Compressive fracture in undirectional glass-reinforced plastics

Chaplin, C. R.

doi:10.1007/bf00566277

Cited by 107 publications

(30 citation statements)

References 2 publications

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“…The compressive strength of these oriented polymers is usually defined as the stress which initiates the apparent yield behavior and concommitant kink banding. These compressive characteristics are not unique to oriented polymers, having been observed for other materials exhibiting similar structural anisotropy such as wood [16,17], unidirectionally reinforced fiber composites [18][19][20][21][22], graphite fibers [23,24] and models of foliated rock [25].…”

Section: Introductionmentioning

confidence: 87%

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A model for the compressive buckling of extended chain polymers

1985

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Section: Introductionmentioning

confidence: 87%

“…It has been shown that kink bands are nucleated in a localized area at a certain critical stress and then propagate at nearly constant compressive loads [19,25]. The presence of voids in the fibers eliminates the elastic foundation on one side for those chains which line the void surface.…”

Section: In Comparing Measured and Predicted Values Of Compressive Stmentioning

confidence: 99%

A model for the compressive buckling of extended chain polymers

1985

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“…1b. Eventually, the matrix strain hardens suciently within the band for the material to`lock-up' and continued end shortening of the structure is due to broadening of the band in the axial direction at a constant value of remote stress s b , point D. It is found experimentally that the locked-up state within the band is associated with a state of zero volumetric strain within the band: as the ®bres rotate they ®rst lead to dilation within the band, followed by compaction until lock-up occurs at fI2b (Chaplin (1977), Evans and Adler (1978) and Sivashanker et al (1996)). The response for a perfect composite, " f 0, is included in Fig.…”

Section: Introductionmentioning

confidence: 97%

Microbuckle tunnelling in fibre composites

Fleck

Zhao

2000

Journal of the Mechanics and Physics of Solids

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The propagation of compressive failure in multi-directional composite laminates is modelled by the tunnelling of a microbuckle within the load-bearing axial plies, with concomitant delamination of the neighbouring o-axis plies. The microbuckle tunnels at its tip in a crack-like mode III manner, and the steady state tunnelling stress is estimated by calculating the energy dierence between the upstream unbuckled state and the downstream buckled state. The downstream state is analysed in detail using a plane strain analysis of a microbuckle with delaminations from its tips. In the downstream 2D problem, microbuckling of the axial plies is represented by the generation of an inclined mode II crack, with an associated microbuckling tip toughness and a constant sliding stress across its¯anks. The delaminations at the interface between the axial and adjacent o-axis plies are idealised as traction-free mixed-mode interfacial cracks. Predictions of the steady-state tunnelling stress are obtained for an isotropic solid by solving an integral equation and by the ®nite element method; ®nite element techniques are then used to solve the tunnelling problem for an orthotropic solid and for a cross-ply laminate. For each case, the tunnelling stress and the delamination crack length are obtained as functions of the ratio of delamination to microbuckle toughness, and of the inclination of the microbuckle band. The tunnelling stress provides a useful lower bound for the compressive strength of a thick laminated structure. 7

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“…The (0001) for HCP Cadmium is the basal plane. The advent of fibrous materials has rekindled interest in the subject, and in recent years, fiber kinking as a viable mode of failure has been observed by, among others, Weaver and Williams (1975), as well as other researchers (Dale and Baer, 1974;Robinson et al, 1986, Evans andAdler, 1983;Chaplin, 1977). Judging from the experimental evidence available, it appears that the formation of compression-induced kink bands is closely associated with the existence of a preferable glide plane in the direction of compression.…”

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confidence: 97%

A Mechanical Model for Elastic Fiber Microbuckling

Waas

Babcock

Knauss

1990

Journal of Applied Mechanics

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I Fiber Microbuc kling' A two-dimensional mechanicai model is presented to predict the compressive strength of unidirectional fiber composites using technical beam theory and classical elasticity. First, a single fiber resting on a matrix half-plane is considered. Next, a more elaborate analysis of a uniformly laminated, unidirectional fiber composite halfplane is presented. The model configuration incorporates a free edge which introduces a buckling mode that originates at the free edge and decays into the interior of the half-plane. It is demonstrated that for composites of low volume fraction ( A problem that has received much attention but moderate success is the prediction of compressive strength of fiber composites. Dow and Gruntfest (1960) were apparently the first to identify fiber buckling as a viable mode of compressive failure in composites. Their work was followed by that of Fried and Kaminetsky (1964) and Leventz (1964), who addressed. experimentally and theoretically the question of compressive strength. In these investigations, an empirical factor was used to o b t d~ a ccrrda:im between the experimentally and theoretically predicted values of compressive strength. In 1965, Rosen (1965) presented an analysis addressing the question of microbuckling which was devoid of any empiricism and laid the foundation for much of the work that was to follow. With a few exceptions, noted later, the analytical research work carried out in the past 20 years is based on the model by Rosen (1965). Due to lack of space and because an excpllent literature survey on fiber microbuckling exists @quart (1985)), a discussion of the various contributions that have enhanced our understanding of microbuckling will be omitted here. Instead, the discussion will be limited to those aspects that are fundamental in clarifying the state-of-the-art of the subject. The interested reader is referred to the references at the end of this chapter and the review by Shuart (1985). in particular, for a complete and up-to-date account.The Rosen (1965) model for microbuckling addresses the problem of fiber buckling in glass fiber/epoxy laminates

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Compressive fracture in undirectional glass-reinforced plastics

Cited by 107 publications

References 2 publications

A model for the compressive buckling of extended chain polymers

A model for the compressive buckling of extended chain polymers

Microbuckle tunnelling in fibre composites

A Mechanical Model for Elastic Fiber Microbuckling

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