The interactive effects of wrinkling and other defects in thin-walled tube NC bending process

Li, Hengyun; Yang, He; Zhan, Mei; Gu, R.J.

doi:10.1016/j.jmatprotec.2006.11.100

Cited by 44 publications

(9 citation statements)

References 5 publications

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“…Zhan et al [4][5][6] developed a three-dimensional (3D) rigidplastic FE simulation software package oriented toward NC bending processes for thin-walled tubes without considering springback, proposed a numerical-analytic method for prediction of the springback angle, and applied the method to the bending of stainless steel and aluminum alloy tubes. Li et al [7,8] and Gu et al [9,10], using both explicit and implicit FEMs, developed a whole-process simulation model for thin-walled stainless steel and aluminum alloy tubes, including the bending, mandrelextraction, and springback process, and carried out studies on wrinkling, flattening, and springback. However, much of the work done in the above investigations focused on pure bending, localheating bending, and NC bending of stainless steel and aluminum tubes.…”

Section: Introductionmentioning

confidence: 99%

Establishment of a 3D FE model for the bending of a titanium alloy tube

Jiang

Yang

Zhan

et al. 2010

International Journal of Mechanical Sciences

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Section: Introductionmentioning

confidence: 99%

Establishment of a 3D FE model for the bending of a titanium alloy tube

Jiang

Yang

Zhan

et al. 2010

International Journal of Mechanical Sciences

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“…The test pipe represented in Fig. 2a is generally manufactured by Numerical Control (NC) bending processes using a roller with its origin at o and flexible mandrels [17]. The coordinate of point o is given by [1.5d, 1.5d] where d is the diameter of the pipe.…”

Section: Test Benchmentioning

confidence: 99%

Design of a Piping Inspection Robot by Optimization Approach

VENKATESWARAN¹,

Chablat²,

Hamon³

2021

Preprint

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This article presents an optimization approach for the design of an inspection robot that can move inside variable diameter pipelines having bends and junctions. The inspection robot uses a mechanical design that mimics the locomotion of a caterpillar. The existing prototype developed at LS2N, France is a rigid model that makes it feasible for working only inside straight pipelines. By the addition of a tensegrity mechanism between motor units, the robot is made reconfigurable. However, the motor units used in the prototype are oversized to pass through pipe bends or junctions. An optimization approach is employed to determine the dimensions of motors and their associated leg mechanisms that can overcome such bends. Two optimization problems are defined and solved in this article. The first problem deals with the determination of motor sizing without leg mechanisms. The second problem deals with the determination of sizing of the leg mechanism with respect to the dimensions of motor units obtained from the first problem. A 3D model of the optimized robot design is then realized using CAD software.

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“…Bending lumbers are usually manufactured from straight lumber, which have the ability to spring back as original state changed. However, bending defects, such as wrinkling 1 , 2 , cross-section deformation 3 – 5 , and variations in wall thickness 6 can have negative impact on the bending process 7 and the bending components safety and service life. As a result, testing, evaluation and analysis of bending defects play an important role in bent member’s application.…”

Section: Introductionmentioning

confidence: 99%

Effect of bending on radial distribution density, MFA and MOE of bent bamboo

Fei

et al. 2022

Sci Rep

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One of the excellent characteristics of bamboo is the deformation stability. However, the reasons for the good bending stability of bamboo have not been well studied. In this study, we examined the pathways that controls bending deformation in bamboo. A hand-bent phyllostachys iridescens member was chosen to examine continuous density distribution, microfibril angle (MFA) and modulus of elasticity (MOE) along radial direction using SilviScan analysis. Our results show that in bent bamboo, MFA is lower in tension sample and higher in compression sample than neutral sample. There is a strong linear positive correlation between density and MOE, while negative linear correlation between MOE and MFA and no obvious linear correlation between MFA and density. Increased bending was influential in primarily changing the MOE, while also altering the density distribution and MFA. Our results demonstrate variation in density, MOE and MFA distribution along radial direction of tension, neutral and compression samples, which play an important role in maintaining the bending characteristics of bamboo.

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The interactive effects of wrinkling and other defects in thin-walled tube NC bending process

Cited by 44 publications

References 5 publications

Establishment of a 3D FE model for the bending of a titanium alloy tube

Establishment of a 3D FE model for the bending of a titanium alloy tube

Design of a Piping Inspection Robot by Optimization Approach

Effect of bending on radial distribution density, MFA and MOE of bent bamboo

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