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 |
卷 | 45 |
期 | 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