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Author

Feras Alkatan

Bio: Feras Alkatan is an academic researcher from University of Toulouse. The author has contributed to research in topics: Bolted joint & Finite element method. The author has an hindex of 3, co-authored 6 publications receiving 94 citations. Previous affiliations of Feras Alkatan include Intelligence and National Security Alliance.

Papers
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Journal ArticleDOI
TL;DR: In this paper, the axial stiffness of a bolt is calculated based on the deformation energy of the bolt head, the engaged part, the nut and the fastened plates.

61 citations

Journal ArticleDOI
TL;DR: In this article, the effect of axial preload on the durability of aerospace fastened joints is investigated using a 3D finite element model and the analysis of its behavior confirms and explains experimental observations.

20 citations

Journal ArticleDOI
TL;DR: In this article, a simple analytical method was proposed to describe the behavior of a hybrid load transfer bolted joint assembly, that is working both with adhesion and plastic deformation-shearing.

17 citations

Journal ArticleDOI
TL;DR: In this article, the authors focus on the effect of pre-stressing and the coefficient of friction on the apparent flexibility of a hybrid load transfer fastener and propose a model for determination.

3 citations

Dissertation
14 Dec 2005
TL;DR: In this article, the stiffness of the components of the assembly according to all the parameters defining the design of the design is studied. But this work is based on a Finite Elements model validated by an experiment.
Abstract: Les travaux de cette these consistent a etudier les raideurs des elements constitutifs des assemblages en fonction de tous les parametres definissant la conception. Cette etude s’appuie sur une modelisation par Elements Finis validee par une experimentation. Elle permet d’en tirer des modeles de calcul permettant une determination precise et rapide de ces raideurs. Dans la premiere partie, on montre l’interet de calculer avec precision les raideurs equivalentes des pieces et des boulons pour le dimensionnement de l’assemblage, une meilleure maitrise du serrage a l’angle ou de la mise en precontrainte par tendeur hydraulique. La connaissance des raideurs est egalement necessaire pour creer des modeles E.F simplifies. L’etude critique complete et l’analyse des principales methodes de calcul des raideurs equivalentes qui ont ete proposees jusqu’ici, montrent des differences importantes entre les formulations proposees. D’ou la necessite de reprendre ces etudes avec les moyens modernes de simulation. Dans un deuxieme temps, nous nous interessons a la justification des methodes de determination proposees qui permettent de s’affranchir de la mesure des deplacements, principale source d’erreur constatee dans les travaux precedents. Les travaux realises pour determiner les raideurs des boulons et des pieces cylindriques en fonction des differents parametres sont alors presentes ainsi que les essais de vissage a l’angle permettant de valider les resultats de tres nombreuses simulations realisees. L’ensemble de ces travaux de simulations tres importants sont resumes sous forme d’une methode pratique de calcul qui permet la determination precise des raideurs des boulons et des pieces cylindriques dans toutes les situations. Dans une troisieme partie, pour completer l’etude, nous nous sommes interesses a des cas specifiques de l’assemblage comme celui des pieces prismatiques avec des trous excentres, et celui de l’empilage de deux pieces assemblees. Des solutions originales basees sur la connaissance de la raideur des pieces cylindriques de revolution ont ete proposees ainsi qu’une etude analytique avancee donnant des resultats satisfaisants dans le cas des pieces prismatiques. Enfin, la quatrieme partie propose une modelisation analytique du systeme vis ecrou permettant d’apprehender la repartition des efforts au niveau des filets, de la rigidite en flexion de l’ecrou et de la partie en prise de la vis. L’ensemble des etudes realisees sur les raideurs permet alors de construire des modeles simplifies equivalents a l’ensemble du boulon en elements finis. Work of this thesis consists of studying the stiffness of the components of the assemblies according to all the parameters defining the design. This study is based on a Finite Elements model validated by an experiment. It leads to models of calculation allowing a precise and fast determination of these stiffnesses. The first part deals with the interest to calculate with precision the equivalent stiffness of the parts and of the bolts for the dimensioning of the assembly, for a best tightening angle control or for a best application of the preload by hydraulic tension tool. The knowledge of the stiffness is also necessary to create a simplified model F E for the bolt. A critical study and an analysis of the principal methods of calculation of the equivalent stiffness proposed up to now show us significant differences between the formulations suggested. Consequently, it’s pertinent to make these studies again with the modern means of simulation. In the second time, we are interested in the justification of the methods of determination which make it possible to avoid the measurement of displacements, principal source of error noted in preceding work. So, we give all the results of the bolt’s and the cylindrical part’s stiffnesses according to the various parameters. Tests of tightening angle make it possible to validate the results of very many simulations carried out. The whole of this very significant work of simulations is summarized in the form of a practical method of calculation which allows a precise determination of the bolt’s and the cylindrical part’s stiffnesses in all the situations. In a third part, to complete the study, we are interested in the case of the prismatic parts with offset holes

1 citations


Cited by
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Journal ArticleDOI
TL;DR: In this article, an improved stiffness model for bolted joints made of similar and dissimilar plates is proposed, which provides a more reliable prediction of the joint behavior both during its initial assembly and under subsequently applied tensile loads in service.
Abstract: An improved stiffness model is proposed for bolted joints made of similar and dissimilar plates. A novel approach is used to obtain an expression for the effective area used for determining the joint stiffness. More accurate estimate of the joint stiffness provides a more reliable prediction of the joint behavior both during its initial assembly, as well as under subsequently applied tensile loads in service. The effect of the grip length-to-diameter ratio, joint sizes, underhead contact radii ratio, hole clearance, and plate material/thickness ratio are investigated. Experimental data are used for determining the envelope angle a in the proposed analytical model. Finite element modeling is used for evaluating the accuracy of the proposed stiffness model.

76 citations

Journal ArticleDOI
TL;DR: In this article, the anti-loosening performance of the MoS 2 coating on the bolt was investigated under various preloads and excitation amplitudes, and it was found that the performance was better than that of the other two coatings.

54 citations

Journal ArticleDOI
TL;DR: In this article, the authors discussed the reasons for the bolt tension loss, and solutions to prevent this Bolt tension loss are discussed, including the optimum use of Belleville springs (BeSs) and installing the bolts within the elastic range.

44 citations

Journal ArticleDOI
TL;DR: In this paper, the Discrete Ply Model Method (DPM) is extended to the case of out-of-plane loads in bolted joints and can lead to progressive punching of the fastener's head in the laminate resulting, in some cases, in a failure mode called pull-through.

44 citations

Journal ArticleDOI
TL;DR: In this paper, an analytical model is developed to evaluate load distribution in an aluminium-composite double-lap joint, in the presence of clearance and hole-location errors.

42 citations