Study of Reticulated Vitreous Carbon Foam as a Quasi-Brittle Material

P.J. Heard; Peter E.J. Flewitt

doi:10.4028/www.scientific.net/KEM.665.229

Paper Titles

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An Effect of Laser Hardening on Contact and Bending Fatigue of a 42CrMo4 Steel
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Failure Susceptibility in Thin Films with Extensive Incompatibility in Thermo-Elastic Material Properties
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Study of Reticulated Vitreous Carbon Foam as a Quasi-Brittle Material
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Effect of Voids on a Magistral Crack in Piezoelectric Brittle Materials
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Damage Model for Degradation Induced by Volcanic Ash Deposition on Thermal Barrier Coatings
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Statistical Analysis of SHM Passive Sensing Systems
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On the Role of Double Die Angle on the Hydrogen Embrittlement of Cold Drawn Prestressing Steel Wires
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Study of Reticulated Vitreous Carbon Foam as a Quasi-Brittle Material

Abstract:

Quasi-brittle materials are those where the addition of specific microstructural features such as porosity can lead to departure from linear elastic behaviour prior to maximum force, followed by graceful failure. A simple example of a quasi-brittle material is reticulated vitreous carbon foam; an open-cell structure consisting of brittle ligaments connected in a three-dimensional array. Tensile testing measurements have been made on foams with various pore and ligament dimensions; force - displacement combined with acoustic monitoring together with the evaluation of the associated elastic moduli and fracture strengths. These tests give insights into the mechanisms of quasi-brittle failure, and the results are explored using simple considerations of elastic energy storage throughout process zones.

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