Title

An In Situ Raman Stress Measurement Method For Tensile Testing Of Carbon Nanofiber/ Nanotube Composites

Abstract

This research focuses on a novel approach to determine stresses within a carbon nanotube/ nanofiber (CNT/CNF) composite through Raman spectroscopy. Carbon polymorphs are a wellknown Raman-active group of materials and hence Raman scattering is an effective technique for their characterization. A conventional visible Raman spectrum of disordered carbon film is dominated by a D peak centered around 1360 cm-1 and a G peak around 1580 cm-1. Their peak shifts have been associated with mechanical and thermal stress and also due to variation in the physical parameters and hydrostatic pressure. Our process involves using an optical fiber-based probe to focus and provide laser excitation to the sample under load. Vibrational energy is collected in the form of an emission spectrum and relationships between the mechanical properties and the Raman spectra of Carbon Nanofiber (CNF) are used to establish the stresses within the sample as the load changes. Stress distribution in the sample at discrete force increments is found and the effects on the G band of CNF are observed using this unique setup of a fiber optic probe coupled with an XYZ stage. A deconvolution and fitting process was used to analyze the collected spectral data from CNT/CNF tensile experiments to monitor the independent shifts of peak positions from the G and D bands. Development of this method for non-destructive tensile testing of these materials, will contribute to the improved design of CNT/CNF composites.

Publication Date

8-30-2011

Publication Title

International SAMPE Technical Conference

Number of Pages

-

Document Type

Article; Proceedings Paper

Personal Identifier

scopus

Socpus ID

80052071828 (Scopus)

Source API URL

https://api.elsevier.com/content/abstract/scopus_id/80052071828

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