Compressive performance of carbon fibres: experiment and analysis

VinÇon, I.; Allix, Olivier; Sigety, P.; Auvray, M.-H.

doi:10.1016/s0266-3538(97)00235-2

Cited by 11 publications

(6 citation statements)

References 22 publications

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“…This criterion is a major issue in the prediction of the compressive failure of fiber composites, discussed in many works including Vinçon et al 45 and Drapier et al 46 In this study, ε f has been taken equal to 0.01, but changing this value has absolutely no effect on the failure stress of the laminate, as was already known since. 47 However, it has a first-order impact on the total dissipated energy.…”

Section: Materials Modelingmentioning

confidence: 90%

Micro-mechanical prediction of UD laminates behavior under combined compression up to failure: influence of matrix degradation

Feld

Allix

Baranger

et al. 2011

Journal of Composite Materials

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This article aims to model the behavior of carbon fiber-reinforced polymer laminates up to failure and predict the corresponding energy absorption, under mixed loadings involving compression. In Guimard JM, Allix O, Pechnik N and Thévenet P. [Statistical energy and failure analysis of CFRP compression behavior using a uniaxial microbuckling model. J Compos Mater 2007; 41: 2807–2828], a simplified 2D micro-model has been used in order to assess the influence of the fiber misalignment parameters on the micro-structural compression behavior, both in terms of critical stresses and dissipated energies. This article goes further by introducing the influence of a shear pre-stress and by considering an inelastic and damageable constitutive behavior for the matrix and not only an inelastic one as it is done in the literature. Together with fiber waviness, these three parameters are proven to be critical for the simulation of the kinking phenomenon. Particularly, the main effect of the damageable behavior of the matrix is to avoid unrealistically high hardening of the epoxy. This affects the results significantly and allows a better correlation of the model with experimental data. It is shown, by a statistical analysis, that failure stresses are sensitive to both shear pre-stresses and fiber waviness. Dissipated energies and kink-band size are found to be affected by a shear pre-stress as well but rather less sensitive to fiber waviness.

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Section: Materials Modelingmentioning

confidence: 90%

Micro-mechanical prediction of UD laminates behavior under combined compression up to failure: influence of matrix degradation

Feld

Allix

Baranger

et al. 2011

Journal of Composite Materials

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“…Separating the matrix terms from the fibers terms, the virtual power principle leads to (11). After some simplifications (neglecting the secondorder buckling mode in the pre-stress term) and calculations (12), we obtain the final equation ( 13), which has two non-linear terms: a geometric non-linearity due to the fiber's imperfection and a material non-linearity due to plasticity of the matrix. Through two integrations by parts, one can verify that this is in complete aggrement with the initial equilibrium equation (written with rotations) used in the Fleck and Budiansky's model [14]:…”

Section: Main Assumptionsmentioning

confidence: 99%

“…Today, it is clear that for CFRP the wavy nature of such defects has been positively observed by many authors [11][12][13] and may act as a trigger, just like matrix plasticity. Therefore, we will concentrate our efforts on the dependence of the critical energy upon these parameters.…”

Section: Introductionmentioning

confidence: 99%

Statistical Energy and Failure Analysis of CFRP Compression Behavior Using a Uniaxial Microbuckling Model

Guimard

Allix

Pechnik

et al. 2007

Journal of Composite Materials

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Compression failure followed by fragmentation is a pre-eminent energy absorption mechanism in fiber-reinforced composites and, therefore, it is often used in crash absorption devices. Fragmentation is the last stage of degradation leading to total failure of a carbon fiber reinforced plastic (CFRP) laminate in compression. Micromechanical studies have shown that this phenomenon is initiated mainly by a microbuckling mechanism which depends on microstructural imperfections (fiber misalignment and matrix plasticity). As far as energy absorption and dedicated modeling strategies are concerned, the question is whether the failure scenario is dependent on these imperfections in terms of dissipated energy. In this context, we used a one-dimensional microscale approach to model plastic microbuckling and evaluate the corresponding dissipated energy for a realistic range of microstructural parameters (with statistical treatment). Contrary to our expectations and to the well-known sensitivity of the peak loads, these energies seem unaffected by microscopic parameters. In conclusion, we propose some ideas on how to include the main aspects of fragmentation, which can occur in composite materials under in-plane compression loading, on the mesoscale.

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“…In other words, compressive strength is not only a material property, but it depends on structural data like specimen size, stacking sequences of composite laminates or loading conditions. In the same spirit, it was experimentally established that a single carbon fiber embedded in an epoxy resin is able to bear higher compressive stress than in tension [7]. One can also mention that the reliability of some pure compression tests is questionable.…”

Section: Introductionmentioning

confidence: 97%

Compressive failure of composites: A computational homogenization approach

Nezamabadi

Potier‐Ferry

Zahrouni

et al. 2015

Composite Structures

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International audienceThis paper revisits the modeling of compressive failure of long fiber composite materials by considering a multiscale finite element approach. It is well known that this failure follows from a fiber microbuckling phenomenon. Fiber microbuckling is governed by both material and geometrical quantities: the elastoplastic shear behavior of the matrix and the fiber misalignment. Although all these parameters are easily accounted by a finite element analysis at the local level, the failure is also influenced by macrostructural quantities. That is why a multilevel finite element model (FE²) is relevant to describe the compressive failure of composite. Furthermore, fiber local buckling leads to a loss of ellipticity of the macroscopic model, which can be a criterion of failure

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Compressive performance of carbon fibres: experiment and analysis

Cited by 11 publications

References 22 publications

Micro-mechanical prediction of UD laminates behavior under combined compression up to failure: influence of matrix degradation

Micro-mechanical prediction of UD laminates behavior under combined compression up to failure: influence of matrix degradation

Statistical Energy and Failure Analysis of CFRP Compression Behavior Using a Uniaxial Microbuckling Model

Compressive failure of composites: A computational homogenization approach

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