Pre-tensioning effect on fatigue life of bolted shear joints

Benhaddou, Taha; Chirol, Clément; Daidié, Alain; Guillot, Jean; Stéphan, Pierre; Tuery, Jean-Baptiste

doi:10.1016/j.ast.2014.03.003

Cited by 21 publications

(11 citation statements)

References 17 publications

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“…Given that components of the stress tensor are not proportional to loading and the principal directions vary during the loading, the amplitude of second invariant of deviatoric stress tensor has been replaced by the maximum amplitude of equivalent shear stress variation, thus allowing for more adapted calculations. Specific details on this calculation technique has been developed in previous research (Benhaddou et al, [2]), leading to the main equation used to calculate the fatigue life which is reported in the equation (3). is seen that the Crossland criterion agree with the experimental tests results very well and that SWT criterion tends to slightly overestimate fatigue lives, especially at high preload level.…”

Section: 6-application Of Swt and Crossland Criteriamentioning

confidence: 88%

“…The Crossland criterion (Crossland [9]) is a stress based multiaxial fatigue criterion which uses the second invariant of deviatoric stress tensor and maximum hydrostatic pressure in its equation (2).…”

Section: 6-application Of Swt and Crossland Criteriamentioning

confidence: 99%

“…A very high level of preload is not desirable either, since it generates fretting-fatigue phenomena or excessive fastener underhead over-pressure which can result a detrimental effect on the fatigue life of joints and structures. Therefore, preload controlled tightening produces and maintains a balance between the modes of load transfer mechanisms, making it possible to fully exploit their potential and to obtain an optimum clamping of the joint (Benhaddou et al [2]). The control of preload-linked parameters such as the nature of the joint interface, the fasteners stiffness's and the radial fitting nature could lead to perform further optimization of fastened joints.…”

Section: -Introductionmentioning

confidence: 99%

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Effect of Axial Preload on Double-Lap Bolted Joints: Numerical Study

Benhaddou

Stéphan

Daidié

et al. 2012

Volume 3: Advanced Composite Materials and Processing; Robotics; Information Management and PLM; Design Engineering

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This paper presents the numerical study of double-lap bolted joint behavior. This type of joint is mainly used in aeronautical structures to transfer the given loads (by both adhesion and by deformation-shearing). Recent articles, based on experimental fatigue tests conducted by AIRBUS, have shown the beneficial effects of preloading on the fatigue life of these joints. Finite element analyses were performed using ABAQUS® to study the behavior of a double-lap single-bolted joint with different plate thicknesses (joint thickness = 0.5d, 1d, 1.5d, 2d 2.5d, 3d, 3.5d and 4d, where d is the bolt diameter). The numerical model provides several important results. In the case of static loads, elasto-plastic constitutive laws of the bolt and the plate materials allowed the process to be simulated on the basis of tension tests. Mechanical aspects of this type of assembly are numerically identified; from the initial state of adhesion to the state of plastic deformation of parts in contact including the stage of generalized slippage. We note that the fracture load increases slightly when the bolted joint is preloaded while the failure area remains the same. In the case of large plate thickness, the connection is subjected to significant bending stresses and this involves strong local plasticization associated with the loss of preload. In the case of cyclic loading, we consider a numerical model based on the simulation of one loading/unloading cycle. A noticeable decrease in initial preload is observed for certain configurations, in particular those with the largest plate thickness. This phenomenon is related to the effect of strain hardening of the bolt during the first loading cycles. Some experimental work by AIRBUS has shown that the fatigue life of assemblies is dependent on the material plate thicknesses. An extension to the case of a multiple-bolted joint (three rows of three bolts) is finally discussed and highlights the evolution of the rate of load transmission with respect to the applied load.

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Section: 6-application Of Swt and Crossland Criteriamentioning

confidence: 88%

Section: 6-application Of Swt and Crossland Criteriamentioning

confidence: 99%

Section: -Introductionmentioning

confidence: 99%

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Effect of Axial Preload on Double-Lap Bolted Joints: Numerical Study

Benhaddou

Stéphan

Daidié

et al. 2012

Volume 3: Advanced Composite Materials and Processing; Robotics; Information Management and PLM; Design Engineering

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“…É necessário estudar e conhecer o desempenho de juntas aparafusadas para diversos tipos de carga, a fim de assegurar a integridade da união sem que ocorra a falha. Em decorrência disso, este assunto está em constante evolução e os estudos atuais buscam a otimização da performance em diferentes condições de operação (BENHADDOU et al, 2014) (ZHOU et al, 2015LEHTOVAARA;MÄNTYLA, 2016).…”

Section: Introductionunclassified

“…Através do conhecimento desses coeficientes é possível compreender a sua distribuição de carga, resistência mecânica e principalmente, vida em fadiga (NORTON, 2013;BUDYNAS, 2011). Este assunto é relevante pois a fadiga é a principal causa para falha em juntas aparafusadas submetidas à um carregamento (BENHADDOU et al, 2014) (SUN et al, 2017.…”

Section: Introductionunclassified

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2018

SODEBRAS

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Resumo-Os grandes impactos causados ao meio ambiente de forma geral tem demonstrado que a saúde dos povos sugere uma preocupação com rios, mares e com setores urbanos das cidades, onde as moradias tem causado esses efeitos preocupantes com as vidas sociais nos meios urbanos e as destruições do meio ambiente. O objetivo do artigo é analisar os impactos ambientais causados pela ausência de fossas sépticas nos domicílios em torno das margens da Bacia Hidrográfica de um bairro localizado ema Manaus. Os materiais e os métodos aplicados no estudo têm como subsídios as análises do padrão socioeconômico básico de dados oficiais do censo demográfico, grau de escolaridade, e saneamento. Sua realização é justificada pela importância de se discutir relações socioculturais com o ambiente natural e seus respectivos impactos para se construir comportamentos apropriados e políticas públicas. Os resultados mostraram que as implantações de fossas sépticas nos domicílios da região venham amenizar impactos negativos tanto ao meio ambiente como às pessoas que moram na circunvizinhança.

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Smart Tightening Development for Aeronautical Bolted Assemblies in an Industry 4.0

Foissac¹,

Daidié²,

Segonds³

et al. 2021

Lecture Notes in Mechanical Engineering

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Smart tightening development is part of the Industry 4.0 transformation with the introduction of smart tools, and preload in bolted assemblies is of major interest in today’s aircraft manufacturing process. So far, it has been difficult to estimate the importance of each parameter for tightening process quality, mainly because of the large number of combinations and configurations that exist.The present work aims at evaluating the effects and the interactions between different parameters that have to be taken in consideration in future torquing strategy. Many experimental tests have been conducted on an Automatica test bench using a Taguchi strategy and an analysis of the first main results is now presented, highlighting the complexity of the phenomena studied.All these points will help us to better understand tightening, so as to improve performance during installation, maintenance and repair.

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Pre-tensioning effect on fatigue life of bolted shear joints

Cited by 21 publications

References 17 publications

Effect of Axial Preload on Double-Lap Bolted Joints: Numerical Study

Effect of Axial Preload on Double-Lap Bolted Joints: Numerical Study

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Smart Tightening Development for Aeronautical Bolted Assemblies in an Industry 4.0

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