In situ observations of fractures in short carbon fiber/epoxy composites
In situ observations of fractures in short carbon fiber/epoxy composites
复制标题
短碳纤维/环氧树脂复合材料断裂的原位观察
DOI：
10.1016/j.carbon.2013.10.007
复制
发表时间：
2014-02-01
期刊：
影响因子：
10.9
通讯作者：
Zhang, Zhong
中科院分区：
文献类型：
--
作者：
Hu, Xiaofang;Wang, Luobin;Zhang, Zhong
与传统的观察方法相比，同步辐射X射线计算机层析成像(SR-CT)是一种先进的技术，可以直接三维(3D)和无损地观察材料的微观结构。利用SR-CT技术对短碳纤维/环氧复合材料的断口进行了高分辨率(0.7µm/像素)的原位观测，并比较了氧化处理和未处理的短碳纤维的力学载荷响应。通过对高分辨率三维图像中显微组织参数的定量提取和分析，研究了两种材料的破坏机理。经氧化处理的纤维样品中，断裂纤维占其他类型纤维损伤的比例增加了约6%。此外，氧化处理能够将纤维的无效长度减少约20%，从而改善这些复合材料的力学性能。研究结果表明，计算机层析成像技术能更好地表征碳纤维增强聚合物复合材料的内部微观结构，为进一步从理论上研究碳纤维增强聚合物复合材料的失效机理奠定了基础。(C)2013爱思唯尔有限公司。保留所有权利。
In contrast with traditional methods of observation, synchrotron radiation X-ray computed tomography (SR-CT) is an advanced technique that allows direct three-dimensional (3D) and non-destructive observation of microstructures in materials. High-resolution in situ observations (0.7 mu m/pixel) of fractures in short carbon fiber/epoxy composites are achieved using the SR-CT technique, and the mechanical load response of short carbon fibers treated with oxidation and those untreated are compared. By the quantitative extraction and analysis of microstructure parameters in high-resolution 3D images, the failure mechanisms of the two materials were studied. The proportion of broken fibers to other types of fiber damage in the sample with oxidation-treated fibers increases by about 6%. Also, the oxidation treatment is able to reduce the ineffective length of the fibers by about 20%, thereby improving the mechanical properties of these composites. The results show that computed tomography can promote characterization of the internal microstructures in carbon fiber-reinforced polymer composites, which will facilitate further theoretical research on the failure mechanisms of these composites. (C) 2013 Elsevier Ltd. All rights reserved.