Investigation on the influence of weld position on the deformation behavior of welded tube during free bending process

Cheng, Cheng; Pan, Chao; Bai, Xueshan; Liu, Chunmei; Guo, Xunzhong

doi:10.1007/s00170-022-08893-y

Cited by 6 publications

(1 citation statement)

References 23 publications

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“…Zhu et al [ 9 ] developed a theoretical analysis model based on this model that can calculate the springback angle of rectangular H96 tubes. Cheng et al recently improved the analytical model to allow the mechanical analysis of thin-walled tubes with mandrel support or welds [ 10 , 11 ]. Meanwhile, Li et al established a hybrid analytical–numerical model based on axial force balance to analyze the neutral layer shifting (NLS) phenomenon in the process of tube bending and thus proposed an innovative process to improve bend formability by analyzing the equilibrium conditions of bending moment and force in the process of tube bending [ 12 ].…”

Section: Introductionmentioning

confidence: 99%

Mechanical Modeling of Tube Bending Considering Elastoplastic Evolution of Tube Cross-Section

Zhang

et al. 2022

Materials

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Aluminum alloy tubes are widely used in various industries because of their excellent performance. Up to now, when the tube is bent, the elastoplastic deformation evolution mechanism of the cross-section has not been clear, and no direct analytical proof has been found. In this paper, based on the bilinear material model assumption, a new mechanical model of tube plane bending deformation is constructed. The analytical model can describe in detail the evolution mechanism of elastic–plastic deformation on the cross-section of the tube after bending deformation, the position of the elastic–plastic boundary, the position of the radius of the strain neutral layer, and the relationship between the bending moment over the section and the bending radius. According to this model, the deformation law of the tube cross-section during bending is elucidated. The results are as follows: (1) the deformation evolution of the cross-section of the bending deformed tube calculated by the analytical model is in good agreement with the finite element model (FEM) of pure bending. (2) By comparing the results of the analytical model with FEM results, and the processing test of the self-designed four-axis free bending forming tube bender, the bending moments are in good agreement. (3) Compared with the bending moments calculated by several other analytical models of tube bending, this model has a relatively small deviation value.

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Section: Introductionmentioning

confidence: 99%

Mechanical Modeling of Tube Bending Considering Elastoplastic Evolution of Tube Cross-Section

Zhang

et al. 2022

Materials

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Investigation on variation characteristics of bent tube axis and determination of bending die motion trajectory in free bending process

Cheng

et al. 2022

Int J Adv Manuf Technol

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In free bending process, the axis shape of bent tube is determined by the motion path of bending die. The bent tubes with different bending radii and bending directions can be integrally formed at one time by continuously adjusting the position and posture of die. To accurately form the pre-designed bent tube, the formation mechanism of bending arc of tube in free bending process was analyzed. The mathematical model between bending radius and de ection was established and the moving direction of bending die was also determined according to the plane space azimuth where the bending arc segment is located.The formation process of transition segments with variable curvature and variable bending direction is illustrated during the movement of bending die and the in uence law of transition segment on the axis shape was also explored. By comparing the axis deviation of experimental and simulate bent tubes, the length of transition segment and the moving path of bending die can be optimized. Finally, the applicability of free bending forming technology in forming bent tubes with different shape features was veri ed by conducting the free bending experiments on bent tubes with three typical shapes. Due to the high exibility of free bending forming technology, the work in this paper could promote the engineering application of this technology in the precise control of axis shape of bent tube.

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Theoretical analysis, finite element modeling and experimental investigation of the impact of friction between tube and bending die on the formability of the tube during the free-bending process

Cheng,

Wei,

Zhang

et al. 2023

CIRP Journal of Manufacturing Science and Technology

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Investigation on the influence of weld position on the deformation behavior of welded tube during free bending process

Cited by 6 publications

References 23 publications

Mechanical Modeling of Tube Bending Considering Elastoplastic Evolution of Tube Cross-Section

Mechanical Modeling of Tube Bending Considering Elastoplastic Evolution of Tube Cross-Section

Investigation on variation characteristics of bent tube axis and determination of bending die motion trajectory in free bending process

Theoretical analysis, finite element modeling and experimental investigation of the impact of friction between tube and bending die on the formability of the tube during the free-bending process

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