Effect of Yarn Sizes on the Tensile Damage Evolution of a C/SiC Composite Fabricated by Chemical Vapor Infiltration

Abstract

The damage evolutions of C/SiC composites fabricated by chemical vapor infiltration with two different sizes of yarns were compared by cyclic tensile load/unload tests accompanied with the acoustic emission (AE) monitoring. The results show that an inflexion was observed in both the evolution of hysteresis characteristics and the corresponding AE curve for composite with fine yarns, which is, however, absent for composite with coarse yarns, suggesting that the former is much closer to the tough material than the latter one. Felicity effect was observed for both composites, which is more pronounced for the composite with coarse yarns due to the large yarn sizes leading to more matrix debris inside the yarns.

Fabrication and characterization of silicon carbide/epoxy nanocomposite using silicon carbide nanowhisker and nanoparticle reinforcements

“…Bulk SiC is a ceramic material with high hardness, wear resistance, high temperature stability and chemical inertness that has many applications in abrasive, metallurgy, composite and electronic industries. 3,10,11 In addition to SiC nanoparticles that have a and b isomorphs, SiC nanowhiskers are one of the new synthesized materials made by crystals grown in Miller index [1 1 1] direction. There are new methods for nanowhisker synthesis such as growing inside nanotubes, chemical vapor deposition, catalytic pyrolisis etc.…”