An alternative numerical approach for full scale characterisation for riveted joint design

Langrand, Bertrand; Patronelli, L.; Deletombe, E.; Markiewicz, Éric; Drazétic, P.

doi:10.1016/s1270-9638(02)01174-4

Cited by 47 publications

(30 citation statements)

References 5 publications

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“…The discrepancy in the radial strain between the microstrain gauge results and FEM predictions are also found elsewhere 10,11 and can be explained as follows: 1) The constitutive models for the sheet and rivet used in the FEM could be inaccurate. 2) The material properties and surface were assumed perfect in the FEM, which is unrealistic.…”

Section: A Comparison Of Microstrain Gauge Results With Fem Predictimentioning

confidence: 53%

“…Because microstrain gauges are capable of capturing the strain variations on a lap joint surface during the riveting process, the variation in the load history can be determined. 10,11,14,16 The microstrain gauge method is convenient, cheap, and reliable; however, it can only determine the strain variation at the surface. Because neutrons penetrate many centimeters through aluminum alloys, neutron diffraction has been used as a nondestructive technique to measure the internal strains present in aluminum components.…”

Section: Introductionmentioning

confidence: 99%

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Study of the Residual Strain in Lap Joints

Shi

Bellinger

2006

Journal of Aircraft

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Both experiments and finite element analysis were carried out to study the residual strain (stress) in the riveted lap joint for a better understanding of the fatigue life of fuselage lap joints. A force-controlled riveting process was used to apply a constant load ramp to install the rivets. Strain variations on the joint surface were measured using microstrain gauges during the riveting process. Because neutrons are known to penetrate through many centimeters of aluminum alloys, neutron diffraction was used to provide a nondestructive technique to determine strains at certain depths in the joint. Parallel to the experimental testing, a two-dimensional axisymmetric finite element model was developed to simulate the riveting process. Both material and geometric nonlinearities, as well as nonlinear contact boundary conditions, were used in this numerical model. Comparisons between the numerical simulations and experimental results focused on the rivet driven head deformations and strain variations, and the results showed that the current two-dimensional axisymmetric finite element model using the proper boundary conditions can reliably be used to determine the residual strains (stresses) present in joints that were induced during the riveting process. Nomenclature C= material parameter D = rivet shank diameter D max = maximum rivet shank diameter after riveting d = spacing between lattice plane d 0 = stress-free lattice spacing E = Young's modulus m = material parameter r = distance to fastener hole centre ε = normal strain ε true = true strain θ = diffracted neutrons' angle λ = wavelength of the incident neutron beam ν = Poisson's ratio σ = normal stress σ true = true stress beyond the initial yield stress σ y = initial yield stress

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Section: A Comparison Of Microstrain Gauge Results With Fem Predictimentioning

confidence: 53%

Section: Introductionmentioning

confidence: 99%

Study of the Residual Strain in Lap Joints

Shi

Bellinger

2006

Journal of Aircraft

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“…Several kinds of elements can be found in literaturesuch as beams (Hu et al, 1993), non-linear springs (Combescure et al, 2003), cohesive-zone element to model fracture (Cavalli et al, 2005), structural finite elements (Ekh and Schön, 2008) or full 3D representation (Dannbauer et al, 2006); however, they often oversimplify the description of the complex mechanical behaviour of the joint. Hybrid representations (Langrand et al, 2002;Bedair and Eastaugh, 2007;Longuet, 2004;Bermann, 2006), more complex, enable defining a connection with more information. The design of the equivalent element presented in this paper and its reduction to a simpler model using the connector concept are based upon this kind of approach.…”

Section: Introductionmentioning

confidence: 99%

An innovative strategy to create equivalent elements for modelling assembly points in joined structures

Bérot¹,

Malrieu²,

Bay³

2014

Engineering Computations

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International audiencePurpose - Large structures (e.g. plane, bridge, etc.) often include several hundreds of assembly points. Structural computations often use over-simplistic approximations for these points; among others, they do not take into account the thermo-mechanical history due to the assembling process. Running computations with each assembly point modelled completely would require too much time to achieve a simulation. There is thus a need to create equivalent elements for assembly points in order to: take into account the mechanical state of the assembly point in the design stage - while reducing the computational time cost at the same time. This paper aims to discuss these issues. Design/methodology/approach - This paper introduces an innovative strategy based on a coupling procedure between a finite element tool for modelling the assembly process in order to access to the mechanical state of the assembly point and an optimisation algorithm, in order to identify the equivalent element parameters. Findings - The strategy has proven to be successful. A connector model easier to use and much faster than the complete model, has been obtained. Results obtained with this element are in good agreement with experimental tests in the case of multipoint assemblies and with the simulation results of the complete numerical model. Finally the connector model appears to be easier to use and much faster than the complete model, more difficult to model properly. Originality/value - The main innovative aspects of this strategy lie in the fact that the creation of this equivalent element is based on a complete numerical approach. The thermo-mechanical history due to the assembly process is considered - the element parameters are identified thanks to an evolution strategy based on the coupling between a finite element model and a zero-order minimisation algorithm

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“…The stress condition is further complicated by stress concentrations in the fastener hole region, due to the existence of the countersunk holes, and residual stresses around the hole induced by the riveting process. [1][2][3][4][5][6][7][8] The magnitude of the induced residual stress is directly dependent on the rivet squeeze force. 1,4,6 Large compressive residual stress in the hole vicinity is created by large rivet squeeze force (RSF), which can greatly improve the joint fatigue life.…”

Section: Introductionmentioning

confidence: 99%

“…The material elastoplastic constitutive relationship and geometric non-linear properties, as well as nonlinear contact boundary conditions, were included in the numerical models. [16][17][18][19] A literature review [1][2][3][4][5][6][7][8][9][10][11][12][13][14][15][16][17][18][19] showed that there was little quantitative study available on the effect of the clearance fit and friction coefficient on the stress/strain variation in triple-row countersunk riveted lap joints. Furthermore, an accurate numerical analysis of the corrosion pillowing effect on the stress state in lap joints is also needed.…”

Section: Introductionmentioning

confidence: 99%

Effects of Clearance Fit and Friction Coefficient on Triple-Row Riveted Lap Joints

Li¹,

Shi²,

Bellinger³

2010

51st AIAA/ASME/ASCE/AHS/ASC Structures, Structural Dynamics, and Materials Conference

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/npsi/ctrl?lang=en http://nparc.cisti-icist.nrc-cnrc.gc.ca/npsi/ctrl?lang=fr READ THESE TERMS AND CONDITIONS CAREFULLY BEFORE USING THIS WEBSITE.http://nparc.cisti-icist.nrc-cnrc.gc.ca/npsi/jsp/nparc_cp.jsp?lang=en Vous avez des questions? Nous pouvons vous aider. Pour communiquer directement avec un auteur, consultez la première page de la revue dans laquelle son article a été publié afin de trouver ses coordonnées. Si vous n'arrivez pas à les repérer, communiquez avec nous à PublicationsArchive-ArchivesPublications@nrc-cnrc.gc.ca. Effects of fastener clearance fit, friction coefficient, and corrosion pillowing on the stress state in triple-row riveted lap joints were studied numerically using three-dimensional finite element methods. The material elastoplastic constitutive relationship and geometric nonlinear properties, as well as nonlinear contact boundary conditions, were included in the numerical simulations. The numerical modeling was validated using experimental measurements of the rivet driven head deformation and in-situ strains. The lap joints were loaded in tension after riveting. Three different clearance fits, three different friction coefficients, and four corrosion pillowing conditions were analyzed. The stress variation along prescribed paths during the tensile loading stage is discussed for each of these conditions. Full-field contours of the friction and maximum principal stresses during the tensile loading stage were investigated. Numerical results showed that a small increase in the clearance fit considerably increased the joint stress magnitude. The clearance fit magnitude also affected the maximum stress location in the vicinity at the top fastener hole. A large friction coefficient increased the contact and friction stresses in the hole vicinity. These results could explain the scatter degree of the fatigue data and could be used to improve the manufacture quality for high fatigue-rated riveted lap joints. Serious corrosion pillowing significantly increased the stress magnitude at both the middle and top hole regions, and led to the co-existence of the two highly-stressed areas in the outer sheet, which greatly decreased the integrity of the aged riveted lap joint due to the occurrence of the multiple-sited damages during cyclic loading. Questions Nomenclature

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An alternative numerical approach for full scale characterisation for riveted joint design

Cited by 47 publications

References 5 publications

Study of the Residual Strain in Lap Joints

Study of the Residual Strain in Lap Joints

An innovative strategy to create equivalent elements for modelling assembly points in joined structures

Effects of Clearance Fit and Friction Coefficient on Triple-Row Riveted Lap Joints

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