Validation of a novel model for the compressive response of FRP: experiments with different fibre orientations
Paper i 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, Tillämpad mekanik, Material- och beräkningsmekanik


Robin Olsson

Chalmers, Tillämpad mekanik, Material- och beräkningsmekanik

Gaurav Vyas


Sergio Costa


Chalmers, Tillämpad mekanik, Material- och beräkningsmekanik

ICCM International Conferences on Composite Materials

Vol. 2017

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


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