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Modeling of axial and shear stresses in multilayer sandwich beams with stiff core layers

机译：具有刚性芯层的多层夹层梁的轴向和剪应力建模

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摘要

In order to optimize the load-bearing behavior of sandwich structures and adapt it to specific requirements, their core may be composed of layers of different materials with tailored properties. These layers may consist not only of soft foam or honeycomb materials but also comprise stiff materials, e.g. timber, or even very stiff laminates in the case of fiber-reinforced polymer (FRP) materials. In this paper, new analytical models for predicting axial and shear stresses in multilayer sandwich structures composed of stiff core layers and intermediate laminates are presented. The models are based on new formulations for calculating the bending and shear stiffness of multilayer sandwiches. They have been validated by finite element modeling (FEM) and the results from four-point bending experiments on GFRP-balsa sandwich beams with complex core assembly. In contrast to existing models, e.g. the high-order sandwich panel theory (HSAPT), the new models are able to accurately predict axial and shear stresses in stiff cores and intermediate FRP laminate layers.
机译：为了优化夹层结构的承载性能并使之适应特定要求，其核心可能由具有定制属性的不同材料层组成。这些层不仅可以由软泡沫或蜂窝材料组成，还可以包括硬质材料，例如硬质材料。木材，或者就纤维增强聚合物（FRP）材料而言，甚至是非常坚硬的层压板。在本文中，提出了用于预测由刚性芯层和中间层压板组成的多层夹心结构中轴向应力和剪切应力的新分析模型。该模型基于用于计算多层三明治的弯曲和剪切刚度的新公式。它们已经通过有限元建模（FEM）进行了验证，并且通过对具有复杂型芯组件的GFRP-轻木夹芯梁进行四点弯曲实验的结果进行了验证。与现有模型相反，例如在高阶夹心板理论（HSAPT）中，新模型能够准确预测硬芯和FRP中间层压板层中的轴向应力和剪切应力。

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  • 来源
    《Composite Structures》 |2014年第sepaaocta期|453-460|共8页
  • 作者

    Michael Osei-Antwi; Julia de Castro; Anastasios P. Vassilopoulos; Thomas Keller;

  • 作者单位

    Composite Construction Laboratory (CCLab), Ecole Polytechnique Federale de Lausanne (EPFL), Station 16, Batiment BP, CH-1015 Lausanne, Switzerland;

    Composite Construction Laboratory (CCLab), Ecole Polytechnique Federale de Lausanne (EPFL), Station 16, Batiment BP, CH-1015 Lausanne, Switzerland;

    Composite Construction Laboratory (CCLab), Ecole Polytechnique Federale de Lausanne (EPFL), Station 16, Batiment BP, CH-1015 Lausanne, Switzerland;

    Composite Construction Laboratory (CCLab), Ecole Polytechnique Federale de Lausanne (EPFL), Station 16, Batiment BP, CH-1015 Lausanne, Switzerland;

  • 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

    Analytical sandwich models; Multilayer sandwich beam; Stiff/rigid cores; Balsa core; Timber core;

    机译：分析三明治模型;多层夹芯梁;刚性/刚性芯;轻木芯;木芯;

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