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Hygrothermal effects on the translaminar fracture toughness of cross-ply carbon/epoxy laminates: Failure mechanisms

The present work addresses the damage mechanisms of polymer-based laminated composite materials under different hygrothermal conditions by means of the translaminar fracture toughness using Double Edge Notched Tensile tests of a cross-ply laminate manufactured with T800S/M21 carbon/epoxy material.Three different conditions were considered: as received-room temperature (AR/RT), wet-room temperature (WET/RT), and wet-high temperature (WET/HOT). The highest fracture toughness was for WET/HOT and the lowest for WET/RT. To observe the corresponding failure mechanisms, Scanning Electronic Microscopy (SEM) analysis was performed. The SEM inspections show that the pull-out length and the frictional coefficient are the most significant parameters that best explain the differences observed in the crack propagation and the fracture toughness. For AR/RT, the suitable adhesion between components allows stresses to be transferred from the matrix to the fibers, so the crack is practically continuous in the same failure plane and the pull-out is barely visible. However, higher pull-out lengths can be observed in WET/RT and WET/HOT, especially in the second one. For WET/RT, the crack surface shows fiber bundles at different pull-out lengths, while for WET/HOT fibers are broken individually at longer pull-out lengths. According to the moisture absorption in WET/RT and WET/HOT, a lower frictional coefficient is thought to slightly reduce the fracture toughness, which can be compared between AR/RT and WET/RT. Nevertheless, the highest fracture toughness is caused by the large pull-out lengths in WET/HOT tests, despite the reduction of the frictional coefficient

The authors acknowledge the financial support of the Spanish Government under project MAT2013-46749-R. The first author would like to thank the Spanish Government for the FPI predoctoral grant BES-2010-042387 and for the mobility grant EEBBI-13-06186

© Composites Science and Technology, 2016, vol. 122, p. 130-139

Elsevier

Author: Marín Hernández, Lorena
González Juan, Emilio Vicente
Maimí Vert, Pere
Trias Mansilla, Daniel
Camanho, Pedro Manuel Ponces Rodrigues de Castro
Date: 2016 January 18
Abstract: The present work addresses the damage mechanisms of polymer-based laminated composite materials under different hygrothermal conditions by means of the translaminar fracture toughness using Double Edge Notched Tensile tests of a cross-ply laminate manufactured with T800S/M21 carbon/epoxy material.Three different conditions were considered: as received-room temperature (AR/RT), wet-room temperature (WET/RT), and wet-high temperature (WET/HOT). The highest fracture toughness was for WET/HOT and the lowest for WET/RT. To observe the corresponding failure mechanisms, Scanning Electronic Microscopy (SEM) analysis was performed. The SEM inspections show that the pull-out length and the frictional coefficient are the most significant parameters that best explain the differences observed in the crack propagation and the fracture toughness. For AR/RT, the suitable adhesion between components allows stresses to be transferred from the matrix to the fibers, so the crack is practically continuous in the same failure plane and the pull-out is barely visible. However, higher pull-out lengths can be observed in WET/RT and WET/HOT, especially in the second one. For WET/RT, the crack surface shows fiber bundles at different pull-out lengths, while for WET/HOT fibers are broken individually at longer pull-out lengths. According to the moisture absorption in WET/RT and WET/HOT, a lower frictional coefficient is thought to slightly reduce the fracture toughness, which can be compared between AR/RT and WET/RT. Nevertheless, the highest fracture toughness is caused by the large pull-out lengths in WET/HOT tests, despite the reduction of the frictional coefficient
The authors acknowledge the financial support of the Spanish Government under project MAT2013-46749-R. The first author would like to thank the Spanish Government for the FPI predoctoral grant BES-2010-042387 and for the mobility grant EEBBI-13-06186
Format: application/pdf
ISSN: 0266-3538
Document access: http://hdl.handle.net/10256/12721
Language: eng
Publisher: Elsevier
Collection: MINECO/PE 2014-2017/MAT2013-46749-R
Reproducció digital del document publicat a: http://dx.doi.org/10.1016/j.compscitech.2015.10.020
Articles publicats (D-EMCI)
Is part of: © Composites Science and Technology, 2016, vol. 122, p. 130-139
Rights: Tots els drets reservats
Subject: Medi ambient -- Degradació
Environmental degradation
Microscòpia electrònica d’escombratge
Scanning electron microscopy
Materials laminats -- Fractura
Laminated materials -- Fracture
Assaigs de materials
Materials -- Testing
Title: Hygrothermal effects on the translaminar fracture toughness of cross-ply carbon/epoxy laminates: Failure mechanisms
Type: info:eu-repo/semantics/article
Repository: DUGiDocs

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