Effect of axial preload on durability of aerospace fastened joints

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

doi:10.1016/j.ijmecsci.2018.01.023

Cited by 27 publications

(13 citation statements)

References 18 publications

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“…Two screws are installed side by side on a ball screw, and the axial pretightening force is adjusted by adjusting the thickness of the pretightening gasket between the two screws. [20]. Here, nut A, which bears the working load, is the working nut, whereas nut B, which does not bear the working load, is the pretightening nut.…”

Section: Internal Load Distribution Of Double-nut Ball Screwsmentioning

confidence: 99%

Theoretical Calculation and Simulation Analysis of Axial Static Stiffness of Double‐Nut Ball Screw with Heavy Load and High Precision

Luo

Jiao

et al. 2019

Mathematical Problems in Engineering

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Double-nut ball screws bear the action of bidirectional pretightening force, leading to the deformation of the contact area between the ball and the raceway. Under this condition, it is important to analyze and calculate the static stiffness of the ball screw. However, the conventional calculation method is inaccurate. Hence, a new method for the static stiffness analysis of a double-nut ball screw is proposed. Through the structural analysis of the ball screw and internal load distribution, a load deformation model was established based on the Hertzian contact theory. Through the load analysis of the ball screw, a static stiffness model of the ball screw was established and applied to a case study and a finite element simulation. The rigidity of THK double-nut ball screws used in the X-axis feed system of a high-stiffness heavy-duty friction stir welding robot (developed by the research group) was calculated. When the workload was lower than 1.1 × 104 N, the slope of the double-nut static stiffness curve increased significantly with the increase in the workload, and when the workload was greater than 1.1 × 104 N, its upward slope tended to stabilize. The simulated and experimental stiffness curves were in good agreement; when the external axial load was greater than 2.8 × 104 N, the stiffness value calculated using the finite element method gradually converged to the theoretical value; and when the axial load reached 3.0 × 104 N, the simulation and test curves matched well. The analysis method of the double-nut ball screw was found to be concise and accurate, and the stiffness curves calculated using the two methods were consistent. The simulation analysis of the static stiffness presented herein is expected to aid the design of double-nut ball screws of high-rigidity heavy-duty equipment.

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Section: Internal Load Distribution Of Double-nut Ball Screwsmentioning

confidence: 99%

Theoretical Calculation and Simulation Analysis of Axial Static Stiffness of Double‐Nut Ball Screw with Heavy Load and High Precision

Luo

Jiao

et al. 2019

Mathematical Problems in Engineering

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“…The aim of this research work was to develop a predictive tool to better control tightening behaviour through the torque/tension relationship, integrating strongly non-linear local phenomena. Controlling the preload within the bolted assembly can be beneficial for the integrity of the aircraft [1,2] but this tool developed for an industry 4.0 which is geolocated and able to feed a dynamic database can also be an advantage for quality control and maintenance [3]. However, the preload is a very dispersive variable [4] and is difficult to control in production with current clamping tools [5].…”

Section: Introductionmentioning

confidence: 99%

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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“…The interference fit has been widely used in heavy machinery, aerospace, and new energy fields because of its advantages of high assembly accuracy, compact structure, and the ability to withstand complex loads. 1,2 For an interference fit, the torque capacity is the ultimate torque to resist the relative rotation between two assembly parts. It measures the resistance of the assembly to the torque, which is mainly determined by the contact pressure and friction coefficient between the contact surfaces.…”

Section: Introductionmentioning

confidence: 99%

Torque capacity of the multilayer interference fit based on a friction coefficient prediction model

Ning

Wang

Xiang

et al. 2021

Proceedings of the Institution of Mechanical Engineers, Part J:

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This paper proposes the theoretical model of a multilayer interference fit and gives out the relational expression between radial interference and friction coefficient. Taking the typical wind turbine's shrink disk of a three-layer interference fit structure as an example, special experimental equipment is developed to test the torque capacity. Based on experimental results and the theoretical model, the mathematical expressions of radial interference and assembly stroke for friction coefficient are obtained by polynomial fitting, and the prediction model of friction coefficient is established. The three-dimensional finite element model of a shrink disk is constructed by applying the friction coefficient prediction model. With the mathematical expressions of radial interference and assembly stroke for the torque capacity, the rules of main dimension parameters and torque capacity are analyzed. The maximum relative error between experiment and simulation is 8.2%, which shows the feasibility of finite element simulation. The results of our study have certain guidance for the prediction of friction coefficient and the manufacture of the multilayer interference fit.

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Effect of axial preload on durability of aerospace fastened joints

Cited by 27 publications

References 18 publications

Theoretical Calculation and Simulation Analysis of Axial Static Stiffness of Double‐Nut Ball Screw with Heavy Load and High Precision

Theoretical Calculation and Simulation Analysis of Axial Static Stiffness of Double‐Nut Ball Screw with Heavy Load and High Precision

Smart Tightening Development for Aeronautical Bolted Assemblies in an Industry 4.0

Torque capacity of the multilayer interference fit based on a friction coefficient prediction model

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