Please use this identifier to cite or link to this item: http://repositorio.unicamp.br/jspui/handle/REPOSIP/328647
Type: Artigo
Title: Shear Properties Of Carbon Fiber/phenolic Resin Composites Heat Treated At High Temperatures
Author: Silva
Homero Paula; Pardini
Luiz Claudio; Bittencourt
Edison
Abstract: Carbon fiber/phenolic resin composites have long been used as ablative materials in rocketry. Ablation is a complex multiscale problem where radiative and convective heating leads to the pyrolysis of phenolic resin matrix, resulting in the formation of a porous insulation char as thermal protection. This study investigates the shear properties evolution during the heat treatment of a carbon fiber/phenolic resin nozzle extension entrance (exit cone) which is part of an integrated nozzle of launching and sounding vehicles, developed at the Instituto de Aeronautica e Espaco (SP), Brazil. Specimens of the material (carbon fiber/phenolic resin composite) were subjected to heat treatment at 500, 1,000, 1,500 and 2,000 degrees C, and measurements of shear strength and shear modulus were performed using the Iosipescu mode. Experimental data were compared with the results obtained theoretically. Also, morphological analysis was accomplished by optical microscopy and the observation of fractured surfaces, by scanning electron microscopy. Significant morphological changes in the microstructure after heat treatments were observed. The lowest value for shear strength obtained experimentally was 4.05 MPa, which is greater than the ultimate value obtained analytically (2.35 MPa), fulfilling its structural function during the propulsion time.
Subject: Ablation
Carbon-phenolic
Shear Strength
Editor: Inst Aeronautica & Espaço-IAE
São Paulo
Rights: aberto
Identifier DOI: 10.5028/jatm.v8i3.643
Address: http://www.jatm.com.br/ojs/index.php/jatm/article/view/643
Date Issue: 2016
Appears in Collections:Unicamp - Artigos e Outros Documentos

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