Fracture and fatigue performance of textile commingled yarn composites

Gilchrist, Michael D.; Svensson, Staffan; Shishoo, Roshan

doi:10.1023/a:1004431104540

Cited by 24 publications

(17 citation statements)

References 24 publications

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“…However, the inter-laminar stresses within laminated materials are localised at interfaces due to the strong discreteness in the material properties. This localisation of stress can lead to delamination and crack propagation [4][5][6]. To eliminate the stress localisation, a proper continuous gradient is required to smooth the property transition 3 through the thickness.…”

Section: Introductionmentioning

confidence: 99%

“…They showed that, for a particular density, a foam is most efficient at absorbing the kinetic energy of an impact over a limited range of 5 stress, after which the stress rises rapidly with little corresponding increase in absorbed energy. By means of a functionally graded foam, it may be possible to combine a large range of densities to improve the energy absorbing efficiency over a wider range of stress levels.…”

Section: Introductionmentioning

confidence: 99%

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Designing the energy absorption capacity of functionally graded foam materials

Cui

Kiernan

Gilchrist

2009

Materials Science and Engineering: A

291

107

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In this paper, a functionally graded foam model is proposed in order to improve upon the energy absorption characteristics offered by uniform foams. In this novel model, the characteristics of the foam (e.g. density) are varied through the thickness according to various gradient functions. The energy absorption ability of the novel foam is explored by performing finite element simulations of physical impact tests on flat specimens of the functionally graded foam materials. Energy absorbing capacity w.r.t. parameters including gradient functions, density difference, average density, and impact energy, is explored in detail. It is illustrated that the functionally graded foam is superior in energy absorption to the uniform foam and that convex gradients perform better than concave gradients. The performance of such foams can be improved more if the density difference is enlarged. These findings provide valuable suggestions in the design of high performance energy absorption polymeric foams.

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Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Designing the energy absorption capacity of functionally graded foam materials

Cui

Kiernan

Gilchrist

2009

Materials Science and Engineering: A

291

107

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“…Compared to traditional thermoset matrix composites the crack initiation and propagation toughness is higher for these materials. Models for predicting mixed mode delamination in prepreg and textile composites have been developed by the author and are discussed in detail elsewhere [5,6].…”

Section: Mechanical Propertiesmentioning

confidence: 99%

“…For this reason, the woven laminates were also subjected to flexural fatigue loading [5]. A decrease in failure load to about 60% of the maximum static flexural strength was observed after 10 6 load cycles.…”

Section: Mechanical Propertiesmentioning

confidence: 99%

Modelling of failure of structural textile composites

Svensson¹,

Gilchrist

2000

Computational Mechanics

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Publication informationComputational ABSTRACTThis paper summarizes extensive experimental work regarding the manufacture, mechanical characterization and modelling of textile thermoplastic composites produced by means of commingled yarns. These composites are believed to have a high potential for applications in structural automotive components. However, methods need to be developed for faster manufacturing and reliable prediction of the component mechanical performance and failure. A practical approach of finite element modelling of the stiffness and strength behaviour of these composites is briefly discussed. IntroductionThe continued successful usage of composite materials requires not only good mechanical performance but also fast manufacturing procedures. Glass Mat Thermoplastic (GMT) materials have proven their worth in large volume components in the automotive industry but their random fiber distribution and relatively low fiber volume fraction have limited the use to semi-structural applications. However, with the vast technology available in the textile industry there is much potential to accelerate the production process and to expand the range of mechanical properties and thus to develop new structural applications for composite materials.The use of advanced textile preforms puts new demands on the models and procedures that are used for predicting component performance such as, for example, finite element analysis (FEA). New, and more accurate, material models, failure criteria and analysis procedures are required for an optimal design of composites components. This is

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“…[1,2] The big advantage of graded foams is the improved mechanical stability of the material under low energy impact, while still performing nearly as well as their uniform counterpart under high energy conditions. [19][20][21] One possibility to generate a density gradient without lamination is reaction injection molding. Other potential applications for functionally graded foams are interfacial tissue engineering, [7][8][9] especially for bone implants, [10][11][12] (micro) filtration, [13][14][15] as well as construction.…”

mentioning

confidence: 99%