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Bending behavior of lightweight sandwich-walled shells with pyramidal truss cores

机译:带有锥体桁架芯的轻质夹心壁壳的弯曲行为

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摘要

A study on the bending response of a composite curved panel with pyramidal metallic truss cores suitable for functional applications is presented using a combination of analytical modeling, three-point bending experiments and finite element (FE) based simulations. The aluminum pyramidal cores were constructed using an interlocking method before curing with composite face sheets to fabricate the final structure. A theoretical model was developed to analyze the experiments and develop failure criteria. Three failure modes: (ⅰ) face wrinkling, (ⅱ) face crushing, and (ⅲ) debonding between face sheet and truss cores, were considered and theoretical relationships for predicting the collapse load associated with each mode were developed. The experiments were carried out on two sets of specimens with differing face sheet thickness which clearly indicated the important role played by core debonding in determining the peak load of the structure. Localized buckling instabilities were also reported for samples with thinner face sheets. The role of debonding in determining strength was further highlighted by a comparison with FE simulations with suppressed debonding.
机译:结合分析模型,三点弯曲实验和基于有限元(FE)的模拟,对具有功能性应用的具有锥体金属桁架芯的复合弯曲面板的弯曲响应进行了研究。在使用复合面板固化以制造最终结构之前,使用互锁方法构造铝金字塔形芯。建立了理论模型来分析实验并制定失效标准。考虑了三种破坏模式:(ⅰ)面皱纹,(ⅱ)面压碎和(ⅲ)面板与桁架芯之间的脱粘,并建立了与每种模式相关的预测倒塌载荷的理论关系。实验是在两组具有不同面板厚度的试样上进行的,这些试样清楚地表明了芯剥离在确定结构的峰值载荷中所起的重要作用。还报道了具有较薄面板的样品的局部屈曲不稳定性。通过与具有有限脱粘作用的有限元模拟进行比较,进一步突出了脱粘作用在确定强度方面的作用。

著录项

  • 来源
    《Composite Structures》 |2014年第sepaaocta期|793-804|共12页
  • 作者单位

    Center for Composite Materials and Structures, Harbin Institute of Technology, Harbin 150001, PR China;

    Department of Mechanical and Industrial Engineering, Northeastern University, Boston, MA 02115, USA;

    Center for Composite Materials and Structures, Harbin Institute of Technology, Harbin 150001, PR China;

    Department of Mechanical and Industrial Engineering, Northeastern University, Boston, MA 02115, USA;

    Department of Mechanical and Industrial Engineering, Qatar University, Doha, Qatar;

    Department of Mechanical and Industrial Engineering, Northeastern University, Boston, MA 02115, USA;

    Center for Composite Materials and Structures, Harbin Institute of Technology, Harbin 150001, PR 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

    A. Carbon fiber; B. Bending; C. Curved sandwich panel; D. Composite failure;

    机译:A.碳纤维;B.弯曲;C.弯曲的夹心板;D.复合故障;

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