Développement d'une interface intralaminaire pour une approche Semi-Continue : application à l'impact sur stratifié UD

Abstract : This article deals with unidirectional composite modelisation (thick UD) undergoing a low velocity impact. Impact on composite structures is the most common and penalizing source of damage. Indeed, the weakness of composite materials make them more vulnerable to this kind of sollicitation (matrix cracks, fibers breaks, delaminations). The modelisation of woven and UD laminates response under impact loading was the subject of many studies. Particularely, [1, 2, 3, 4] decribe an approach called Semi-continuous modelisation, which consists to represent the fiber stands by rod elements, stabilized by 2D specific damageable elements.Then, the laminate is built by using a specific interface element able to take the rotation degrees of freedom into account between two shell elements. This strategy allows to have an accurate representation of local damages induced by a low or middle velocity impact on thin woven or UD laminates.In this summarized work, an extension of this model to a modelisation of thicker UD laminates is realised. The proposed modelisation is inspired by experimental observations : the intralaminar matrix cracks caused by the out-of-plane shear loading drive the initiation and the propagation of delaminations. Thus, in order to catch this damage scenario, an intrala-minar interface element was developed. This element follows a bilinear cohesive law. It is built to be interspersed between each UD element.
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Ldjoudi Manseri, Pablo Navarro, Olivier Dorival, Steven Marguet, Bassam Mahmoud, et al.. Développement d'une interface intralaminaire pour une approche Semi-Continue : application à l'impact sur stratifié UD. 21ème Journées Nationales sur les Composites, École Nationale Supérieure d'Arts et Métiers (ENSAM) - Bordeaux, Jul 2019, Bordeaux, Talence, France. ⟨hal-02420753⟩

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