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RTM成型非对称复合材料T型接头的拉伸失效机理

王帅 陈梦熊 李伟东 罗楚养 潘利剑

王帅, 陈梦熊, 李伟东, 等. RTM成型非对称复合材料T型接头的拉伸失效机理[J]. 复合材料学报, 2022, 39(0): 1-12
引用本文: 王帅, 陈梦熊, 李伟东, 等. RTM成型非对称复合材料T型接头的拉伸失效机理[J]. 复合材料学报, 2022, 39(0): 1-12
Shuai WANG, Mengxiong CHEN, Weidong LI, Chuyang LUO, Lijian PAN. Tensile failure mechanism of RTM-made asymmetric composite T-joint[J]. Acta Materiae Compositae Sinica.
Citation: Shuai WANG, Mengxiong CHEN, Weidong LI, Chuyang LUO, Lijian PAN. Tensile failure mechanism of RTM-made asymmetric composite T-joint[J]. Acta Materiae Compositae Sinica.

RTM成型非对称复合材料T型接头的拉伸失效机理

基金项目: 航空科学基金 (20180112008);青年人才托举工程 (2016QNRC001);上海市科技创新行动计划项目 (19DZ1100300)
详细信息
    通讯作者:

    罗楚养,博士,高级工程师,研究方向为复合材料结构设计 E-mail: cyluo@dh.edu.cn

  • 中图分类号: TB332; V214.8

Tensile failure mechanism of RTM-made asymmetric composite T-joint

  • 摘要: 采用树脂传递模塑(RTM)工艺制备了结构对称和非对称两种复合材料T型接头试样,并对其进行了静态拉伸力学试验,对比分析了两种结构的拉伸破坏模式、结构刚度及破坏载荷。同时基于T接头内聚力模型(CZM),研究了两种不同结构T型接头的拉伸破坏过程及失效机理,并对比分析了不同偏转角下T接头的层间应力。结果表明:不同结构T型接头的拉伸破坏模式不同,偏转角的存在使结构非对称T型接头夹角大侧圆弧受力明显高于小侧圆弧,导致接头首先在大侧夹角圆弧与三角区界面定向萌生初始裂纹,随后裂纹主要沿大侧腹板翻边与蒙皮的界面扩展,进而导致接头最终破坏,最终失效载荷较对称T型接头提高了15.3 %,且结构刚度更大。有限元结果表明T型接头三角区的初始失效主要由层间正应力及剪应力引起,有限元分析的失效模式与试验一致,结构对称及非对称T型接头最终失效载荷与试验值均吻合较好;且随着偏转角的增加,腹板圆弧处层间应力逐渐减小,初始失效载荷将随之增大;初始破坏位置将转移至大侧夹角圆弧末端。

     

  • 图  1  T接头RTM成型示意图

    Figure  1.  Schematic of RTM process of T-joints

    图  2  T型接头几何尺寸:(a) A型(结构对称);(b) B型(结构非对称)

    Figure  2.  Geometry and dimension of T-joints: (a) A-type(Symmetric structure); (b) B-type(Asymmetric structure)

    图  3  T型接头拉伸试验示意图:(a) 试验平台;(b) A型;(c) B型

    Figure  3.  Schematic of tensile test of T-joint: (a) test platform; (b) A-type; (c) B-type

    图  4  T接头内聚力模型:(a) A型;(b) B型

    Figure  4.  Cohesive zone models of T-joint: (a) A-type; (b) B-type

    图  5  内聚力双线性本构模型[24]

    Figure  5.  Cohesive bilinear constitutive model[24]

    图  6  T型接头拉伸载荷-位移曲线

    Figure  6.  Tensile load-displacement curves of T-joints

    图  7  T接头拉伸失效过程:(a) A型;(b) B型

    Figure  7.  Failure process of T-joints: (a) A-type; (b) B-type

    图  8  B型T接头受力模型:(a) 蒙皮弯曲变形示意图;(b) 受力简图;(c) 任意角度内力关系

    Figure  8.  Loading models of B-type T-joint: (a) Schematic of bending deformation; (b) Loading schematic; (c) Internal force relationship at any angle

    图  9  B型T接头θ=15°时轴向力N、剪切力Q、弯矩M随角度ω变化的变化曲线

    Figure  9.  Curves of axial force N, shear force Q and moment M change with angle ω while θ=15° for B-type T-joint

    图  10  不同偏转角θ腹板圆弧处剪力Q1Q2随角度ω变化的曲线

    Figure  10.  Curves of shear force Q change with angle ω under different deflection angle θ

    图  11  T接头仿真拉伸失效过程:(a) A型;(b) B型

    Figure  11.  Simulated failure process of T-joints: (a) A-type; (b) B-type

    图  12  A型T接头初始失效前F=710 N时的应力分布(单位:MPa)

    Figure  12.  Stress distribution under 710 N loading before initial failure of A-type T-joint(Unit: MPa)

    图  13  B型T接头初始失效前F=720 N时的应力分布(单位:MPa)

    Figure  13.  Stress distribution under 720 N loading before initial failure of B-type T-joint(Unit: MPa)

    图  14  B型T接头圆弧层间正应力σ3和剪应力τ13随偏转角θ的变化曲线

    Figure  14.  Curves of interlaminar normal stress σ3 and shear stress τ13 of curved web change with deflection angle θ for B-type T-joint

    图  15  不同偏转角下B型T接头初始破坏位置

    Figure  15.  Initial failure position of B-type T-joints with different deflection angle θ

    表  1  材料力学性能参数

    Table  1.   Mechanical properties of materials

    MaterialE1/GPaE2/GPaE3/GPaν12ν13ν23G12/GPaG13/GPaG23/GPa
    U-8190/5284RTM 156.0 9.0 9.0 0.30 0.15 0.15 4.3 3.5 3.5
    CCF800H/AC531 159.3 8.3 8.3 0.25 0.10 0.10 4.6 3.5 3.5
    Notes: U-8190/5284RTM—Unidirectional carbon fiber fabric reinforced epoxy composite; CCF800H/AC531—Carbon fiber reinforced epoxy prepreg.
    下载: 导出CSV

    表  2  内聚力单元力学参数[20]

    Table  2.   Mechanical properties of cohesive element[20]

    Stiffness/MPaStrength/MPaEnergy release rate/(J·m−2)
    E11 G13 G23 $ {\sigma }_{\text{n}}^{\text{0}} $ $ {\sigma }_{\text{s}}^{\text{0}} $ $ {\sigma }_{\text{t}}^{\text{0}} $ GIC GIIC GIIIC
    3000 1200 1200 15 30 30 580 1900 1900
    下载: 导出CSV

    表  3  T型接头拉伸试验结果与有限元结果

    Table  3.   Experimental and FEA results of T-joints tensile tests

    T-jointCategoryInitial failure load/ NPeak failure load/ N
    AExperiment767952
    975975
    892892
    9411006
    Average894956
    FE936940
    Deviation4.7%1.7%
    BExperiment11211121
    10881088
    8491026
    11721172
    Average10581102
    FE11361136
    Deviation7.4%3.1%
    下载: 导出CSV
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  • 收稿日期:  2021-11-15
  • 录用日期:  2022-01-18
  • 修回日期:  2022-01-09
  • 网络出版日期:  2022-02-16

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