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首页> 外文学位 >Low Velocity Impacts of Variable Tip Radius on Carbon/Epoxy Plates.
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Low Velocity Impacts of Variable Tip Radius on Carbon/Epoxy Plates.

机译：可变尖端半径对碳/环氧板的低速影响。

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摘要

With a growing use of composite materials in aircraft structures, there is a greater need to understand the response of these materials to low velocity impacts. Low velocity impacts from tool drops or ground equipment collisions can be of varying bluntness and can leave little or no visible evidence of damage. Therefore, a need exists to investigate the initiation of internal damage and the relationship between this internal damage and the external visible damage with respect to the bluntness of the impactor.;A pendulum impactor was used to impact 76.2 x 127 mm carbon/epoxy panels that were 8, 16, and 24 plies thick. The panels were impacted by hardened steel tips with radii of 12.7 to 76.2 mm.;The experimental results show that the failure threshold energies for each panel thickness and tip radius combination occur at a distinct and consistent energy. This threshold increases with impactor bluntness, and this effect is greater for the 8 ply panel than it is for the 16 or 24 ply panels. To describe the visibility of impact damage, the area of delamination was compared to the depth of the dents resulting from the impacts. For the sharper impact tips, there is a clear relationship between the delamination area and the depth of the dents. However, these relationships are dependent on the radius of the impact tip, and for the blunter impact tips no strong correlation could be determined between the delamination area and the depth of the dents.
机译：随着复合材料在飞机结构中的使用越来越多，越来越需要了解这些材料对低速撞击的响应。因工具掉落或地面设备碰撞而产生的低速冲击可能会产生不同程度的钝化，并且几乎没有或没有明显的损坏迹象。因此，有必要研究内部损坏的发生以及与撞击器钝性有关的内部损害与外部可见损害之间的关系。;摆锤撞击器撞击了76.2 x 127毫米的碳/环氧树脂板分别是8、16和24层厚。面板受到半径为12.7至76.2 mm的硬化钢尖端的冲击。实验结果表明，每种面板厚度和尖端半径组合的破坏阈值能量均以明显且一致的能量发生。该阈值随冲击器钝性而增加，并且对于8层板而言，此效果比16或24层板更大。为了描述冲击破坏的可见性，将分层区域与冲击产生的凹痕深度进行了比较。对于更尖锐的撞击尖端，分层区域和凹痕深度之间存在明显的关系。然而，这些关系取决于冲击尖端的半径，并且对于钝头冲击尖端，不能确定分层区域和凹痕深度之间的强相关性。

著录项

  • 作者

    Delaney, Mac P.;

  • 作者单位

    University of California, San Diego.;

  • 授予单位 University of California, San Diego.;
  • 学科 Engineering Aerospace.;Engineering Materials Science.
  • 学位 M.S.
  • 年度 2013
  • 页码 179 p.
  • 总页数 179
  • 原文格式 PDF
  • 正文语种 eng
  • 中图分类
  • 关键词

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