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A fast and efficient numerical prediction of compression after impact (CAI) strength of composite laminates and structures

机译：复合材料层压板和结构的冲击后压缩（CAI）强度的快速高效数值预测

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摘要

In this paper, an equivalent damage model is proposed to quickly predict the compression after impact (CAI) strength of composite laminates and stiffened panels. Low-velocity impact (LVI) and CAI tests at various energy levels are carried out on laminates. Based on the measured impact damage sizes, the model simplifies the damage area into concentric circles with different stiffness and strength properties by adopting the soft inclusion method. Progressive failure analysis and virtual crack closure technique (VCCT) are used to simulate the intra-laminar and inter-laminar failure of impacted laminates under axial compression in commercial finite element software ABAQUS. The predicted failure modes and CAI strength of laminates are in good agreement with the experiment results from this paper and the literature at various impact energies, which proves the validity of the model. Whilst the numerical model achieves high computational efficiency, the effect of mass scaling on computational efficiency and accuracy is evaluated, which provides a reference for the parameter choice in engineering application. The model is further applied to predict the compressive failure load of the stiffened composite panel with skin bay impact damage as a practical application, showing this modelling approach is also suitable to composite structures.
机译：在本文中，提出了等效损伤模型来快速预测复合材料层压板和加劲板的冲击后压缩（CAI）强度。在层压板上进行了各种能级下的低速冲击（LVI）和CAI测试。基于测得的冲击损伤尺寸，该模型通过采用软夹杂法将损伤区域简化为具有不同刚度和强度特性的同心圆。在商业有限元软件ABAQUS中，使用渐进式失效分析和虚拟裂纹闭合技术（VCCT）来模拟受压层压板在轴向压缩下的层内和层间破坏。预测的层合破坏模式和CAI强度与本文和文献在不同冲击能量下的实验结果吻合良好，证明了该模型的有效性。在数值模型获得较高计算效率的同时，评估了质量缩放对计算效率和精度的影响，为工程应用中的参数选择提供参考。该模型在实际应用中被进一步应用于预测加劲复合板在遭受蒙皮海湾冲击破坏时的压缩破坏载荷，这表明该建模方法也适用于复合结构。

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  • 来源
    《Thin-Walled Structures》 |2020年第3期|106588.1-106588.11|共11页
  • 作者

  • 作者单位

    Beihang Univ Sch Aeronaut Sci & Engn Beijing 100191 Peoples R China;

    Beihang Univ Sch Aeronaut Sci & Engn Beijing 100191 Peoples R China|Third Acad CASIC Unmanned Aerial Vehicle Technol Inst Beijing 100074 Peoples R China;

  • 收录信息 美国《科学引文索引》(SCI);美国《工程索引》(EI);
  • 原文格式 PDF
  • 正文语种 eng
  • 中图分类
  • 关键词

    Composite laminate; Impact damage; CAI strength; Finite element analysis; Stiffened panel;

    机译：复合层压板;冲击破坏;CAI强度;有限元分析;加筋板;

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