Frederique Trivaudey

Frederique Trivaudey
Institut FEMTO-ST | FEMTO ST · Department of Applied Mechanics

About

44
Publications
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476
Citations

Publications

Publications (44)
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
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...
Article
In this paper, a novel method for damage prediction and dynamic behaviour analysis of laminate composite structures is proposed and investigated. The dynamic behaviour of transversely isotropic layers is expressed through elasticity coupled with damage using a phenomenological macro-model for cracked composite structures made of polymer reinforced...
Article
Novel high-temperature thermoplastic polymers offer potential advantages over thermoset ones and represent a promising alternative in advanced composite applications. This work proposes to determine the thermal properties and resistance of unidirectional carbon fibre reinforced thermoplastic polyimide composite and to characterize the influence of...
Conference Paper
Full-text available
Damage affects negatively the safety of the structure and can lead to failure. Thus, it is recommended to use structural health monitoring techniques in order to detect, localize and quantify damage. The main aim of the current work is the development of a numerical metamodel to investigate the dynamic behavior of damaged composite structures. Henc...
Conference Paper
Full-text available
This study proposes to investigate the influence of the 3D morphology of plant fibres on their tensile behaviour. A numerical approach is proposed. An isotropic viscoelastic constitutive law in a material rotating frame is used to model the behaviour of the fibre wall. Different simplified geometries are simulated using FE Abaqus® software. Results...
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...
Conference Paper
Full-text available
The aim of this study is the prediction of the dynamic response of damaged laminated composite structures in the context of component mode synthesis. Hence, a method of damage localization of complex structures is proposed. The dynamic behavior of transversely isotropic layers is expressed through elasticity coupled with damage based on an existing...
Conference Paper
Full-text available
In this work, a macro modeling is proposed to predict the dynamic response of damaged laminatesmade of unidirectional orthotropic layers of a polymer matrix reinforced with long fibers. The dynamic behavior of the composite structure is expressed through elasticity coupled with damage based on phenomenological approach for cracked structures. The s...
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
From a Finite Element analysis, the stress distribution in the notch of axisymmetric and highly loaded notched samples has been calculated. The samples are shaped like a thread root. We propose a simplified method of sizing screws for a large range of mean stresses. So, a local Haigh's diagramm at the thread root is built from the Haigh's diagram d...
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...
Conference Paper
On présente une synthèse de travaux destinée au développement d'un outil de dimensionnement des structures composites stratifiées. La construction de cet outil repose sur un ensemble de quatre grands éléments : une modélisation au niveau du pli élémentaire, une modélisa tion permettant le calcul de la structure, l'identification des paramètres et e...
Article
A meso–macro modelling is proposed for laminates made of unidirectional layers of a polymer matrix reinforced with long fibres. The time-independent behaviour introduced in the first part of this article is improved herein to account for viscous phenomena through viscoelasticity and viscoplasticity. A spectrum-type viscoelastic model is considered,...
Article
A meso–macro modelling is proposed for laminates made of unidirectional layers of a polymer matrix reinforced with long fibres. The behaviour of a layer is expressed through elasticity coupled to damage and plasticity. The anisotropic damage is completely described by a single scalar variable and its evolution law is specified from the principle of...
Article
Designers often want to analyze more and more sophisticated structures, thus leading to very large finite element models (typically 10 00 000 degrees of freedom for a body car, for example). These models being too costly for the early stages of design and optimization can be reduced by a substructure analysis or a mesh simplification of the compone...
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
The possibilities provided by the rule of mixtures are well-known as regards the calculation of the longitudinal modulus and the Poisson's ratio of a unidirectional composite material. Its limits for determining the transverse and shear moduli are also known. The aim of this study is to demonstrate that the transverse and isotropic moduli of an agg...
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...

Questions

Question (1)
Question
I use an appropriate Abaqus Shell element (S3R, S4 or S4R) to model a sample in flexion test. Geometric linear calculations are very good. But as soon as   NLGEOM is switched from  "no" to "yes" convergence is no longer achieved and calculations stopp right away although these elements seem to be suitable for such calculations. All rigid body motions are suppressed. Used material is simply elastic. Do I have to add something because I can't see anything in the documentation. I don't understand why calculations stop

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