Kinking as a mode of structural degradation in carbon fiber composites

Evans, A.G.; Adler, William F.

doi:10.1016/0001-6160(78)90023-8

Cited by 170 publications

(42 citation statements)

References 8 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%

A model for the compressive buckling of extended chain polymers

1985

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Section: Introductionmentioning

confidence: 87%

A model for the compressive buckling of extended chain polymers

1985

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“…Adler [9], who used a thermodynamics and mechanics approach to analyze "kinking" or fiber bundle micro-buckling in carbon-carbon composites.…”

Section: Micromechanics Analysismentioning

confidence: 99%

Finite Element Micromechanics and Minimechanics Modeling of a Three- Dimensional Carbon-Carbon Composite Material

Walrath¹,

Adams²

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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Kinking as a mode of structural degradation in carbon fiber composites

Cited by 170 publications

References 8 publications

A model for the compressive buckling of extended chain polymers

A model for the compressive buckling of extended chain polymers

Finite Element Micromechanics and Minimechanics Modeling of a Three- Dimensional Carbon-Carbon Composite Material

Microbuckle tunnelling in fibre composites

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