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Numerical investigation of stress states in buckled laminated composite plates under dynamic loading

机译：动载荷作用下复合材料屈曲层合板应力状态的数值研究

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The composite structures of super-/hyper-sonic vehicles can experience thermal or mechanical buckling due to aero-thermal-structural coupling. These buckled structures are susceptible to dynamic snap-through, which could possibly accelerate damage progression. This paper is part of a long-term project investigating structural dynamics and damage progression for composite structures under these extreme environments. The work herein focuses on analyzing the stress histories of thin laminated composite plates under various combinations of structural and forcing conditions including buckling and snap-through. A geometrically nonlinear model is developed in-house using MATLAB by incorporating the first-order shear deformation theory, von Karman strains, and enhanced assumed strain elements. The global dynamic behaviors of this model in the post-buckled regime are first validated using experimental and numerical data. The impacts of buckling and snap-through on the internal stress states are then investigated. The results reveal that composite structures can experience significant stress amplification under such extreme environments. The potential impact of this phenomenon on fatigue is also discussed.
机译：超音速/超音速车辆的复合结构由于空气-热-结构耦合而遭受热或机械屈曲。这些弯曲的结构易受动态咬合的影响，这可能会加速损坏的进程。本文是一项长期项目的一部分，该项目研究了在这些极端环境下复合结构的结构动力学和损伤进展。本文的工作着重于分析结构和受力条件（包括屈曲和咬合）的各种组合下的薄层压复合板的应力历史。通过结合一阶剪切变形理论，von Karman应变和增强的假定应变元素，使用MATLAB在内部开发了几何非线性模型。首先使用实验和数值数据验证了该模型在后屈曲状态下的整体动力学行为。然后研究了屈曲和突跳对内部应力状态的影响。结果表明，在这种极端环境下，复合材料结构会经历明显的应力放大。还讨论了这种现象对疲劳的潜在影响。

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