Search results for " Mode II"
showing 4 items of 4 documents
A nonlinear finite element approach with cohesive-frictional interfaces for mode II Transverse Crak Tension test insight
2016
In many circumstances structural failure modes are driven by the formation and propagation of fractures. For instance in composite laminate structures one of the most worrying condition is delamination, which is an interlaminar progressive fracture. Fracture toughness is the material mechanical parameters which ensure fracture safe condition and it is also an essential parameter for performing nonlinear structural analysis, no matter if based on Fracture Mechanics or by means of Interface Cohesive theories. It is then of paramount relevance to evaluate the critical fracture energy by means of simple and reliable laboratory tests. Several tests are available for the direct determination of m…
Frictional effect in mode II delamination: Experimental test and numerical simulation
2013
Abstract The present paper proposes an experimental and a numerical analysis of the frictional effect on the mode II delamination. Frictional stresses between the crack edges can absorb and dissipate significant energy contributions in the delamination zones, especially under cyclic loading conditions. The experimental tests are performed for a set of unidirectional End-Notched Flexure (ENF) composite specimens, which are subjected to fatigue loading law with increasing mean value. The numerical analyses are performed considering a cohesive–frictional constitutive model, which is able to reproduce the transition of the interface behavior from the sound elastic condition to the fully cracked…
The effect of the through-the-thickness compressive stress on mode II interlaminar fracture toughness
2017
The effect of through-the-thickness compressive stress on the mode II interlaminar fracture toughness is investigated experimentally and replicated numerically. The modified Transverse Crack Tensile specimen recently proposed by the authors is used, together with an experimental device designed to apply a constant transverse compressive stress on the surface of the specimen. Experiments are conducted using IM7/8552 specimens for different compressive stresses, ranging from 0 to 100 MPa, covering all the practical applications commonly encountered in the aeronautical industry (e.g., tightened filled holes or bolted joints). It is shown that the mode II interlaminar fracture toughness increas…
Test de délaminage de composites en mode III pur du type ERCT
2017
International audience; Les matériaux composites sont de plus en plus utilisés dans le domaine des transports. Ils permettent de réaliser des structures légères économes en carburant. La connaissance approfondie de leur comportement mécanique est essentielle pour assurer un dimensionnement des structures optimisé. Les travaux présentés ici concernent le délaminage des composites, c’est un mode d’endommagement très fréquent de ces matériaux. En mécanique de la rupture, on distingue trois mode de sollicitation, le mode I d'ouverture de la fissure, le mode II de glissement perpendiculaire au fond de fissure et le mode III de glissement parallèle au fond de fissure. De nombreux travaux de reche…