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首页> 外文期刊>Journal of Engineering Mechanics >Fiber Element Model of Sandwich Panels with Soft Cores and Composite Skins in Bending Considering Large Shear Deformations and Localized Skin Wrinkling
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Fiber Element Model of Sandwich Panels with Soft Cores and Composite Skins in Bending Considering Large Shear Deformations and Localized Skin Wrinkling

机译：考虑大剪切变形和局部起皱的软芯夹芯复合材料夹芯板弯曲的纤维单元模型

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摘要

This paper studies the flexural performance of sandwich panels composed of a soft polyurethane foam core and glass-fiber-reinforced polymer (GFRP) skins. A robust numerical model is developed to predict the full load-deflection and strain responses of the panel. It is based on equilibrium and strain compatibility and accounts for the excessive shear deformation and material nonlinearity of the core. It also accounts for geometric nonlinearity in the form of localized deflection of the loaded skin using the principals of beam-on-elastic foundation and the change in core thickness due to its softness. The model incorporates various failure criteria, namely core shear failure, core flexural tension or compression failure, compression skin crushing or wrinkling, or tensile rupture of skin. The model has the advantage of being able to isolate quantitatively the individual contributions of flexure, shear, and localized skin deformations, to overall deflection. A parametric study is performed to examine the effects of core density and skin thickness on panel behavior. It is shown that as the core density increases from 32 to 192kg/m3, the contribution of shear to overall deflection reduces from about 90 to 10%. It also appears that the optimal core density of the sandwich panels is within 96 to 128kg/m3, which represents the lowest density necessary to achieve the highest ultimate strength and stiffness.
机译：本文研究了由软聚氨酯泡沫芯和玻璃纤维增​​强聚合物（GFRP）蒙皮组成的夹芯板的抗弯性能。开发了一个健壮的数值模型来预测面板的满负荷挠度和应变响应。它基于平衡和应变兼容性，并考虑了岩心过度的剪切变形和材料非线性。它还使用弹性梁基础原理以及由于其柔软性而导致的岩心厚度变化，以加载的蒙皮的局部挠度形式解决了几何非线性问题。该模型包含了各种破坏准则，即岩心剪切破坏，岩心弯曲拉伸或压缩破坏，表皮受压碎裂或起皱或表皮拉伸断裂。该模型的优点是能够定量地分离出挠曲，剪切和局部皮肤变形对整体变形的贡献。进行了参数研究，以检查核心密度和皮肤厚度对面板行为的影响。结果表明，随着岩心密度从32kg / m3增加到192kg / m3，剪切对总挠度的贡献从大约90％降低到10％。还似乎是，夹心板的最佳芯密度在96至128kg / m3之内，这代表了实现最高极限强度和刚度所需的最低密度。

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