航空学报 > 2021, Vol. 42 Issue (2): 224231-224231   doi: 10.7527/S1000-6893.2020.24231

缝合复合材料T型接头拉伸载荷下的有限元数值模拟

文立伟, 余坤, 宦华松   

  1. 南京航空航天大学 材料科学与技术学院, 南京 210016
  • 收稿日期:2020-05-15 修回日期:2020-06-16 发布日期:2020-08-31
  • 通讯作者: 文立伟 E-mail:wenliwei@nuaa.edu.cn
  • 基金资助:
    国防基础科研计划(JCKY2019204A001);上海航天科技创新基金(SAST2019-117)

Finite element numerical simulation of stitched composite T-joint under tensile load

WEN Liwei, YU Kun, HUAN Huasong   

  1. College of Materials Science and Technology, Nanjing University of Aeronautics and Astronautics, Nanjing 210016, China
  • Received:2020-05-15 Revised:2020-06-16 Published:2020-08-31
  • Supported by:
    Defense Industrial Technology Development Program (JCKY2019204A001);Shanghai Aerospace Science and Technology Innovation Foundation(SAST2019-117)

摘要: 利用ABAQUS软件对拉伸载荷下的缝合T型接头进行建模与分析,采用基于内聚力模型(CZM)的黏聚接触方法来模拟筋条与蒙皮的脱粘行为,以基于细观力学的非线性弹簧模拟缝线在上下界面的增强作用。在模型基础上对缝线直径进行参数化分析,研究其对T型接头拉伸性能的影响。结果表明:随缝线直径增大,接头极限破坏载荷提高,即拉伸承载能力提高。有限元分析结果与试验值吻合较好。值得注意的是,当缝线直径增大到1 500旦尼尔时,模拟结果与试验数据存在10.4%的误差,这是因为模型未考虑缝合对层合板面内性能的影响,忽略了缝线可能造成的材料损伤。考虑到T型接头在拉伸载荷作用下的破坏模式主要是I型和Ⅱ型破坏,因此宜采用二维有限元模型进行参数化分析,计算效率高并且与试验结果吻合较好。

关键词: 有限元, 缝合, 复合材料, T型接头, 拉伸载荷

Abstract: Software ABAQUS is used to model and analyze the stitched T-joint under tensile load. The cohesive contact method based on the Cohesive Zone Model (CZM) is adopted to simulate the debonding behavior of the stiffener flange and skin. The reinforcement effect of stitching at the interface is simulated with the nonlinear spring element based on mesomechanics. On the basis of finite element model, the influence of stitching on tensile properties of the T-joint is studied by parametric analysis. Results show that the ultimate failure load increases with the increase of the thread diameter. That is, the tensile bearing capacity improves. The analysis results of the finite element method are in good agreement with the experimental values. It is worth noting that there is a 10.4% deviation between the simulation results and the experimental values when the thread diameter increases to 1 500 denier, because the model does not consider the effect of stitching on the in-plane performance and ignores the possible damage caused by stitching. Since the failure modes of the T-joint under tensile load are mainly Type I and Type Ⅱ failures, it is advisable to use two-dimensional finite element model for parametric analysis for its high calculation efficiency and good agreement with the test results.

Key words: finite element, stitching, composites, T-joint, tensile load

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