Validation of a novel model for the compressive response of FRP: experiments with different fibre orientations
Paper in proceeding, 2017

Crush tests have been performed on flat unidirectional non-crimp fabric (NCF) coupons with different fibre orientations as part of the validation of a ply-based damage model for crash. The fibre off-axis angle with respect to the crushing direction ranged from 0º to 90°. The results of the tests indicate that the crush stress remains unchanged for off-axis angles between 0° and 15°. The failure mode in these specimens was out-of-plane kinking. For 20° and 25° off-axis angles the crush stress dropped 20% and evidence of out-of-plane kinking were harder to find. For 45° off-axis angle a network of matrix cracks develops in the specimen and for 90° off-axis angle a brittle shear failure is observed. It is suggested that the out-of-plane kinking is promoted because of the natural waviness of NCF materials and that the high in-plane shear stress generated from 20-25° off-axis loading results in a transition from out-of-plane kinking to in-plane kinking. These hypotheses need, however, to be verified by an extended failure analysis of the crush specimens.

Non-crimp fabric

Fibre kinking


Mechanical testing



Thomas Bru

Chalmers, Applied Mechanics, Material and Computational Mechanics


Robin Olsson

Chalmers, Applied Mechanics, Material and Computational Mechanics

Gaurav Vyas


Sergio Costa


Chalmers, Applied Mechanics, Material and Computational Mechanics

ICCM International Conferences on Composite Materials

Vol. 2017

21st International Conference on Composite Materials ICCM-21
Xi’an, China,

Subject Categories

Applied Mechanics

Other Materials Engineering

Composite Science and Engineering

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