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首页> 外文期刊>Proceedings of the Institution of Civil Engineers >Mechanical models for local buckling of metal sandwich panels
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Mechanical models for local buckling of metal sandwich panels

机译：金属夹心板局部屈曲的力学模型

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摘要

Modern design methods for sandwich panels must attempt to maximise the potential of such systems for weight reduction, thus achieving highly optimised structural components. A successful design method for large-scale sandwich panels requires the consideration of every possible failure mode. An accurate prediction of the various failure modes is not only necessary but it should also utilise a simple approach that is suitable for practical application. To fulfil these requirements, a mechanics-based approach is proposed in this paper to assess local buckling phenomena in sandwich panels with metal cores. This approach employs a rotational spring analogy for evaluating the geometric stiffness in plated structures, which is considered with realistic assumed modes for plate buckling leading to accurate predictions of local buckling. In developing this approach for sandwich panels with metal cores, such as rectangular honeycomb cores, due account is taken of the stiffness of adjacent co-planar and orthogonal plates and its influence on local buckling. In this respect, design-oriented models are proposed for core shear buckling, intercellular buckling of the faceplates and buckling of slotted cores under compressive patch loading. Finally, the proposed design-oriented models are verified against detailed non-linear finite-element analysis, highlighting the accuracy of buckling predictions.
机译：用于夹芯板的现代设计方法必须尝试最大程度地减少此类系统的重量，从而实现高度优化的结构组件。成功的大型夹芯板设计方法需要考虑每种可能的失效模式。准确预测各种故障模式不仅是必要的，而且还应采用适合实际应用的简单方法。为了满足这些要求，本文提出了一种基于力学的方法来评估具有金属芯的夹芯板的局部屈曲现象。这种方法采用旋转弹簧类比来评估镀层结构的几何刚度，考虑采用实际假定的板屈曲模式，从而可以精确预测局部屈曲。在开发用于具有金属芯（例如矩形蜂窝芯）的夹芯板的方法时，要充分考虑相邻共面和正交板的刚度及其对局部屈曲的影响。在这方面，针对压缩剪切加载下的岩心剪切屈曲，面板的胞间屈曲和开槽岩心屈曲提出了面向设计的模型。最后，针对详细的非线性有限元分析验证了所提出的面向设计的模型，突出了屈曲预测的准确性。

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