The analytical model of ball-spinning force for processing an annular groove on the inner wall of a steel tube

2017 ◽  
Vol 91 (9-12) ◽  
pp. 4183-4190
Author(s):  
Zhao Chunjiang ◽  
Xiong Jie ◽  
Huo Xiaodong ◽  
Jiang Lianyun ◽  
Liu Jiefeng ◽  
...  
Keyword(s):  
Analytical Model ◽  
Steel Tube ◽  
Ball Spinning ◽  
Spinning Force

Three-directional contact force model for the ball spinning of a thin-walled tube

2018 ◽  
Vol 233 (3) ◽  
pp. 500-507
Author(s):  
Chun-jiang Zhao ◽  
Meng-ying Su ◽  
Zheng-yi Jiang ◽  
Jiang Lian-yun ◽  
Xiaorong Yang ◽  
...  
Keyword(s):  
Frictional Heating ◽  
Contact Boundary ◽  
Force Model ◽  
Calculation Error ◽  
Coordinate Plane ◽  
Thin Walled Tube ◽  
Ball Spinning ◽  
Thin Walled ◽  
Force Calculation ◽  
Spinning Force

This paper provides a computational model for calculating three-directional ball spinning force in accordance with the theory of space analytic geometry. The contact boundary equation of the ball and tube is obtained. By projection, the two-dimensional curve in each coordinate plane is acquired. The projected area of the contact zone in the coordinate plane is calculated through the curve integral. It is assumed that the average pressure of the forming region is nearly equal to that when the steel ball is pressed into the tube. Hence, the unit pressure of the deformation zone is obtained. Then, the spinning component force and total spinning force are calculated. Using a Tu1 thin-walled tube of oxygen-free copper as experimental object, a ball spinning experiment is conducted, the axial spinning components force are tested and the ball spinning force calculation model is verified. Based on deformation rate, backward sliding accumulation and extension and frictional heating, the factors influencing calculation error are analysed at the end of this paper.

Finite Element Simulation of Backward Ball Spinning of Thin-Walled Tube with Longitudinal Inner Ribs

2010 ◽  
Vol 97-101 ◽  
pp. 111-115 ◽  
Author(s):  
Yan Qiu Zhang ◽  
Shu Yong Jiang ◽  
Yu Feng Zheng ◽  
Li Hong Zhao
Keyword(s):  
Finite Element ◽  
Deformation Zone ◽  
Compressive Strain ◽  
Tangential Direction ◽  
Force Component ◽  
Element Simulation ◽  
Ball Spinning ◽  
Thin Walled ◽  
Force Components ◽  
Spinning Force

Backward ball spinning is applied to manufacturing thin-walled tubular part with longitudinal inner ribs. Rigid-plastic finite element method (FEM) is used to simulate and analyze backward ball spinning of thin-walled tubular part with longitudinal inner ribs. The fields of stress and strain in the deformation zone of the spun part are obtained by means of FEM. Finite element simulation results show that the deformation zone of the spun part is caused to be in a three-dimensional compressive stress state. The deformation zone in the inner rib is under the tensile strain in the radial and axial direction, and the compressive strain in the tangential direction. The wall deformation zone beside the inner rib is under the compressive strain in the radial direction, and the tensile strain in the axial and tangential direction. The three spinning force components all increase with the increase of the stroke of the ball. Furthermore, of all the three spinning force components, the radial force component is greater than the other two force components, and the tangential force component is minimum.

Three-Dimensional Analytical Simulation of Flexible Pipe Wall Structure

1992 ◽  
Vol 114 (2) ◽  
pp. 69-75 ◽  
Author(s):  
J. F. McNamara ◽  
A. M. Harte
Keyword(s):  
Analytical Model ◽  
Mechanical Response ◽  
Three Dimensional ◽  
Steel Tube ◽  
Critical Parameters ◽  
Rubber Matrix ◽  
Wall Structure ◽  
Flexible Pipe ◽  
Steel Cable ◽  
Detailed Assessment

A three-dimensional analytical model of the mechanical response of a bonded layered flexible pipeline section to a general set of loads and pressures is presented. Stiffness relations for isotropic, orthotropic and helically wound armoring layers are developed and combined to form a total section stiffness equation incorporating inter-layer pressures and radial deformations. These layers may be used to model the mechanical responses of flexible pipelines including any number and order of layers. Typical loads are taken from a three-dimensional analysis of a flexible production riser in a steep-wave configuration in 310 m water depth. An illustrative pipe section with five layers, including an inner steel tube, two contrawound steel cable layers and two modeled with rubber matrix materials, is subjected to this three-dimensional load set. Computations show the dominant influence of the steel strands in carrying the ambient loads and also gives an accurate picture of the radial distribution of inter-layer pressures across the pipe thickness. The analytical model is designed to give a detailed assessment of deformations and stresses in the various layers such that estimates may be made of critical parameters including wear, slip, rupture, debonding and other related aspects of flexible pipe performance.

Effect of Wall Thickness of the Billet on 1Cr18Ni9 Stainless Steel Tube Stagger Spinning Process

2014 ◽  
Vol 852 ◽  
pp. 244-247
Author(s):  
Shu Heng Yang ◽  
Xue Li Wang
Keyword(s):  
Finite Element Method ◽  
Stainless Steel ◽  
Wall Thickness ◽  
Metal Flow ◽  
Steel Tube ◽  
Stainless Steel Tube ◽  
Flow Rule ◽  
Spinning Process ◽  
Inner Diameter ◽  
Spinning Force

The stagger spinning process of 1Cr18Ni9 tube was investigated by using finite element method. The metal flow rule around the roller during the tube stagger spinning was analyzed. The influences of wall thickness of the billet on effective stress and spinning force were studied using software Deform. The simulated results indicate that the proper wall thickness of the billet should be 8~15 mm, for the billet with length of 100mm and inner diameter of 200mm.

A Finite Element Model for Prediction of the Bending Stress of Umbilicals

2017 ◽  
Vol 139 (6) ◽  
Author(s):  
Qingzhen Lu ◽  
Zhixun Yang ◽  
Jun Yan ◽  
Hailong Lu ◽  
Jinlong Chen ◽  
...  
Keyword(s):  
Finite Element ◽  
Analytical Model ◽  
Three Dimensional ◽  
Friction Stress ◽  
Element Model ◽  
Steel Tube ◽  
Fe Model ◽  
Bending Stress ◽  
3D Finite Element ◽  
Bending Behavior

Umbilical is an important equipment in the subsea production to supply a connection between the floater and the subsea well. Analyzing strength and fatigue behaviors under bending is a key requirement to assure safety. An analytical model is proposed for predicting the bending behavior of a steel tube wounded helically around a frictionless cylinder. A full three-dimensional (3D) finite element (FE) model of an umbilical is developed by considering the frictions and contacts among its components. The numerical results of the bending stress of a steel tube were validated against that of the analytical model. The impacts of friction coefficients on the bending stress, contact pressure, and friction stress have been further investigated by the established FE model.

Flow Stress Determination of Steel Tube for Hydroformability Evaluation

2012 ◽  
Vol 622-623 ◽  
pp. 656-660
Author(s):  
P. Boonpuek ◽  
S. Jirathearanat ◽  
N. Depaiwa
Keyword(s):  
Flow Stress ◽  
Analytical Model ◽  
Effective Stress ◽  
Steel Tube ◽  
Bulge Test ◽  
Stress Strain ◽  
Contact Points ◽  
Hydraulic Bulge Test ◽  
Hydraulic Bulge ◽  
Internal Pressures

This study aims to determine flow stress of a steel tube by using hydraulic bulge test. A new proposed analytical model for analyzing bulge shapes of hydroformed tubes is postulated. Bulge test apparatus designed using FEA simulation of hydroforming and STKM 11A steel tubes are used in the hydraulic bulge test. Bulge heights and internal pressures are measured during bulge testing. Tube thicknesses at vertex of a bulge shape are measured by a dial caliper gauge. Bulge curvatures and contact points are measured by taking digital photos of bulge shapes combined with measurement methods in CAD software. Effective stress - strain relationships are obtained from the newly developed analytical model using those measured values. Flow stress curves obtained from the effective stress – strain relationships are compared with those by other researchers and tensile test. Finite element analysis methods are used to conduct simulation of tube hydroforming using the flow stress curves. Predicted internal pressures versus bulge heights and tube thicknesses are compared with experimental results. Verification of the developed analytical model is presented. The flow stress at neck point of formed tube is determined.

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