An analytical model for the collapsing deformation of thin-walled rectangular tube in rotary draw bending

2013 ◽  
Vol 69 (1-4) ◽  
pp. 627-636 ◽  
Author(s):  
K. X. Liu ◽  
Y. L. Liu ◽  
H. Yang
Keyword(s):  
Analytical Model ◽  
Rotary Draw Bending ◽  
Rectangular Tube ◽  
Thin Walled ◽  
Draw Bending

Plastic Deformation Characteristics Analysis in Rotary-Draw Bending Process of Thin-Walled Rectangular Tube

2010 ◽  
Vol 97-101 ◽  
pp. 320-323
Author(s):  
Gang Yao Zhao ◽  
Yu Li Liu ◽  
He Yang
Keyword(s):  
Plastic Deformation ◽  
Equivalent Stress ◽  
Neutral Plane ◽  
Fe Model ◽  
Deformation Characteristics ◽  
Rotary Draw Bending ◽  
Bending Process ◽  
Rectangular Tube ◽  
Thin Walled ◽  
Draw Bending

The rotary-draw bending process of thin-walled rectangular tube is a complex process with large deformation, large displacement and finite strain which makes the defects, such as wrinkling, distortion and crack be easily produced. To study the complex plastic deformation characteristics, a 3D-FE model for the process was built and validated by experiments. Then simulation and analysis of complex plastic deformation characteristics of the process were carried out. The results show that the distributions of stress and strain are symmetric, and its peak values appear in the edges of tube. With the increase of bending angle, the equivalent stress and equivalent strain initially increase and then reach at a stable value, whereas the fluctuant phenomenon of tangent stress is produced. The moving of the neutral plane of stress can be ignored; however, the moving of neutral plane of strain is more obviously.

Effect of Geometry Parameters on Cross-Sectional Distortion of Thin-Walled Rectangular Tube in Rotary-Draw Bending Process

2011 ◽  
Vol 189-193 ◽  
pp. 2784-2787 ◽  
Author(s):  
Yu Li Liu ◽  
Gang Yao Zhao ◽  
Jin Zhang ◽  
He Yang
Keyword(s):  
Finite Elements ◽  
Geometrical Parameters ◽  
Rotary Draw Bending ◽  
Deformation Degree ◽  
Cross Sectional ◽  
Bending Process ◽  
Rectangular Tube ◽  
Thin Walled ◽  
Draw Bending ◽  
Finite Elements Model

In rotary-draw bending process of thin-walled rectangular tube, cross-sectional distortion is an unwanted byproduct, which is closely related to geometry parameters. To study the effects of geometry parameters on cross-sectional distortion, a 3-D finite-elements model was built under the ABAQUS/Explicit environment, and its reliability was validated by experiments. Then, simulation and analysis of the influence laws of geometrical parameters on cross-sectional deformation degree were carried out. The results show that increases with the increase of b/h and decreases with the increase of R/h when b/h>1. However, R/h has little influence on δh when b/h≤1. And the influence of b on δh is larger than that of h, and the effect of h on δh is larger than that of R.

Numerical Simulation on Influence of Clearance and Friction on Wrinkling in Bending of Aluminum Alloy Rectangular Tubes

2007 ◽  
Vol 546-549 ◽  
pp. 833-838 ◽  
Author(s):  
Gang Yao Zhao ◽  
Yu Li Liu ◽  
He Yang
Keyword(s):  
Aluminum Alloy ◽  
Friction Coefficient ◽  
Model Simulation ◽  
Three Dimension ◽  
Rotary Draw Bending ◽  
Fem Model ◽  
Bending Process ◽  
Rectangular Tube ◽  
Thin Walled ◽  
Draw Bending

The clearance and friction have large influence on wrinkling in rotary draw bending process of thin-walled rectangular tube. In this paper, a three-dimension Al FEM model of rotary draw bending of thin-walled rectangular tube is built under the ABAQUS/ Explicit environment. Based on the model, simulation and analysis of rotary draw bending for aluminum alloy 3A21 thin-walled rectangular tube have been carried out. The results show that the height of wrinkling wave decreases obviously with the decrease of the clearance between mandrel and tube or with the increase of the friction coefficient between wiper die and tube; however, the effect of friction coefficient on wrinkling becomes weaker while increasing the clearance between mandrel and tube. The achievements of this study provide a guideline for determining the process parameters for thin-walled rectangular tube in rotary draw bending process.

Experimental Research on Strain Distribution Characteristics of Thin-Walled Rectangular Tube in Rotary-Draw Bending

2010 ◽  
Vol 139-141 ◽  
pp. 502-505 ◽  
Author(s):  
Shan Tian ◽  
Yu Li Liu ◽  
Gang Yao Zhao ◽  
He Yang
Keyword(s):  
Strain Distribution ◽  
Compressive Strain ◽  
Grid Method ◽  
Normal Strain ◽  
Rotary Draw Bending ◽  
Tangential Strain ◽  
Rectangular Tube ◽  
Middle Cross Section ◽  
Thin Walled ◽  
Draw Bending

The rotary-draw bending process of thin-walled rectangular tube is a complex process with large deformation, large displacement and finite strain which makes the defects, such as wrinkling, distortion and crack be easily produced. To study the complex plastic deformation characteristics of thin-walled rectangular 3A21 aluminum tube during rotary-draw bending, the distributions of tangential, circumferential and normal strain have been studied by experiment using grid method. The results show that the maximum value of three-direction strain appears in the ridges of rectangular tube and tangential strain is the maximum principal strain. The value of maximum tangential tensile strain is lager than the maximum tangential compressive strain; it is the reason why crake is prone to occur during rotary-draw bending. The strain distribution curve along bending direction is not completely symmetrical with middle cross-section. With the increase of bending angle, three-direction strain of tube also increases and circumferential strain increases relatively smaller.

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