Classification and quantification of initial porosity in a CMC laminate

Puglia, P Del; Sheikh, M. A.; Hayhurst, D. R.

doi:10.1016/j.compositesa.2003.09.026

Cited by 67 publications

(68 citation statements)

References 6 publications

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“…Manufacturing defects, particularly voids are among the most common manufacturing induced defects in composites [1,2]. In polymeric composite materials, voids always have detrimental effects on the mechanical properties [3][4][5].…”

Section: Introductionmentioning

confidence: 99%

Qualitative separation of the effect of voids on the static mechanical properties of hygrothermally conditioned carbon/epoxy composites

Zhang¹,

Li²,

Zhang³

et al. 2011

Express Polym. Lett.

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Abstract. The paper investigates the effect of voids and hygrothermal conditions on bending, compressive, and interlaminar shear strength (ILSS) of T300/914 composite laminates. By adopting different autoclave pressures during a cure cycle, specimens with three different void contents ranging from 0.33% to 1.50% were obtained. Experimental results reveal that compressive, bending strength, and ILSS decrease with increasing void contents and immersion time. The most significant decrease in strength of aged specimens is in the ILSS and compressive strength, followed by the bending strength. The effect of voids on the absorption/desorption behavior is also discussed. For a similar porosity, the compressive strength and ILSS of dried specimens are higher than that of the aged specimens, while they are lower than that of the unaged specimens. The bending strength of the dried specimens is higher than that of the unaged specimens. The experimental results are explained by the supportive micrographs that illustrate different types of voids and their morphology before and after moisture absorption/desorption.

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Section: Introductionmentioning

confidence: 99%

Qualitative separation of the effect of voids on the static mechanical properties of hygrothermally conditioned carbon/epoxy composites

Zhang¹,

Li²,

Zhang³

et al. 2011

Express Polym. Lett.

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“…The high specific strength, stiffness, and good chemical resistance of carbon fiber reinforced polymer matrix composites (CFRP) make them attractive for applications from sports equipment to aerospace structures [1][2][3][4]. However, CFRP laminates are relatively brittle under the impact loading, which limit its wide applications [5][6][7].…”

Section: Introductionmentioning

confidence: 99%

The Impact Damage and Medium Leakage of CFRP Laminates with Different Thickness

Zhang¹,

Zhang²,

Qu³

et al. 2015

Proceedings of the 2015 International Symposium on Material, Energy and Environment Engineering

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Abstract. The effects of thickness and impact energy on the impact damage and the medium leakage of CFRP laminates were studied in this paper. Impact tests for the CFRP laminates with the size of 600 mm×700 mm with five different thicknesses were subjected to the impact energy levels from 5 J to 65 J. The matrix length was investigated according to different energy levels and different thicknesses. The experimental results reveal that the crack length increases linearly with the increasing impact energy. For the same impact energy, the crack lengths decrease with the increasing specimen thickness. The impact energy initial value of medium leakage increases with the increasing thickness. The impact energy initial value of aviation kerosene leakage is about 6.7416 times of the thicknesses of laminates, which is coordinate with the experience value of 6.75 times.

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“…However, initial manufacturing porosity was not modelled. Del Puglia et al (2004aPuglia et al ( , 2004bPuglia et al ( , 2005 later overcame this deficiency with the inclusion of porosity at the macro-unit cell level for the same (DLR-XT) material.…”

Section: Introductionmentioning

confidence: 99%

Effects of in-plane extension on transverse thermal conductivity of a carbon–carbon 8-harness satin weave composite

Zhang

Hayhurst

2016

International Journal of Damage Mechanics

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A finite element-based technique for coupled thermo-mechanical analysis of woven Ceramic MatrixComposites sheets is presented for the prediction of the degradation of transverse thermal transport behaviour with in-plane extension. The thermal conductivity-strain characteristics have been determined, at the tow level, from the properties of the constituent elements, and then extended to tows and composite. The non-linear thermal conductivity-extension behaviour of the tow has been discretised by multi-linear curves, and implemented in a user-defined subroutine in ABAQUS to model the behaviour of the homogenised orthotropic unidirectional tow and its matrix. By using this approach, an 8-Harness Satin weave HITCO C/C composite unit cell has then been analysed. The variation of through-thickness thermal conductivity degradation with in-plane extension has been predicted and compared with the results of experiments. Very good agreement has been achieved. Two classes of behaviour have been experimentally observed: one that exhibits a brittle response, and another that shows a quasi-ductile behaviour. Both classes of behaviour have been predicted and shown to relate, respectively, to strain localisation and instantaneous pull-out deactivation, without localisation being invoked. These responses are reflected directly in the predicted and experimental rates of decay of transverse thermal conductivity with axial extension. It is advocated that the reduction in transverse thermal conductivity with extension and damage can be used as a Structural Integrity Monitor for CMC operational components.

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Classification and quantification of initial porosity in a CMC laminate

Cited by 67 publications

References 6 publications

Qualitative separation of the effect of voids on the static mechanical properties of hygrothermally conditioned carbon/epoxy composites

Qualitative separation of the effect of voids on the static mechanical properties of hygrothermally conditioned carbon/epoxy composites

The Impact Damage and Medium Leakage of CFRP Laminates with Different Thickness

Effects of in-plane extension on transverse thermal conductivity of a carbon–carbon 8-harness satin weave composite

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