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Application of bridging-law concepts to short-fibre composites - Part 1: DCB test procedures for bridging law and fracture energy
2000 (English)In: Composites Science And Technology, ISSN 0266-3538, Vol. 60, no 6, 871-883 p.Article in journal (Refereed) Published
Abstract [en]

This is the first paper in a series of four where notch sensitivities, fracture energies and bridging laws of short-fibre polymer composites are investigated. In the context of crack-bridging, the bridging law is an important material parameter. The bridging law can be used in combination with a stress analysis to address failure problems, for instance large-scale bridging, where linear elastic fracture mechanics is not valid. The bridging law of the material is sensitive to material composition and fibre architecture. Owing to the lack of established procedures, it is of interest to develop experimental and analytical methods for determination of the bridging law and fracture energy of short-fibre polymer composites. A method based on a large DCB specimen loaded by pure bending moments is used. Commercial GMT and SMC materials are investigated in addition to chopped-strand-mat laminates based on glass fibres of two different lengths and two thermoset matrices of different ductility. Fracture energies and bridging law data are successfully determined. All materials demonstrate softening bridging laws and this is discussed on the basis of observed mechanisms of failure and existing micromechanical models.

Place, publisher, year, edition, pages
2000. Vol. 60, no 6, 871-883 p.
Keyword [en]
polymer-matrix composites (PMCs), short-fibre composites, fracture toughness, fibre bridging, brittle matrix composites, cementitious composites, fiber composites, toughness
URN: urn:nbn:se:kth:diva-19743ISI: 000086967100008OAI: diva2:338435
QC 20100525Available from: 2010-08-10 Created: 2010-08-10Bibliographically approved

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Berglund, Lars A.
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