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首页> 外文会议>International Conference on High Performance Structures and Materials; 2006; Ostends(BE) >Measurement of the fiber stress distribution during pull-out test by means of micro-Raman spectroscopy and FEM analysis
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Measurement of the fiber stress distribution during pull-out test by means of micro-Raman spectroscopy and FEM analysis

机译：借助显微拉曼光谱和有限元分析测量拉拔测试过程中的纤维应力分布

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摘要

A single-fiber pull-out model composite for an aramid/epoxy system was specially designed to measure the stress distribution of the aramid fiber embedded in the matrix using micro-Raman spectroscopy. The stress transfer length of the fiber obtained was about 400-500μm, which was equal to the result of FEM analysis. Just after the initiation and propagation of the fiber/matrix interfacial debonding, the fiber was broken, and the fiber in the matrix had the axial tensile residual stress. The tensile residual fiber axial stress showed the maximum at around the tip of the interfacial debonding. The stress was reduced and became almost equal to zero after being immersed in deionized water at 80℃ for 44h. This behavior agreed with the result of FEM analysis, in which the friction coefficient was introduced in the fiber/matrix interface.
机译：特别设计了用于芳族聚酰胺/环氧树脂系统的单纤维拉出模型复合材料，以使用微拉曼光谱法测量嵌入基质中的芳族聚酰胺纤维的应力分布。所得纤维的应力转移长度约为400-500μm，与FEM分析的结果相同。在纤维/基体界面剥离的开始和传播之后，纤维就断裂了，并且基体中的纤维具有轴向拉伸残余应力。残余纤维的轴向拉伸应力在界面剥离的尖端附近显示出最大值。将其浸入80℃的去离子水中44h后，应力减小并几乎等于零。这种行为与有限元分析的结果一致，在纤维/基体界面中引入了摩擦系数。

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