Effect of Through-the-Thickness Yarn Fineness and Distanceon Damage Behavior of Carbon-Phenolic 3D Composites

Document Type : Research Paper

Authors

1 Textile Excellence and Research Centers, Textile Engineering Department, Amirkabir University of Technology, P.O. Box: 14965-115, Tehran, Iran

2 Department of Composite, Faculty of Processing, Iran Polymer and Petrochemical Institute, P.O. Box: 14975-112, Tehran, Iran

Abstract

The effects of through-the-thickness yarn fineness and distance on the damage behavior of vacuum resin infused 3D carbon-phenolic composites were investigated. For this purpose, the carbon/phenolic composites with different tufting thread fineness (count) and distance ranging from 5.5 mm to 16.5 mm were produced to determine an optimum distance and count in the composites. Three-point bending test results show that the flexural strength of tufting composites may drop 17% to 34 % while through thickness reinforcements set up a mechanical connection between the plies and bridge over delamination cracks to avoid their penetration. The weakness is attributed to damaging effect of tufting method, misallignments of X-Y fibers in presence of Z direction reinforcement and stress concentration effect of produced holes for tufting. On the other hands, Z direction reinforcements prevent fibers delamination. Therefore, the laminate strength was increased and failure mechanism was changed from brittle to ductile fracture. In addition at the same through-thickness yarn count of tufting composites, with the increase in tufting distance, the flexural strength is reduced. But i in the case of samples with tufting distance of 5.5 mm, the flexural strength reduced with increase in thorough-the-thickness yarn count, but for samples with tufting distance of 16 mm, showed some increases with the same count variations. After the failure stress in stress-displacement curve was increased for specimens with Z direction reinforcements.

Keywords

Iranian Journal of Polymer Science and Technology
Volume 27, Issue 5 - Serial Number 5
November and December 2014
Pages 448-441

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