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Micromechanical model of cross-over fibre bridging - Prediction of mixed mode bridging laws
KTH, School of Engineering Sciences (SCI), Solid Mechanics (Dept.).
2008 (English)In: Mechanics of materials (Print), ISSN 0167-6636, Vol. 40, no 4-5, 220-234 p.Article in journal (Refereed) Published
Abstract [en]

The fracture resistance of fibre composites can be greatly enhanced by crack bridging. In situ observations of mixed mode crack growth in a unidirectional carbon-fibre/epoxy composite reveal crack bridging by single fibres and by beam-like ligaments consisting of several fibres. Based on the observed bridging mechanism, a micromechanical model is developed for the prediction of macroscopic mixed mode bridging laws (stress-opening laws). The model predicts a high normal stress for very small openings, decreasing rapidly with increasing normal and tangential crack opening displacements. In contrast, the shear stress increases rapidly, approaching a constant value with increasing normal and tangential openings. The solutions for the bridging laws and the resulting toughening due to the bridging stresses are obtained in closed analytical form.

Place, publisher, year, edition, pages
2008. Vol. 40, no 4-5, 220-234 p.
Keyword [en]
fracture resistance, ESEM testing, polymer-matrix composites, potential, function, ceramic-matrix composites, crack-growth, r-curves, reinforced, composites, interlaminar fracture, cohesive laws, delamination, toughness, resistance, interface
URN: urn:nbn:se:kth:diva-17278DOI: 10.1016/j.mechmat.2007.07.007ISI: 000252579900006ScopusID: 2-s2.0-37349098153OAI: diva2:335321
QC 20100525Available from: 2010-08-05 Created: 2010-08-05Bibliographically approved

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Gamstedt, E. Kristofer
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