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Thermo-oxidative aging induced multi-scale shrinkage and damage in 3D angle-interlock woven composites
Composites Science and Technology ( IF 8.3 ) Pub Date : 2024-01-09 , DOI: 10.1016/j.compscitech.2024.110438
Yanan Ke , Shuwei Huang , Baozhong Sun , Frank Ko , Bohong Gu

The deterioration of resin and interface in composites deteriorate during high-temperature service, would impact both the thermal stability and overall performance significantly. This paper focused on the experimental characterization of multi-scale damage and resin shrinkage within composites induced by thermo-oxidative aging using Micro-CT, SEM and Confocal Interferometric Microscopy (CIM), and exploring the coupling mechanism between them. The results show that damage distribution and propagation are affected by the hierarchical structure of 3-D angle-interlock fabric. Macro-CIM shows that maximum resin shrinkage depth depends on the resin width and aging time. Resin shrinkage profile evolution demonstrated the accelerating effect of resin crack on shrinkage. Micro-CIM shows that macro yarn cracks form through the accumulation of micro resin cracks in resin-rich areas and fiber/resin interface debonding. The formation of fiber/resin interface crack is tied to the resin shrinkage state, only occurring when the surrounding resin shrinkage slope exceeds a specific threshold value.



中文翻译:

热氧化老化引起的 3D 角度互锁编织复合材料的多尺度收缩和损伤

在高温使用过程中,复合材料中树脂和界面的劣化会严重影响热稳定性和整体性能。本文重点利用Micro-CT、SEM和共焦干涉显微镜(CIM)对热氧化老化引起的复合材料内多尺度损伤和树脂收缩进行实验表征,并探讨它们之间的耦合机制。结果表明,损伤分布和传播受到 3D 角度互锁织物分层结构的影响。宏观 CIM 显示最大树脂收缩深度取决于树脂宽度和老化时间。树脂收缩曲线的演变证明了树脂裂纹对收缩的加速作用。Micro-CIM表明,宏观纱线裂纹是通过树脂丰富区域中微观树脂裂纹的积累和纤维/树脂界面脱粘而形成的。纤维/树脂界面裂纹的形成与树脂收缩状态有关,仅当周围树脂收缩斜率超过特定阈值时才会发生。

更新日期:2024-01-13
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