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On the relationship between failure mechanism and compression after impact (CAI) strength in composites

机译：复合材料破坏机理与冲击后压缩强度的关系

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摘要

This work explores the relationship between different failure mechanisms and compression after impact (CAI) strength through an advanced finite element analysis. A Continuum Damage Mechanics (CDM) approach is used to model intra-laminar failure and Cohesive Zone Modelling (CZM) for inter-laminar failure. The FE progressive failure analysis is performed in two consecutive steps. The first is a low-velocity impact analysis in which the induced damage maps are obtained. In the second step, the boundary conditions are modified and an analysis of CAI is performed. The effect of change in ply layup sequence, sub-laminate scaling and ply blocking are investigated and a link between failure and CAI strength is established. Results suggest that changes in ply layup sequence affect delamination sizes, positions and shapes during impact, which in turn result in either global or sub-laminate buckling failure during compression. A global buckling mode results in higher CAI strength compared to failure by sub-laminate buckling for quasi-isotropic laminates of the same thickness. Ply-blocking increases tendency towards delamination, causing a decrease in CAI strength. Sub-laminate scaling causes a transition in failure mode from out-of-plane buckling to in-plane compressive fiber failure. These results suggest a strong correlation between failure mechanism and CAI strength.
机译：这项工作通过高级有限元分析探索了不同的破坏机制与冲击后压缩（CAI）强度之间的关系。连续损伤力学（CDM）方法用于对层内失效进行建模，而内聚区建模（CZM）用于层间失效。 FE渐进式故障分析在两个连续的步骤中执行。第一个是低速冲击分析，其中获得了诱导损伤图。在第二步中，修改边界条件并执行CAI分析。研究了铺层顺序改变，层间结垢和铺层阻塞的影响，并建立了破坏与CAI强度之间的联系。结果表明，铺层顺序的变化会影响碰撞过程中的脱层尺寸，位置和形状，进而导致压缩过程中整体或亚层板屈曲破坏。与相同厚度的准各向同性层压板的亚层板屈曲引起的破坏相比，整体屈曲模式导致更高的CAI强度。层板阻塞增加了分层的趋势，导致CAI强度降低。子层压板的缩放会导致故障模式从平面外屈曲过渡到平面内压缩光纤故障。这些结果表明，失效机理与CAI强度之间存在很强的相关性。

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  • 来源
    《Composite Structures》 |2017年第12期|242-250|共9页
  • 作者

    Abir M. R.; Tay T. E.; Ridha M.; Lee H. P.;

  • 作者单位

    Natl Univ Singapore, Dept Mech Engn, 9 Engn Dr 1, Singapore 117575, Singapore;

    Natl Univ Singapore, Dept Mech Engn, 9 Engn Dr 1, Singapore 117575, Singapore|Block EA 02-21,9 Engn Dr 1, Singapore 117575, Singapore;

    Natl Univ Singapore, Dept Mech Engn, 9 Engn Dr 1, Singapore 117575, Singapore|Block EA 02-21,9 Engn Dr 1, Singapore 117575, Singapore;

    Natl Univ Singapore, Dept Mech Engn, 9 Engn Dr 1, Singapore 117575, Singapore|Block EA 02-21,9 Engn Dr 1, Singapore 117575, Singapore;

  • 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

    CAI; Impact; Progressive damage; Failure mechanism; Residual strength;

    机译：CAI;冲击;渐进式破坏;失效机理;残余强度;

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