Effect of matrix damage on compressive strength in the fiber direction for laminated composites

Eyer, Gabriel; Montagnier, Olivier; Hochard, Christian; Charles, Jean-Paul

doi:10.1016/j.compositesa.2016.12.012

Cited by 25 publications

(12 citation statements)

References 23 publications

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“…As mentioned in the introduction, this strength loss is assumed to derive from the matrix's loss of capacity to transfer loads between all the fibres when fibre-matrix decohesion and matrix cracks exceed a threshold. The same trend was observed by Hochard et al for tensile [23] and compressive [41] residual strength on tubes damaged under torsion fatigue loading.…”

Section: Residual Tensile Strength Of [0/90] 2s Specimenssupporting

confidence: 72%

A method to determine composite material residual tensile strength in the fibre direction as a function of the matrix damage state after fatigue loading

Caous

Bois

Wahl

et al. 2017

Composites Part B: Engineering

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is an open access repository that collects the work of Arts et Métiers ParisTech researchers and makes it freely available over the web where possible. The phenomenon of residual strength in composite laminates after fatigue loading has been studied for decades but is generally expressed as a function of the number of cycles applied to the specimens. Phenomenological laws deduced from these tests are therefore loading dependent and identifying a valid model for any loading condition of a given laminate requires long fatigue testing campaigns. To overcome this difficulty, a testing procedure is proposed to express the residual tensile strength of a unidirectional ply in the fibre direction, as a function of its matrix damage. The resulting behaviour is then independent of the imposed loading and can be determined by only a few fatigue tests. Experimental results obtained on glass-epoxy non-crimp fabric laminates are presented and analysed.

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Section: Residual Tensile Strength Of [0/90] 2s Specimenssupporting

confidence: 72%

A method to determine composite material residual tensile strength in the fibre direction as a function of the matrix damage state after fatigue loading

Caous

Bois

Wahl

et al. 2017

Composites Part B: Engineering

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“…However, carbon-fibre/epoxy composites do have their own drawbacks. For example, the weak through-thickness strength in laminated structures makes them susceptible to impact damage [1,2]. Moreover, induced damage may not be visible but may, nonetheless, significantly reduce a laminate`s residual compressive strength.…”

Section: *Manuscript Click Here To View Linked Referencesmentioning

confidence: 99%

Predicting the Compression-After-Impact (CAI) strength of damage-tolerant hybrid unidirectional/woven carbon-fibre reinforced composite laminates

Liu

Falzon

Tan

2018

Composites Part A: Applied Science and Manufacturing

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The evaluation of Compression-After-Impact (CAI) strength is of great significance in the design of composite aerostructures. This paper presents a model for the numerical simulation of Compression-After-Impact (CAI) of hybrid unidirectional (UD)/woven carbon-fibre reinforced composite laminates. This three-dimensional damage model is based on Continuum Damage Mechanics (CDM) and Linear Elastic Fracture Mechanics (LEFM), and implemented as a user defined material subroutine (VUMAT) in Abaqus/Explicit. This model, which accounts for interlaminar and intralaminar damage, and load reversal, incorporates a non-linear shear profile to account for matrix plasticity. Two different composite laminate lay-ups with varying extent of initial impact damage were tested to validate the computational model and enable a quantitative study of the influence of using woven plies on the surfaces of a laminate. Woven surface plies are often used in composite aerostructures to mitigate damage during drilling and constrain the extent of damage during low velocity impact. Good correlation was obtained between physical testing and simulation results, which establishes the capability of this damage model in predicting the structural response of composite laminates. The fully validated model was used to compare the Compression-After-Impact (CAI) strength of an equivalent unidirectional (UD)-only carbon-fibre reinforced composite laminate. The results showed that the hybrid unidirectional (UD)/woven laminate had a marginally higher strength (+3.3%) than the equivalent unidirectional (UD)-only laminate.

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“…Ce papier s'est architecturé en plusieurs étapes afin d'étudier l'influence de l'alignement des fibres sur la résistance en compression sens fibre. Dans un premier temps, des résultats issus de [15,16] ont été présentés. Ces résultats montrent que l'endommagement matriciel joue un rôle important dans la résistance des composites en compression sens fibre.…”

Section: Resultsunclassified

“…Même si ce papier se focalise sur l'influence d'un défaut d'alignement global des fibres sur la rupture en compression, le cadre général de ce travail concerne l'influence de l'endommagement transverse sur le comportement en compression sens fibres [15,16]. Pour répondre à cette problématique, il a été nécessaire de proposer des méthodes et des essais permettant à la fois d'endommager la matrice et de réaliser la compression sens fibre.…”

Section: Choix Des Essaisunclassified

Influence de l’alignement des fibres sur la rupture des composites en compression sens fibre

Eyer

Montagnier

Charles

et al. 2016

Matériaux & Techniques

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Effect of fibers alignment on the failure of composites in compression in the fiber direction. This work deals with the measurement and modeling of compressive strength in the fiber direction for unidirectional carbon/epoxy composite, and focuses on the influence of the global misalignment angle of the fibers. At first, from previous experimental results, it is shown that the presence of diffuse damage in the matrix significantly modify the compressive strength. A mesoscale model based on matrix damage variable is given to account for the phenomenon. Secondly, these results are applied to the case of specimens with global misalignment angle. It will be shown that in this case, the problem becomes complex since misalignment of the fibers and matrix damage are coupled. Finally, from an original compression test specimens with stress concentration, we show the interest to take into account the matrix damage state for predicting the failure.

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Effect of matrix damage on compressive strength in the fiber direction for laminated composites

Cited by 25 publications

References 23 publications

A method to determine composite material residual tensile strength in the fibre direction as a function of the matrix damage state after fatigue loading

A method to determine composite material residual tensile strength in the fibre direction as a function of the matrix damage state after fatigue loading

Predicting the Compression-After-Impact (CAI) strength of damage-tolerant hybrid unidirectional/woven carbon-fibre reinforced composite laminates

Influence de l’alignement des fibres sur la rupture des composites en compression sens fibre

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