Experimental characterisation of macro-crack propagation in 3D woven composites, size effect and associated damage gradient models

Propagation de macro-fissures dans les composites tissés 3D, effet d'échelle et modèles à gradeint associés

Victor Médeau (1, 2, 3) , Frédéric Laurin (1) , Johann Rannou (1) , Antoine Hurmane (1) , S Mousillat (2) , Frederic Lachaud (3)

1 DMAS, ONERA, Université Paris Saclay [Châtillon]
2 Safran Aircraft Engines
3 ICA - Institut Clément Ader

The critical energy release rate was identified on 3D woven carbon/epoxy composites, using CT and SENB specimens. The analysis relied on multiple instrumentation methods to monitor the crack growth and compared several methods for the crack detection and estimation in order to obtain a robust process. Variation of with the specimen size and shape was highlighted. A non-linear framework was then proposed to describe fracture propagation in the material, relying on the existence of an internal length. The use of at least two material parameters , an asymptotic fracture release rate, and , a characteristic internal length, is necessary to completely describes the variation of the apparent with the specimen shape and scale. The use of non-linear models introducing internal lengths and controlling the dissipated energy is then investigated to transcribe the experimental results.

Mots clés: 3D woven composites; Energy realease rate; Size effect; Non-linear fracture

Mots clés: Effet d'échelle; Fissuration; Composite tissé 3D; Modèle à gradient

Domaines: Sciences de l'ingénieur [physics]; Physique [physics]; Chimie

Victor Médeau, Frédéric Laurin, Johann Rannou, Antoine Hurmane, S Mousillat, et al.. Experimental characterisation of macro-crack propagation in 3D woven composites, size effect and associated damage gradient models. ECCM18 – 18th European Conference on Composite Materials, Jun 2018, Athens, Greece. ⟨hal-03189106⟩