Repositorio
Institucional

Melendrez, Manuel

Salas, Alexis

Onate, Angelo

Escudero, Benjamin

Medina, Carlos

Tuninetti, Victor

Effect of 0.5% CNT reinforcement of a glass fiber composite on strength and cyclic damage induced by transverse and out-of-plane compressive loads

SAGE PUBLICATIONS LTD

JOURNAL OF COMPOSITE MATERIALS

en

The impact of the addition of 0.5 wt% multiwall carbon nanotubes (MWCNT) on the quasi-static transverse compressive resistance and damage evolution of unidirectional glass fiber reinforced composite (FRC) fabricated by resin transfer molding is investigated. The degradation of macroscopic mechanical properties such as elastic modulus and compressive strength vs. plastic strains are correlated with crack density and microcrack propagation behavior including analysis of failure phenomena such as interface debonding, matrix cracking and interface cracking. The experimental campaign includes compression tests with monotonic and cyclic loads on cubic specimens in the out-of-plane (0 degrees) and transverse (90 degrees) directions for masterbatch MWCNT-based and CNT-free glass FRC. In the monotonic case, the elastic modulus and maximum compressive strength increased for the glass FRC with 0.5 wt% CNTs, particularly in the transverse (0 degrees) direction by 11% and 13%, respectively. Under cyclic loading, the elastic modulus degradation stagnates at a lower plastic deformation for composite with 0.5 wt% CNTs. In addition, CNTs reduces by 20% the cumulative plastic deformation in the 0 degrees direction and almost 30% in the 90 degrees direction. At the microscopic scale, image analysis showed that the CNTs improved the properties of the interface by delaying decohesion failure and reducing by around 30% and 40% the computed crack density in the 0 degrees and 90 degrees loading direction, respectively. In addition, image analysis in the out-of-plane direction (0 degrees) shows that fiber-matrix decohesion is predominant before crack propagation at the interlaminar level and prior to final failure. By contrast, at 90 degrees loadings, no decohesion is observed and crack propagation is almost purely interlaminar. Finally, the addition of 0.5% MWCNTs to the glass FRC increases the mechanical resistance of the composite material in the transverse direction demonstrated by the delaying of cracks during the failure analysis of different cycles as well as the decrease of the elastic modulus degradation and increase of compressive strength.

artículo original

This work was supported by the National Commission for Scientific and Technological Research (CONICYT) through the FONDECYT projects 11160285, 11170002 and 1201338.

Este trabajo contó con el apoyo de la Comisión Nacional de Investigaciones Científicas y Tecnológicas (CONICYT) a través de los proyectos FONDECYT 11160285, 11170002 y 1201338.

10.1177/00219983221106522

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Compression

Out of plane

Damage evolution

Carbon Nanotube

Fiber Reinforced Composite

Crack density

Cyclic loadings

CARBON NANOTUBE

UNIDIRECTIONAL COMPOSITES

EPOXY COMPOSITES

MECHANICAL-BEHAVIOR

POLYMER COMPOSITES

FAILURE CRITERIA

FATIGUE BEHAVIOR

CRACK FORMATION

SHEAR-STRENGTH

TENSILE

Ciencia de Materiales

Compuestos

Compresión

Fuera del plano

Evolución de daños

Nanotubo de carbono

Compuesto reforzado con fibra

Densidad de grietas

Cargas cíclicas

NANOTUBO DE CARBONO

COMPUESTOS UNIDIRECCIONALES

COMPUESTOS EPOXI

COMPORTAMIENTO MECÁNICO

COMPUESTOS DE POLÍMERO

CRITERIOS DE FALLA

COMPORTAMIENTO DE FATIGA

FORMACIÓN DE GRIETAS

RESISTENCIA AL CIZALLAMIENTO

DE TENSIÓN

Effect of 0.5% CNT reinforcement of a glass fiber composite on strength and cyclic damage induced by transverse and out-of-plane compressive loads

2895

2906

artículo original

version publicada

0

metadata

metadata

ANID-FONDECYT 11160285

ANID-FONDECYT 11170002

ANID-FONDECYT 1201338

ANID FONDECYT 11160285

ANID FONDECYT 11170002

ANID FONDECYT 1201338

WOS:000810983900001