Study of bolted joint axial stiffness using finite element analyses, experimental tests, and analytical calculations

Cardoso, Raphael Calazans; Nascimento, Brenno Lima; Thompson, Felipe de Freitas; Griza, Sandro

doi:10.1177/0954406220927066

Cited by 7 publications

(4 citation statements)

References 14 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…Therefore, this equation has very limited applicability. The concentrically loaded bolted joint was studied numerically and experimentally by Cardoso et al [16]. Their results agree very well with the analytical results using VDI 2230 [17].…”

Section: Shape and Dimensions Of A Bolted Flange Jointsupporting

confidence: 58%

Analysis of Additional Load and Fatigue Life of Preloaded Bolts in a Flange Joint Considering a Bolt Bending Load

Okorn

Nagode

Klemenc

et al. 2021

Metals

View full text Add to dashboard Cite

The influence of the working load on the dynamic loading of the bolt was investigated in our study for two cases of flange joints. The analytical calculation according to the Verein Deutscher Ingenieure (VDI) 2230 recommendation and the numerical analysis using the finite element method (FEM) were performed for a model of a four-bolt joint. To verify the FEM analysis, the forces in the bolts were measured during preloading and during the application of the working load on the test rig. Based on the analytical and numerical results, the influence of the working load application point on the bolt load and its fatigue life was analysed for different cases. Comparison of the results shows that the analytical method overestimates the additional bolt stresses at low working load, mainly due to the extremely large fraction of bending stress. As the working load increases, the differences between the two methods decrease, but only for the reason that the analytical method can only linearly scale the overestimated results at lower working load, and FEM analysis, on the other hand, shows a progressive increase of the additional stress in the bolt at higher working loads due to the spreading of the flange. It is also shown that a high washer significantly increases the fatigue life of the bolt for two reasons: (i) a high washer reduces the additional stress in the bolt, and (ii) the high washer shifts the critical fatigue point from the thread area to the transition of the bolt shank to the head.

show abstract

Section: Shape and Dimensions Of A Bolted Flange Jointsupporting

confidence: 58%

Analysis of Additional Load and Fatigue Life of Preloaded Bolts in a Flange Joint Considering a Bolt Bending Load

Okorn

Nagode

Klemenc

et al. 2021

Metals

View full text Add to dashboard Cite

show abstract

“…For example, Mathurin et al [5] presented a 3D FE model of thread forming screw during an assembly process, and compared the FE simulations of the radial displacement of thread material with experimental analyses. Moreover, Cardoso et al [6] performed FE analyses to predict the portion of external load distributed to the bolted joint. Recently, Liu et al [7] numerically studied, using ABAQUS and MATLAB, the effects of thread fit quality and friction coefficient on the axial load distribution of the bolted joint.…”

Section: Introductionmentioning

confidence: 99%

Finite Element Analyses of Bolted Joints Using Different Thread Modelling Techniques

2023

Teh. vjesn.

View full text Add to dashboard Cite

Intensive finite element analyses (FEA) were carried out to investigate the effects of thread modelling techniques on torque-force relation in threaded joints. The bolt thread was modelled by solid revolving the ISO thread profile and it was meshed using hexahedral elements. The nut thread was modelled either by solid/cut revolving the ISO thread profile, with/without root fillet or by using hexahedral/tetrahedral elements. Excellent agreement was found between torque-force relationship obtained using the FEA, the experimental result and the theoretical analyses. The FEA results showed the torque-force relationship is independent of both the modelling techniques and the mesh size but highly dependent on coefficient of friction between surfaces in contact. The study outputs support the simplified approach to use the tetrahedral elements to model threaded joints. The value of the equivalent coefficient of friction to be used is approximately the sum of the coefficients of friction at the threads and that at the bearing area.

show abstract

“…As with any problem, the scale of observation is important. Without giving an exhaustive list, we can mention many things that can influence preload: the speed of tightening, 15 the pitch of the threads, 16 the shape of the threads, 17 the friction coefficients at the contacts, [18][19][20] the tightening sequence, 21,22 the arrangement of the bolts, [23][24][25] the relaxation of the bolt, [26][27][28][29] the stiffness of the bolted joint, 30 the torsion of the screw, 31 or the number of times it is tightened. 32 Although the impact of these parameters is at the heart of the subject, more studies could be proposed to reduce the uncertainty they induce on the value of the preload installed.…”

Section: Introductionmentioning

confidence: 99%

Towards smart tightening in aeronautical assemblies

Foissac

Daidié

Segonds

et al. 2023

Proceedings of the Institution of Mechanical Engineers, Part C:

View full text Add to dashboard Cite

Exogenous disturbances, the tolerances of bolted joints, and the large number of possible combinations and configurations make it difficult to control the preload in bolted joints. Direct measurement of joint preload is not possible without calling upon laboratory testing or instrumented fasteners. The objective of smart tightening would be to compensate for the current dispersions by detecting events occurring during the tightening process that have an impact on the final value of the preload. Since the number of possible parameters, such as coating or diameter, to be considered in the selection of a bolted joint is large, this article focuses on a precise list of the main parameters characteristic of a bolted joint and the major dispersions they induce. It is first shown that dispersions in the joint parameters interfere with the evaluation of the torque and should be limited, in order to reduce the uncertainty of the preload in the joint. It is then shown that the contact torque and the tightening coefficient are key parameters for controlling the preload installed in the coupling. To detect the contact torque and tightening coefficient, a method based on real-time measurable data obtained with an instrumented screwdriver is also presented. Thus, the smart tightening method proposed in this article guarantees better respect of the preload target and limits the risks of over or under torque.

show abstract

Study of bolted joint axial stiffness using finite element analyses, experimental tests, and analytical calculations

Cited by 7 publications

References 14 publications

Analysis of Additional Load and Fatigue Life of Preloaded Bolts in a Flange Joint Considering a Bolt Bending Load

Analysis of Additional Load and Fatigue Life of Preloaded Bolts in a Flange Joint Considering a Bolt Bending Load

Finite Element Analyses of Bolted Joints Using Different Thread Modelling Techniques

Towards smart tightening in aeronautical assemblies

Contact Info

Product

Resources

About