Measurement of the in situ ply fracture toughness associated with mode I fibre tensile failure in FRP. Part II: Size and lay-up effects

Laffan, M.J.; Pinho, S.T.; Robinson, P.; Iannucci, L.

doi:10.1016/j.compscitech.2009.12.011

Cited by 93 publications

(86 citation statements)

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“…The translaminar fracture toughness of a UD composite increases with the size of the cross section (Figure 8b and 15). This has been directly observed in CT specimens with blocked ply thickness (Laffan et al, 2010); it is also supported by a significant toughening effect observed in discontinuous recycled composites due to pull-out and failure of large bundles Pinho, 2014, Pimenta et al, 2010).…”

Section: Experimental Validationmentioning

confidence: 60%

“…T300/913 (Pinho et al, 2006a), T300/920 (Laffan et al, 2010) tion (through the matrix/interface shear-lag strength parameter τ SL ).…”

Section: Validation Against Experimental Resultsmentioning

confidence: 99%

“…This follows experimental evidence of free surfaces or discontinuities triggering failure; for instance, in cross-ply CT specimens, failure starts at the 0 • /90 • interface and propagates inwards to the 0 • plies (Laffan et al, 2010, Pinho et al, 2006a. Beyerlein and Phoenix, 1996), this approximation is necessary to verify the discrete hierarchical failure process.…”

Section: Geometry Of Quasi-fractal Surfacesmentioning

confidence: 99%

“…The measured translaminar toughness of the thicker layers was nearly twice the value for the thinner ones, reportedly due to much larger pull-out features (Figure 1). Subsequent finite elements simulations of open-hole specimens (Chen et al, 2013) proved that incorporating such dependence in numerical models is crucial to Figure 1: Size effects on the translaminar fracture of UD carbon-epoxy plies (after Laffan et al, 2010).…”

Section: Introductionmentioning

confidence: 99%

“…Composites are orders of magnitude tougher than their constituents, due to the formation of intricate 3D fracture surfaces with large interfacial debonds and pulled-out fibres and bundles (Figures 1 and 2). Laffan et al (2010) recently reported size effects on the translaminar toughness of FRPs, by testing cross-ply Compact Tension (CT) specimens with 0.125 or 0.250 mm thick 0 • layers. The measured translaminar toughness of the thicker layers was nearly twice the value for the thinner ones, reportedly due to much larger pull-out features (Figure 1).…”

Section: Introductionmentioning

confidence: 99%

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An analytical model for the translaminar fracture toughness of fibre composites with stochastic quasi-fractal fracture surfaces

Pimenta

Pinho

2014

Journal of the Mechanics and Physics of Solids

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The translaminar fracture toughness of fibre-reinforced composites is a size-dependent property which governs the damage tolerance and failure of these materials. This paper presents the development, implementation and validation of an original analytical model to predict the tensile translaminar (fibre-dominated) toughness of composite plies and bundles, as well as the associated size effect. The model considers, as energy dissipation mechanisms, debonding and pull-out of bundles from quasi-fractal fracture surfaces; the corresponding lengths are stochastic variables predicted by the model, based on the respective bundle strength distributions and fracture mechanics. Parametric studies show that composites are toughened by stronger fibres with large strength variability, and intermediate values of interfacial toughness and friction. Predictions are validated against four different composite ply systems tested in the literature, proving the models ability to capture not only size effects, but also the influence of different fibres and resins.

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Section: Experimental Validationmentioning

confidence: 60%

“…T300/913 (Pinho et al, 2006a), T300/920 (Laffan et al, 2010) tion (through the matrix/interface shear-lag strength parameter τ SL ).…”

Section: Validation Against Experimental Resultsmentioning

confidence: 99%

Section: Geometry Of Quasi-fractal Surfacesmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

See 3 more Smart Citations

An analytical model for the translaminar fracture toughness of fibre composites with stochastic quasi-fractal fracture surfaces

Pimenta

Pinho

2014

Journal of the Mechanics and Physics of Solids

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Translaminar fracture toughness and fatigue crack growth characterization of carbon‐epoxy plain weave laminates

Souza

Nascimento²,

Silveira

et al. 2019

Polymer Composites

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An experimental investigation of mode-I translaminar fracture toughness and fatigue crack growth behavior of a carbon fiber-epoxy plain weave laminate manufactured by resin infusion under flexible tooling (RIFT) is presented in this article. Pre-cracked compact tension (CT) specimens were used to perform both quasi-static and fatigue tests. Different data reduction techniques for fracture toughness calculation were used and compared with each other. The ASTM E399 test method was modified to account for the material orthotropy and specimen geometry effects using a correction function based on a numerical evaluation of the strain energy release rate. The proposed modification shows good agreement against other experimental methods found in the literature and its application was validated for fatigue tests. Fatigue testing shows that failure in undesired modes is likely to occur prior to translaminar fracture, which was attributed to a higher tensile fatigue threshold than compression or shear fatigue threshold presented by the composite in analysis. Increasing the specimens' initial notch length was a solution for avoiding these types of failure. The experimental results were compiled in the form of a Paris curve, and their particularities were discussed. A fractographic analysis was carried out to define damage patterns and its evolution process in both types of tests. POLYM. COMPOS., 40:3791-3804, 2019. POLYMER COMPOSITES-2019 FIG. 4. Finite element model of CT specimen. FIG. 5. Typical load-displacement curve obtained in a quasi-static test.

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Mechanical response and critical failure mechanism characterization of notched carbon fiber reinforced polymer laminate subjected to tensile loading

Wang

et al. 2020

Polymer Composites

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The purpose of this article is to investigate the mechanical responses and critical failure mechanisms of notched composite laminates with the aid of numerical and experimental approaches, considering the effect of notch geometry, notch size and off-axis angle. Quasi-static tensile tests are implemented to study the influence of design variables on the mechanical response, during which the relationship of force vs displacement and strain distributions are collected by means of digital image correlation technique. Subsequently, the numerical simulation is implemented in ABAQUS/Explicit through a progressive damage model integrated with a VUMAT subroutine. Meanwhile, the initiation and propagation of damage are explored through the damage morphologies, combining with the logarithmic strain components from numerical predictions. Results show that notch strength and failure strain are more closely associated with off-axis angle and notch size compared with notch geometry. In addition, with the increase of off-axis angle, the contribution of fiber is increasingly weakened, the damage mode gradually varies from fiber fracture to pull out accompanied with the damage near the notch changing from fiber fracture to delamination. Meanwhile, the critical failure mechanism varies from tension dominated to tension-shear/ shear dominated as the off-axis angle grows larger. K E Y W O R D S composite laminates, digital image correlation, failure mechanism, notch strength 1 | INTRODUCTION Carbon fiber reinforced polymer (CFRP) laminate has been increasingly applied in light of its outstanding performance and superior damage tolerance. Compared with traditional materials, it has many typical advantages, such as high specific strength and stiffness, [1-3] improved impact and fatigue resistance, [4-6] perfect corrosion resistance and moistureproof ability, [7] and so forth. During the application, in addition to the complicated loading conditions, the unavoidable notches for mechanical connections also pose a risk to the load-bearing capacity and service life. In addition, notch geometry and notch size are usually diversified to facilitate the connection of structural components, which significantly diminishes the mechanical properties and further complicates the exploration of mechanical behaviors. Furthermore, due to the anisotropy, brittleness, heterogeneity, and obvious difference between the interlaminar and intralaminar property, damage patterns, and failure mechanisms of composites also present complexity and diversity. [8]

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Measurement of the in situ ply fracture toughness associated with mode I fibre tensile failure in FRP. Part II: Size and lay-up effects

Cited by 93 publications

References 9 publications

An analytical model for the translaminar fracture toughness of fibre composites with stochastic quasi-fractal fracture surfaces

An analytical model for the translaminar fracture toughness of fibre composites with stochastic quasi-fractal fracture surfaces

Translaminar fracture toughness and fatigue crack growth characterization of carbon‐epoxy plain weave laminates

Mechanical response and critical failure mechanism characterization of notched carbon fiber reinforced polymer laminate subjected to tensile loading

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