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Wong, Sherman
in Cooperation with on an Cooperation-Score of 37%
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article
Direct Measurement of the Transverse Modulus of Carbon Fibres
Abstract
The transverse compressive properties are integral to fully utilising the high performing mechanical properties of carbon fibres (CF). A system that directly measures transverse compressive modulus (ET) by utilising interference speckle patterns to measure sub-pixel resolutions is presented. The compression data from an isotropic glass fibre was fitted using an elastic contact mechanics model. An initial section was observed, which was not readily fitted using the model. Once the initial section was systematically removed an ET of 82 GPa was derived, comparable to the reported longitudinal tensile modulus (EL) of 86 GPa. The response of Ag wire to cyclic compression was also measured, with the behaviour consistent with a material undergoing typical cyclic stress-strain. Several CFs were compressed and an inversely proportional relationship between ET and EL was observed. Hysteresis was observed for some of the polyacrylonitrile (PAN)-based CFs and a method for ensuring an accurate fitting of hysteretic load/unload curves was proposed.Transverse compressive moduli of 8.2 (0.8), 6.5 (0.7), 4.3 (0.3), and 2.1 (0.4) were obtained for Toray T300, Pyrofil HS40, Pyrofil TR50S, and Dialead K13312, respectively (numbers in parenthesis are standard deviations).