Interlaminar Stresses in Composite Laminates Under Uniform Axial Extension

Pipes, R. Byron; Pagano, N. J.

doi:10.1177/002199837000400409

Cited by 947 publications

(230 citation statements)

References 6 publications

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“…Free edges are another important cause of interlaminar stresses [11]. The material discontinuities owing to the different ply orientations cause stress singularities.…”

Section: (C) Localized Interlaminar Stressesmentioning

confidence: 99%

The role of delamination in failure of fibre-reinforced composites

Wisnom

2012

Phil. Trans. R. Soc. A.

220

119

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The mechanisms by which delamination contributes to the failure of fibre-reinforced composites are reviewed. Through-thickness failure owing to interlaminar stresses is considered first, and the effect of delamination in impact and compression after impact. The way in which in-plane failure can occur by delamination and matrix cracks joining up to produce a fracture surface without the need to break fibres is considered next. Examples of quasi-isotropic laminates loaded at different off-axis angles, and with different numbers and thicknesses of ply blocks show large differences in unnotched tensile strength controlled by delamination from the free edge. Similar mechanisms determine the strength of notched specimens and give rise to the hole size effect, whereby tensile strength increases with decreasing hole diameter owing to increased delamination and splitting. Open hole tension and over-height compact tension tests with constant inplane dimensions show a transition in failure mode with increasing ply block thickness from fibre-dominated fracture to complete delamination. In all these cases, the critical factor controlling strength is the relative propensity to delaminate.

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“…Free edges are another important cause of interlaminar stresses [11]. The material discontinuities owing to the different ply orientations cause stress singularities.…”

Section: (C) Localized Interlaminar Stressesmentioning

confidence: 99%

The role of delamination in failure of fibre-reinforced composites

Wisnom

2012

Phil. Trans. R. Soc. A.

220

119

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“…Failure due to delamination is one of the important behavioral aspects, which needs prime attention. It has been concluded from investigations by Pipes and Pagano [1] and Rybicki [2] that high interlaminar stresses on the free edge of laminates cause edge delamination. A theory that can predict all these stresses accurately is certainly desired for a clear understanding of the failure mechanism involved in the delamination of laminated composites.…”

Section: Introductionmentioning

confidence: 99%

Natural Vibrations of Laminated Composite Beams by Using Mixed Finite Element Modelling

Ramtekkar¹,

Desai²,

Shah

2002

Journal of Sound and Vibration

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“…The behavior of the free-edge is still important subject to study in the future. Pipes and Pagano (1970) proposed the quasithree dimensional analysis and showed a stress concentration at the free-edge of the laminates by performing the analysis of symmetric angle-ply laminates. Although their study was remarkable in which they developed a basis methodd for the future study, they clarified the delamination onset by the interlamina stress qualitatively, not quantitatively.…”

Section: Introductionmentioning

confidence: 99%

“…Although their study was remarkable in which they developed a basis methodd for the future study, they clarified the delamination onset by the interlamina stress qualitatively, not quantitatively. On the other hand, O'Brien (1982), Aoki and Kondo (1989) tried to explain the delamination growth by calculating the strain energy release rate at tip of the delamination.…”

Section: Introductionmentioning

confidence: 99%

Ultimate strength of composite laminates with free-edge delamination

Kim¹,

Kang

Onohara

1999

KSME International Journal

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The present paper deals with the free edge effect of composite laminates by using a generalized quasi-three dimensional analysis and experimental verification of an analysis performed for laminates with Teflon inserted on interfaces to simulate initial free-edge delamination. We performed tensile tests for laminates [30 2 / -30 2/90J 5 carbon-epoxy laminates with free-edge delamination under uniaxial tension. The experiment reveals that extensional stiffness of the laminate decreases by the initiation of the delamination, and that strength of the laminate without delamination is smaller than that of the laminates with delamination. Generalized quasi -three dimensional finite element technique, which employs energy release rate and maximum stress criteria, is developed to estimate behavior of the laminate after initial delamination. The numerical result by use of this technique predicts the ultimate strength of the laminates with sufficient accuracy according as the comparison with an experimental stress-strain curve. In the experiment conducted both for the laminate with initial delamination and the laminate without initial delamination, an unexpected results were obtained that is the ultimate load of the laminate without initial delamination was lower than that of the laminate with initial delamination. We presented clear explanation on the phenomenon occurred and developed the method to predict the nonlinear behavior of the laminate with or without initial delamination.

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Interlaminar Stresses in Composite Laminates Under Uniform Axial Extension

Cited by 947 publications

References 6 publications

The role of delamination in failure of fibre-reinforced composites

The role of delamination in failure of fibre-reinforced composites

Natural Vibrations of Laminated Composite Beams by Using Mixed Finite Element Modelling

Ultimate strength of composite laminates with free-edge delamination

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