Violaine Guicheret-Retel

Violaine Guicheret-Retel
Institut FEMTO-ST | FEMTO ST · Department of Applied Mechanics

About

31
Publications
3,170
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361
Citations

Publications

Publications (31)
Article
This work describes a new class of sandwich panels made of hemp fibre composites and eco-friendly core materials (balsa, paper honeycomb and recycled polyethylene terephthalate foam). The biobased panels are designed to replace analogous glass fibre mat solutions widespread in the automotive sector. Compared to their fossil benchmarks, these panels...
Article
Various papers in the open source literature have shown that the tensile properties of plant fibres are very scattered. To date, this difference has been viewed as an obstacle to the use of biobased composites in structural applications. However, this question of dispersion has yet not been extensively addressed at the composite scale. Therefore, t...
Article
Transverse compression tests are the established way to identify the transverse mechanical properties of single fibers. However, to the authors knowledge, the influence of an angle between the two compression platens has never been studied or quantified. In this paper, the importance of platen parallelism is studied for the first time through: nume...
Article
The development of sustainable sandwich materials is needed in the transportation sector to address environmental concerns related to the production and operation of vehicles. In addition to biobased composite skins, alternatives to classic synthetic core materials must be found to reduce the ecological footprint of whole sandwich-structured compos...
Article
Full-text available
This paper investigates the influence of the stress level and hygrothermal conditions on the creep/recovery behaviour of three high-grade composites made of GreenPoxy and flax and hemp fibres. The results show that the levels of instantaneous, time-delayed and residual strains increase with the applied load and the severity of the environment. The...
Conference Paper
Full-text available
Pour réduire leur empreinte environnementale, les industriels recherchent des matériaux renouvelables pouvant se substituer aux solutions pétrosourcées. De par leur faible densité et leurs propriétés mécaniques élevées, l'intérêt pour les matériaux composites à fibres végétales se fait grandissant. Cependant, le manque de données concernant le comp...
Article
Despite the great similarities in the physical and chemical properties of flax and primary hemp fibres, literature generally reports differences in their average tensile properties. This work proposes a numerical investigation of the relationships between the morphological, biochemical and cell wall features, along with their variability, and the m...
Poster
Full-text available
La recherche de matériaux ayant une empreinte écologique plus faible et pouvant être utilisés dans des applications structurales fait grandir l’intérêt des industriels envers les composites à fibres végétales. Ces nouveaux matériaux représentent une alternative aux solutions pétrosourcées. Les composites à structures sandwiches, permettant d’allier...
Article
Full-text available
This study presents a new strategy for the identification of material parameters in the case of restricted or redundant data, based on a hybrid approach combining a genetic algorithm and the Levenberg-Marquardt method. The proposed methodology consists essentially in a statistically based topological analysis of the search domain, after this one ha...
Article
Full-text available
Experimental observations have shown that most of plant fibres are characterised by an intricate structure, morphology and organisation. This complex geometrical characteristics may affect the mechanical behaviour of this kind of natural fibres and contribute to the high variability of their mechanical properties. So, this study proposes a numerica...
Conference Paper
Full-text available
Natural fibres derived from annual plants are attractive candidates to reinforce organic matrix in high performance composite applications. This use requires an accurate understanding of their mechanical properties and the development of efficient models. In the last years, many efforts were focused on the characterisation of the tensile properties...
Article
Full-text available
This work investigates the tensile creep behaviour of single hemp fibres under constant and cyclic loading coupled to constant or variable moisture content environment. Results show that the primary creep strain rate of such fibres decreases with the increasing stress, while the secondary creep strain rate increases. Load cycling at an average load...
Article
Full-text available
The literature on the time-dependent behaviour of single bast fibres such as flax and hemp is extremely poor. The aim of this extensive study is to characterise the long-term behaviour of elementary hemp fibres and to establish suitable constitutive laws. Single hemp fibres are shown to exhibit both instantaneous strain and delayed, time-dependent...
Article
A 3D viscoelastic model is presented, based on the use of finite element method for the study of the nonlinear tensile behaviour of hemp fibres. On the basis of an experimental investigation, Part I of this study (Placet et al., 2014) proposed a scenario based on several physical mechanisms, in order to explain the nonlinear behaviour of such fibre...
Conference Paper
Full-text available
In view of the production of high performance composites reinforced with plant-based fibres, it is essential to account for the high variability and the dependence of the fibre’s mechanical properties to moisture conditions in the design tools and models. This study proposes several empirical formula with probability distribution functions determin...
Article
The aim of this paper is to investigate the origin of the diameter-dependence of Young’s modulus in hemp fibres. In view of the considerable experimental difficulties encountered when determining the 3D morphology of elementary fibres, the influence of the fibre morphology and size on the E-modulus is studied using a mathematical model. An approach...
Article
Full-text available
This paper presents a unilateral damage model coupled with an orthotropic elastic behaviour, to analyse the cracks closure/opening effect on the behaviour of a plate made of long fibre reinforced polymer matrix. The cracks are supposed to grow along the fibres direction with different opening ways. According to the sign of the stress normal to the...
Article
Transdermal drug delivery is a novel alternative painless way to inject medicine and therapic agents through skin. Our study investigates an array of out-of-plane microneedles to pierce the permeability barrier without reaching the nerves in the deeper layers. To the best of our knowledge, the skin behavior during the insertion of a microneedle arr...
Article
During first rise to power in Power Water Reactor, fuel pellets crack because of thermal expansion. The phenomena of pellet cracking and fragments relocation have a major influence on rod behaviour and especially on the cladding behaviour in the case of pellet–cladding interaction.This article presents the modeling used to take into account the fra...
Article
In the water pressurised nuclear reactors, the fuel rod cladding is the first barrier against radioactive isotopes release. Its integrity must be demonstrated all along the fuel rod irradiation with increasing strenuous operating conditions. This paper deals with a study made with Electricité de France (EDF) in order to improve the understanding an...
Article
Some computer codes are developed to solve specific industrial problems. For economical reasons, and especially when they are used for parametrical studies, these codes have to be not too time-consumer. However, industrial problems are often complex, involving 3D effects when 3D modelling is often not practicable. So 2D or even 1D modelling have to...
Article
A problem commonly encountered in plastic and reconstructive surgery is the prediction of the stress put on the skin when various types of skin flaps are used. We developed a mathematical model based on the finite element method, in order to determine the stress field, by simulating the mechanical behaviour of human skin during wound closure. We ch...
Article
Full-text available
This paper presents a unilateral damage model coupled with an orthotropic elastic behaviour, to analyse the closure/opening effect on the behaviour of a representative elementary volume. Indeed, the oriented nature of the cracks along the fibres and the unilateral contact of the cracks lips (according to the opening or closure of cracks) lead to co...

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