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Failure analysis and modeling of foam sandwich laminates under impact loading

机译：冲击载荷下泡沫夹芯板的失效分析与建模

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摘要

This study made an effort to analyze the failure features of sandwich plates composed by composite faceplates and foam cores under impact. Drop weight tests were carried out involving different impact energy, foam density and stacking sequences. Ultrasonic microscope and cross section observation was conducted to reveal the failure details within the structure. The delamination among the top faceplate was found to follow the debonding law of composite laminates. The penetration of the top plate will change the shape of delamination region and stop the expansion of the delamination area as the impact energy increases. Sandwich structure with a hard core was proved to be more vulnerable to delamination than the one with a soft core, but this difference became negligible when penetration took place. Crush region and fracture region were located in the structure respectively, which was helpful for strength estimation and repair works. A new numerical model based on user-defined material subroutine was proposed for sandwich structures under impact. The model has the advantage of reproducing the failure features correctly and was proved to be effective.
机译：这项研究致力于分析由复合面板和泡沫芯在冲击作用下组成的夹心板的破坏特征。进行了落锤重量测试，涉及不同的冲击能，泡沫密度和堆积顺序。进行超声波显微镜和横截面观察以揭示结构内的破坏细节。发现顶部面板之间的分层遵循复合层压板的剥离定律。随着冲击能量的增加，顶板的穿透将改变分层区域的形状并阻止分层区域的扩展。事实证明，具有硬核的三明治结构比具有软核的三明治结构更容易分层，但是当发生渗透时，这种差异可以忽略不计。挤压区和断裂区分别位于结构中，有助于强度估算和修复工作。提出了一种基于用户自定义材料子程序的数值模型，用于冲击作用下的夹层结构。该模型具有正确再现故障特征的优点，并被证明是有效的。

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  • 来源
    《Composite Structures》 |2018年第8期|10-20|共11页
  • 作者

    Long Shuchang; Yao Xiaohu; Wang Heran; Zhang Xiaoqing;

  • 作者单位

    South China Univ Technol, Sch Civil Engn & Transportat, Guangzhou 510640, Guangdong, Peoples R China;

    South China Univ Technol, Sch Civil Engn & Transportat, Guangzhou 510640, Guangdong, Peoples R China;

    South China Univ Technol, Sch Civil Engn & Transportat, Guangzhou 510640, Guangdong, Peoples R China;

    South China Univ Technol, Sch Civil Engn & Transportat, Guangzhou 510640, Guangdong, Peoples R 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

    Sandwich plates; CFRP; Polyurethane foam; Impact; Failure; Numerical simulation;

    机译：夹层板;CFRP;聚氨酯泡沫;冲击;失效;数值模拟;

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