Bolted circular flange connections under static bending moment and axial force

Couchaux, Maël; Hjiaj, Mohammed; Ryan, Ivor; Bureau, Alain

doi:10.1016/j.jcsr.2018.12.024

Cited by 28 publications

(7 citation statements)

References 9 publications

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“…under combined axial and bending moment loads [12]. They considered ductile and non-ductile failure modes while proposing the analytical model in order to determine the plastic bending moment of the structure.…”

Section: Couchaux Et Al Investigated a Theoretical Model For The Bolmentioning

confidence: 99%

Development of Artificial Neural Network Based Design Tool for Aircraft Engine Bolted Flange Connection Subject to Combined Axial and Moment Load

Sanli

Gürses

Çöker

et al. 2017

Volume 1: Advances in Aerospace Technology

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iv I hereby declare that all information in this document has been obtained and presented in accordance with academic rules and ethical conduct. I also declare that, as required by these rules and conduct, I have fully cited and referenced all material and results that are not original to this work. Name, Last name : Tahir Volkan SanlıSignature : v ABSTRACT DEVELOPMENT In this thesis, a design tool using artificial neural network (ANN) is developed for the bolted flange connections, which enables the user to analyze typical aircraft engine connections subjected to combined axial and bending moment in a fast yet very accurate way. The neural network trained for the design tool uses the database generated by numerous finite element analyses for different combinations of parametric design variables of the bolted flange connection. The defined parameters are the number of bolts, the bolt size, the shaft thickness, the flange thickness, the pretension load acting on the bolt and the combined external axial force and bending moment. The outputs gathered from total 12000 FE analyses are the bolt reaction force and the average flange stress, which are collected to be used as database for the ANN training process together with the input design parameters. The results of the trained ANN are then compared with the FEA results. The comparison proves that the neural network shows great compliance with the non-linear FEA within the range of design parameters. As the last step, a graphical user interface is developed to turn the neural network into a user-friendly bolted flange design tool. It is believed that the developed design tool can replace the non-linear finite element analysis and be vi used very effectively in an optimization framework for the weight minimization of cylindrical bolted flange connections of aircraft engines.

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Section: Couchaux Et Al Investigated a Theoretical Model For The Bolmentioning

confidence: 99%

Development of Artificial Neural Network Based Design Tool for Aircraft Engine Bolted Flange Connection Subject to Combined Axial and Moment Load

Sanli

Gürses

Çöker

et al. 2017

Volume 1: Advances in Aerospace Technology

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“…Figure 1 shows an actual inner-outer flange employed in a tubular transmission tower. Although the unstiffened SI/SO flange is recognized as a cost-effective connection, and widely implemented in tubular structures, the prying action 3 – 10 , which frequently occurs in the unstiffened flanges, would result in the increase of the bolt force, and thereby reduce the flange capacities that are mainly governed by the bolt strength. It is worth noting that various analytical models validated by experimental study 3 , 4 , finite element (FE) analysis 5 – 7 , or both 8 – 10 , were thus developed to accurately approximate the prying action.…”

Section: Introductionmentioning

confidence: 99%

“…Although the unstiffened SI/SO flange is recognized as a cost-effective connection, and widely implemented in tubular structures, the prying action 3 – 10 , which frequently occurs in the unstiffened flanges, would result in the increase of the bolt force, and thereby reduce the flange capacities that are mainly governed by the bolt strength. It is worth noting that various analytical models validated by experimental study 3 , 4 , finite element (FE) analysis 5 – 7 , or both 8 – 10 , were thus developed to accurately approximate the prying action. Stiffening the flange with ribs, as specified in both the Chinese and the Japanese codes 11 , 12 , is an effective method to reduce the prying action through enhancing the out-of-plane stiffness of the flange plate, and is therefore adopted in the inner-outer flanges.…”

Section: Introductionmentioning

confidence: 99%

Experimental /numerical study of a circular rib-stiffened flange connection with inner and outer flange plates under combined bending and tensile loading

Chen

Mou

Guo

et al. 2022

Sci Rep

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Focusing on circular rib-stiffened flange connections with inner and outer flange plates, termed inner-outer flange, the mechanical behavior of the flange subjected to the combined bending and tensile loading is experimentally studied. Four nominally identical specimens were utilized to investigate the effects of the eccentricity on the mechanical behavior. The distribution of the gap between flange plates, as well as the distribution of the bolt forces, is presented. It is found that the neutral axis would gradually approach the central axis of the flange connection, as the eccentricity increases. Moreover, provided the sufficiently strong ribs, welds, and flange plates, the capacity of the flange is found to be mainly predominated by the bolt strength. A good agreement is found in the comparison of the results obtained via the finite element analysis, the semi-analytic method (SAM) and the experimental study. It corroborates the validity of using the bolt failure assumption and the plane cross-section assumption in the SAM for approximating the capacity of the inner-outer flange. In terms of the interaction of the tensile capacity with the bending capacity, the experimental results along with those in the literature are compared with the curves defined by the codes, and suggestions for design are concluded. Yield capacity, defined as the load when the bolt stress reaches the yield strength, is recommended herein for the design of a structure under in-service condition. It is found the specifications in the current codes for the rib-stiffened flanges with a single flange plate would occasionally overestimate the yield capacity of the inner-outer flanges under the combined bending and tensile loading. Moreover, both the experimental and the numerical results show a linear load interaction curve, in terms of the ultimate capacity.

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“…Sawa 11 has proposed a novel method to obtain the load factor in a bolted pipe flange connection subjected to internal pressure and a method for determining a bolt pretension that respects an allowable leak rate. Other researchers, for example, Couchaud 12 and Abidelah, 13 are interested in determining the pretension applied in the bolts to guarantee non-separation of the assembled flanges. However, these analytical models cannot be used for the geometry of an aircraft wheel, as it cannot be considered as a cylindrical flange.…”

Section: Introductionmentioning

confidence: 99%

Mechanical strength of highly preloaded bolts affected by the ovalization of an aircraft wheel

Haddar

Daidié

Rodriguez

et al. 2022

Proceedings of the Institution of Mechanical Engineers, Part C:

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This work presented in this paper concerns the modeling of the tensile and bending behavior of bolts in an airplane wheel. The design of a very rigid airplane tire means that the airplane wheel must be separated into two parts. In order not to have a separation between the two parts, several bolts with high preload are used. The main objective of this work is to predict the mechanical behavior of this assembly in a preliminary design phase with geometrical and global mechanical data. To achieve this objective, a simplified semi-numerical 1D model is developed. The complex geometry of the wheels is modeled by axisymmetric elements, while beam elements define the geometries and mechanical behavior of the bolts. The model is improved in non-axisymmetric cases to include the ring effect due to the wheel ovalization. Different cases are simulated (inflation and rolling). For each load case, the most stressed fastener is examined. Then, a comparison between its static and fatigue stress results and those of the 3D finite element reference model considered is analyzed for the validation of the developed tool. The semi-numerical model is used in the preliminary design phase and permits the geometric and mechanical properties of the aircraft wheel and fasteners to be defined so as to find the best assembly configuration that prevents separation.

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Bolted circular flange connections under static bending moment and axial force

Cited by 28 publications

References 9 publications

Development of Artificial Neural Network Based Design Tool for Aircraft Engine Bolted Flange Connection Subject to Combined Axial and Moment Load

Development of Artificial Neural Network Based Design Tool for Aircraft Engine Bolted Flange Connection Subject to Combined Axial and Moment Load

Experimental /numerical study of a circular rib-stiffened flange connection with inner and outer flange plates under combined bending and tensile loading

Mechanical strength of highly preloaded bolts affected by the ovalization of an aircraft wheel

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