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论文类型：期刊论文
发表时间：2013-06-01
发表刊物：APPLIED SPECTROSCOPY
收录刊物：PubMed、SCIE、EI、Scopus
卷号：67
期号：6
页面范围：600-605
ISSN号：0003-7028
关键字：Interfacial stress transfer; Fiber pullout test; Micro-Raman spectroscopy
摘要：The interfacial stress transfer behavior of a Kevlar 49 aramid fiber-epoxy matrix was studied with fiber pullout tests, the fibers of which were stretched by a homemade microloading device. Raman spectra on the embedded fiber were recorded by micro-Raman spectroscopy, under different strain levels. Then, the fiber axial stress was obtained by the relationship between the stress and Raman shift of the aramid fiber. Experimental results revealed that the fiber axial stress increased significantly with the load. The shear stress concentration occurred at the fiber entry to the epoxy resin. Thus, interfacial friction stages exist in the debonded fiber segment, and the interfacial friction shear stress is constant within one stage. The experimental results are consistent with the theoretical model predictions.