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Stress spectra and the effective elastic and viscoelastic properties of unidirectional composites under transverse loading
KTH, School of Engineering Sciences (SCI), Aeronautical and Vehicle Engineering, Lightweight Structures.
2000 (English)In: Journal of composite materials, ISSN 0021-9983, E-ISSN 1530-793X, Vol. 34, no 17, 1418-1436 p.Article in journal (Refereed) Published
Abstract [en]

The relationship between the statistical characteristics of the microstructure, the stress state in the matrix and the effective properties of unidirectional composites have been studied. A representation of the stress state in the form of stress spectra is introduced. The skewness of spectra derived for the four basic regular periodic fiber arrays reflects the degree of order in the microstructure. A hybrid array combining features of these arrays was developed to approximate a random array. All stress components in the matrix of such a pseudo-random composite under transverse load exhibit an approximately Gaussian distribution. The stress state in the matrix determines the effective elastic modulus and the viscoelastic relaxation strength. This has led to a stress-based mechanical analysis using the moments of the stress spectrum for a representative, pseudo-random fiber arrangement.

Place, publisher, year, edition, pages
2000. Vol. 34, no 17, 1418-1436 p.
Keyword [en]
Elastic moduli, Matrix algebra, Probability distributions, Statistical methods, Stress analysis, Viscoelasticity, Pseudo-random fiber array, Unidirectional composites, Composite micromechanics
National Category
Applied Mechanics
URN: urn:nbn:se:kth:diva-80045DOI: 10.1106/83C4-BMUJ-MNRQ-77XAOAI: diva2:495997

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Available from: 2012-02-09 Created: 2012-02-09 Last updated: 2016-05-27Bibliographically approved

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