Raman measurements of Kevlar-29 fiber pull-out test at different strain levels

Quan Wang; Zhenkun Lei; Yilan Kang; Wei Qiu

doi:10.1117/12.839012

24 August 2009 Raman measurements of Kevlar-29 fiber pull-out test at different strain levels

Quan Wang, Zhenkun Lei, Yilan Kang, Wei Qiu

Proceedings Volume 7375, ICEM 2008: International Conference on Experimental Mechanics 2008; 737509 (2009) https://doi.org/10.1117/12.839012
Event: International Conference on Experimental Mechanics 2008 and Seventh Asian Conference on Experimental Mechanics, 2008, Nanjing, China

Abstract

This paper adopted Kevlar-29 fiber monofilament embedding technology to prepare fiber/ epoxy resin tensile specimen. The specimen was pulled on a homemade and portable mini-loading device. At the same time micro-Raman spectroscopy is introduced to detect the distributions of stress on the embedded fiber at different strain levels. The characteristic peak shift of the 1610 cm^-1 in Raman band has a linear relationship with the strain or stress. The experimental results show that the fiber axial stress decreases gradually from the embedded fiber-start to the embedded fiber-end at the same strain level. At different strain levels, the fiber axial stress increases along with the applied load. It reveals that there is a larger fiber axial stress distribution under a larger strain level. And the stress transfer is realized gradually from the embedded fiber-start to the fiber-end. Stress concentration exists in the embedded fiber-end, which is a dangerous region for interfacial debonding easily.

Citation Download Citation

Quan Wang, Zhenkun Lei, Yilan Kang, and Wei Qiu "Raman measurements of Kevlar-29 fiber pull-out test at different strain levels", Proc. SPIE 7375, ICEM 2008: International Conference on Experimental Mechanics 2008, 737509 (24 August 2009); https://doi.org/10.1117/12.839012

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