考虑固化残余应力影响的 Z-pin 增韧复材压缩性能预测方法

Shengnan Zhang, Yingjie Xu, Weihong Zhang

科研成果: 期刊稿件文章同行评审

摘要

The Z-pinning technology can effectively improve the interlaminar properties of composite materials,yet the implantation of Z-pins causes fiber distortion,resin-rich zones,and reduced in-plane properties. This paper proposes a numerical method to predict the in-plane compressive properties of Z-pinned composites,with curing effects into consideration. A representative unit cell model is established by analyzing the fine morphology of the Z-pinned structure. Considering the time-dependent properties of the cure process,we develop a coupled thermo-chemo-mechanical multi-field model for Z-pinned structures. The residual stress field obtained from the previous calculation is introduced as a predefined field in the calculation of in-plane compressive performance,and the simulated results are in good agree⁃ ment with the experimental results. It is found that a large amount of residual stress accumulates around the Z-pin during the cure. Therefore,under compressive loads,weaker material properties around the Z-pin will first develop crack defects,gradually extending to the resin-rich regions. The presence of fiber orientation,resin-rich regions,and cure-induced residual stresses significantly reduce the in-plane compressive performance of Z-pinned composites.

投稿的翻译标题Numerical study on curing residual stresses in compression of Z-pinned composites
源语言繁体中文
文章编号429966
期刊Hangkong Xuebao/Acta Aeronautica et Astronautica Sinica
45
20
DOI
出版状态已出版 - 25 10月 2024

关键词

  • composites
  • compressive properties
  • cure process
  • fiber distortion
  • finite element analysis
  • residual stress
  • Z-pin

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