窝芯等效处理

    Figure  14.  Equivalent of inclined cell wall honeycomb

    图  15  胞壁倾角对倾斜胞壁蜂窝芯坍塌应力与垂直胞壁蜂窝芯坍塌应力比值的影响

    Figure  15.  Effect of inclined angle on the ratio about the collapse stress of inclined cell wall honeycomb to the vertical cell wall honeycomb

    表  1  蜂窝胞壁的材料属性

    Table  1.   Material properties of the honeycomb cell wall

    Elastic propertyValueYield propertyValue
    EMD/MPa5000.0σMD/MPa115.0
    ECD /MPa3500.0σCD/MPa105.0
    G12/MPa520.0σ12/MPa72.0
    υ0.2
    Notes: EMD and EMD are the Young’s modulus in machine direction and cross machine direction; G12 is the shear modulus; υ is the Poisson’s ratio; σMD and σCD are the tensile yield strength in machine direction and cross machine direction; σ12 is the shear yield strength.
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  • 收稿日期:  2021-11-24
  • 录用日期:  2022-01-18
  • 修回日期:  2022-01-10
  • 网络出版日期:  2022-02-16

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