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首页> 外文期刊>Journal of thermal stresses >Thermomechanical wrinkling and strength of sandwich panels with nanoscale or microscale randomly reinforced core
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Thermomechanical wrinkling and strength of sandwich panels with nanoscale or microscale randomly reinforced core

机译：纳米级或微米级随机增强芯夹芯板的热机械起皱和强度

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摘要

Wrinkling represents one of the failure modes in sandwich structures, although in practical designs the loss of strength and global buckling often occur at lower compressive loads. However, the properties of both polymeric matrix in the facings as well as the polymeric core degrade under an elevated temperature. As a consequence, wrinkling that does not present a problem at the room temperature may become a dominant mode of failure at elevated temperatures. In this article, we suggest that a reinforcement of the core material with stiff random nanoscale or microscale reinforcements may alleviate wrinkling. The solution accounts for the thermal loading history and the effect of temperature on the stiffness of the materials of the core and facings. While nano or microscale reinforcements increase the capacity of the structure to resist wrinkling, the strength of the core may be compromised due to the presence of such inclusions in the core material. Accordingly, the residual stresses in the reinforced core are evaluated using a finite-element method and accounting for the effect of temperature on the properties and stresses. It is demonstrated that both wrinkling and the core strength analyses should account for the effect of temperature on the material properties.
机译：皱纹是夹层结构的一种破坏模式，尽管在实际设计中，强度损失和整体屈曲通常发生在较低的压缩载荷下。但是，在升高的温度下，饰面中的聚合物基体以及聚合物芯的性能均下降。结果，在室温下没有问题的起皱可能成为高温下失效的主要方式。在本文中，我们建议采用硬质随机纳米级或微米级增强材料增强核心材料可以减轻起皱。该解决方案考虑了热负荷历史以及温度对型芯和饰面材料刚度的影响。尽管纳米级或微米级增强物增加了结构抗皱的能力，但是由于在芯材中存在此类夹杂物，因此可能会损害芯材的强度。因此，使用有限元方法评估了增强型芯中的残余应力，并考虑了温度对特性和应力的影响。结果表明，起皱和芯强度分析都应考虑温度对材料性能的影响。

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  • 来源
    《Journal of thermal stresses》 |2019年第3期|73-89|共17页
  • 作者

    Birman Victor; Lee Jeffrey N.;

  • 作者单位

    Missouri Univ Sci & Technol, Global St Louis, 12837 Flushing Meadows Dr,Suite 210, St Louis, MO 63131 USA|Missouri Univ Sci & Technol, Dept Mech & Aerosp Engn, 12837 Flushing Meadows Dr,Suite 210, St Louis, MO 63131 USA;

    Missouri Univ Sci & Technol, Dept Mech & Aerosp Engn, Rolla, MO USA;

  • 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

    Sandwich structure; shear-lag problem; thermal stresses; wrinkling;

    机译：夹心结构;剪切滞后问题;热应力;起皱;

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