Damage accumulation in woven-fabric CFRP laminates under tensile loading: Part 1. Observations of damage accumulation

Gao, Fei; Boniface, L.; Ogin, S.L.; Smith, Paul A.; Greaves, R.P.

doi:10.1016/s0266-3538(97)00231-5

Cited by 133 publications

(78 citation statements)

References 8 publications

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“…Unlike the transverse cracking observed in weft tows of woven laminates under tensile loading investigated in Refs. [11,12], longitudinal cracking of these tows along the specimen's axis was found under flexural load in this study. From the microscopic analysis, it can be asserted that this cracking is the predominant damage mechanism at low-stress regions before the final failure of the laminate.…”

Section: Analysis Of Damage In Tested Compositessupporting

confidence: 54%

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Characterisation of mechanical behaviour and damage analysis of 2D woven composites under bending

Ullah

Harland

Silberschmidt

2015

Composites Part B: Engineering

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Additional Information:• NOTICE: this is the author's version of a work that was accepted for publication in Composites Part B: Engineering. Changes resulting from the publishing process, such as peer review, editing, corrections, structural formatting, and other quality control mechanisms may not be reflected in this document.Changes In this paper, flexural loading of woven carbon fabric-reinforced polymer laminates is studied using a combination of experimental material characterisation, microscopic damage analysis and numerical simulations. Mechanical behaviour of these materials was quantified by carrying out tensile and largedeflection bending tests. A substantial difference was found between the materials' tensile and flexural properties due to a size effect and stress stiffening of thin laminates. A digital image-correlation technique capable of full-field strain-measurement was used to determine in-plane shear properties of the studied materials. Optical microscopy and micro-computed tomography were employed to investigate deformation and damage mechanisms in the specimens fractured in bending. Various damage modes such as matrix cracking, delaminations, tow debonding and fibre fracture were observed in these microstructural studies. A two-dimensional finite-element (FE) model was developed to analyse the onset and propagation of inter-ply delamination and intra-ply fabric fracture as well as their coupling in the fractured specimen. The developed FE model provided a correct prediction of the material's flexural response and successfully simulated the sequence and interaction of damage modes observed experimentally.

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Section: Analysis Of Damage In Tested Compositessupporting

confidence: 54%

“…Several studies can be found on the investigation of damage in composites subjected to tensile loadings [11,12]. However, damage of woven composites under large bending deformation is rarely studied; thus, more research work is required for better understanding of such damage phenomena.…”

Section: Introductionmentioning

confidence: 99%

Characterisation of mechanical behaviour and damage analysis of 2D woven composites under bending

Ullah

Harland

Silberschmidt

2015

Composites Part B: Engineering

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“…Most of the studies on composite cracking limit their observation to the edge of the specimen [4][5][6][7]. In this study due to the presence of stitching, the specimen edges are not representative of what occurs inside the material.…”

Section: Analysis Methodsmentioning

confidence: 99%

Introduction to the Characterization of Hygrothermal Microcracking of Crossply Composites Reinforced by Stitched Non-Woven UD Laminae

Liotier

Vautrin

Béraud

et al. 2008

AMM

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Abstract. This article presents a first approach of hygrothermal microcracking in stitched crossply laminates. The presentation includes the definition of the material mesostructure and the selection of a characterization method adapted to the specificity of the study. The hygrothermal loading selected is discussed and the evolution of the crack density in stitched crossply composites during the loading is presented and commented.

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“…La relación entre la arquitectura del textil y la acumulación del daño bajo carga en tensión ha sido investigado par varios autores (Gao et al, 1999), (Ramakrishna et al, 1994) y (Bohse, 2004). Por otro lado, en este trabajo de investigación la téc-nica de la emisión acústica ha sido empleada para apoyar el análisis del comportamiento mecánico por efecto de la geometría del tejido.…”

Section: Identificación De Mecanismos De Fractura En Compositos Reforunclassified

“…Gao et al (1999) determinaron la relación existente entre la generación de grietas y la arquitectura de un refuerzo textil tipo petatillo (woven) en matriz epóxica empleando la emisión acústica como medio para relacionar los eventos (señales que exceden el valor mínimo del umbral) con la curva de esfuerzo-deformación. Sin lugar a dudas, esta técnica ha permitido relacionar fuentes de iniciación de fallas para ser relacionados con el comportamiento observado en las curvas de esfuerzo-deformación con el objeto de atribuir las diferentes etapas del proceso del daño producido al efecto del arreglo de las fibras en el material de refuerzo.…”

Section: Introductionunclassified

Detección del daño generado en materiales compuestos de matriz polimérica empleando la técnica de emisión acústica

Cauich-Cupul¹,

Rodriguez-Laviada²,

Ríos-Soberanis³

2008

IIT

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ResumenCon el objeto de predecir el comportamiento mecánico de un material compuesto durante su vida de servicio es importante monitorear el inicio y desarrollo de las fallas y los efectos producidos por los distintos medios de degradación, además la aparición de grietas está relacionada con la integridad estructural del componente y su vida durante la fatiga. Ésta, entre otras razones, ha motivado el empleo de técnicas no destructivas, tales como la emisión acústica (EA) para el análisis intrínseco de las propiedades mecánicas de un material. El método EA, ha demostrado excelentes resultados en la detección e identificación de sitios de iniciación, propagación y desarrollo de fallas y mecanismos de fractura de materiales compuestos manufacturados con matriz polimérica, asimismo, la posibilidad de relacionar los modos de fractura con la geometría del refuerzo. El objetivo de este trabajo es remarcar la importancia de la emisión acústica como herramienta para detectar los parámetros mecánicos al caracterizar los materiales en respuesta a los esfuerzos externos y en procesos de degradación. Los resultados obtenidos en diversos estudios son presentados para apoyar la investigación en la detección del daño en los composites, de esta manera, involucrar totalmente los beneficios de la emisión acústica en la caracterización de materiales compuestos.Descriptores: Materiales compuestos, mecanismos de fractura, emisión acústica. Abstract In order to predict the mechanical behaviour of a composite during its service life, it is important to study the initiation and development of cracks and its effects induced by degradation. The onset of damage is related to the structural integrity of the component and its fatigue life. For this, among other reasons, non-destructive techniques have been widely used nowadays in composite materials characterization such as acoustic emission (AE

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Damage accumulation in woven-fabric CFRP laminates under tensile loading: Part 1. Observations of damage accumulation

Cited by 133 publications

References 8 publications

Characterisation of mechanical behaviour and damage analysis of 2D woven composites under bending

Characterisation of mechanical behaviour and damage analysis of 2D woven composites under bending

Introduction to the Characterization of Hygrothermal Microcracking of Crossply Composites Reinforced by Stitched Non-Woven UD Laminae

Detección del daño generado en materiales compuestos de matriz polimérica empleando la técnica de emisión acústica

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