Study on Forming Mechanism of Bimetal-Pipe by External Hydraulic Contraction

2018 ◽  
Author(s):  
Quanzhao Sun ◽  
Guolai Yang ◽  
Jianli Ge ◽  
Baochun Lu ◽  
Yanming Song
Keyword(s):  
Finite Element ◽  
Elastic Recovery ◽  
Hydraulic Pressure ◽  
Forming Process ◽  
Element Analysis ◽  
Forming Mechanism ◽  
Upper Limits ◽  
Dimensional Finite Element ◽  
Good Agreement ◽  
Outer Pipe

It is widely known that a bimetal-pipe can be produced by internal hydraulic expansion. An inevitable limitation of which is that the elastic recovery of the outer pipe should be greater than that of the inner pipe when the forming pressure is released. And the existing techniques usually result in plastic deformation of the inner pipe. Considering the circumstance that elastic recovery of the inner pipe is greater than that of the outer pipe, or only elastic deformation in the inner pipe is allowed, an analytical model was developed to investigate the forming process of bimetal-pipes by external hydraulic contraction. The deformation compatibility condition of the bimetal-pipe was obtained according to the deformation rule. The formula relating the applied external hydraulic pressure and the residual contact pressure between the inner and the outer pipes was derived, and the lower and upper limits of the external hydraulic forming pressures were studied. A two-dimensional finite element analysis of the hydraulic contraction forming process of the bimetal-pipe was conducted. The comparison between the theoretical results and the finite element solutions shows that they are in good agreement. The presented methodology can be used in design and manufacturing of bimetal-pipes where the forming pressure should be applied on the outside surface.

Three-Dimensional Elastic-Plastic Finite-Element Analysis of the Flattening of Wire Between Plain Rolls*

2000 ◽  
Vol 123 (3) ◽  
pp. 397-404 ◽  
Author(s):  
H. Utsunomiya ◽  
P. Hartley ◽  
I. Pillinger
Keyword(s):  
Finite Element ◽  
Elastic Recovery ◽  
Three Dimensional ◽  
Lateral Spread ◽  
Radius Of Curvature ◽  
Forming Process ◽  
Empirical Formulas ◽  
Element Analysis ◽  
Finite Element Program ◽  
Elastic Plastic

It is normal industrial practice to roll round edged flat wires from round circular wires using plain rolls. Although this is not a complex type of metal forming process, the internal deformation is highly three-dimensional. It is important to be able to determine the lateral spread, elongation and final profile precisely. In this paper, this process has been analyzed using an elastic-plastic finite element program. Firstly, algorithms for integrating the constitutive equations, i.e., return mapping algorithms, are evaluated to determine the most accurate technique. Then, the influences of friction and reduction in thickness on the deformation characteristics are investigated. The lateral spread and the radius of curvature of the free surface are quantitatively in reasonable agreement with those obtained from empirical formulas. The lateral spread increases with friction and with reduction. The variation of elongation in the roll bite is investigated in detail. It is found that the elongation is not uniformly distributed across the cross section. After passing the roll gap, the distribution is compensated by the elastic recovery of wire, otherwise it may cause edge waves.

Three-Dimensional Finite Element Analysis on Open-Die Block Forging Design

1992 ◽  
Vol 114 (4) ◽  
pp. 459-464 ◽  
Author(s):  
Chinghua Hung ◽  
Shiro Kobayashi
Keyword(s):  
Finite Element ◽  
Three Dimensional ◽  
Rigid Plastic ◽  
Flat Bottom ◽  
Element Analysis ◽  
Dimensional Finite Element ◽  
Die Set ◽  
Cylindrical Workpiece ◽  
Three Dimensional Finite Element ◽  
Good Agreement

Three-dimensional rigid-plastic finite element method was used to analyze the practice of open-die block forging, focusing on the effects of die configurations and forging pass designs. Four combinations of die configurations were investigated: conventional flat dies, top flat/bottom V-shaped dies, and double V-shaped dies with 120 and 135 deg included angles. Two different pass designs, 90 and 180 deg rotation angles between succeeding passes, were applied to each die set. The results include the magnitude and distribution of effective strains along the center line of the cylindrical workpiece and the final shape of the workpiece. Good agreement was observed in comparison with experimental data from physical modeling method, and several suggestions were made for choosing suitable dies.

scholarly journals FINITE ELEMENT ANALYSIS OF SHADED POLE MOTOR BASED ON MAXWELL2D

2021 ◽  
Vol 25 (Special) ◽  
pp. 1-115-1-220
Author(s):  
Adnan J. Kazem ◽  
◽  
Amer M. Ali ◽  
Keyword(s):  
Finite Element Method ◽  
Finite Element Analysis ◽  
Finite Element ◽  
Induction Motor ◽  
Single Phase ◽  
Two Dimensional ◽  
Element Analysis ◽  
Analytical Results ◽  
Dimensional Finite Element ◽  
Good Agreement

Shaded pole induction motor is one of the simplest and least expensive types of single-phase motors, but one of the most difficult to analyze. In this paper, we adopted a two-dimensional finite element method 2DFEM, which is one of the most accurate methods to analyze such motors. We used Ansys Maxwell2D software with assist of AutoCAD software in modeling and analyzing a reluctance-augmented shaded pole motor. The 2DFEM results of torques and currents for this motor obtained from Maxwell2D were compared with the analytical results and appeared a good agreement.

Contact Stresses in Dovetail Attachments: Alleviation via Precision Crowning

2003 ◽  
Vol 125 (4) ◽  
pp. 1033-1041 ◽  
Author(s):  
G. B. Sinclair ◽  
N. G. Cormier
Keyword(s):  
Finite Element ◽  
Contact Stresses ◽  
Physical Models ◽  
Element Analysis ◽  
The Finite Element Analysis ◽  
Large Fluctuations ◽  
Dimensional Finite Element ◽  
Hoop Stresses ◽  
Good Agreement ◽  
Made In

Previous studies of contact stresses in dovetail attachments provide verified finite element stresses as well as some simple physical models of such stresses. Generally there is good agreement between the finite element analysis and the simple physical models. Together the two identify a pinching mechanism as leading to large fluctuations in hoop stresses at the edges of contact. These fluctuating hoop stresses can be expected to be a major contributor to the fatigue of dovetail attachments. The present study investigates a method of alleviating the fluctuating hoop stresses. This method entails crowning of the contacting flat on a blade. Such crowning is in two orthogonal directions on the blade flat. Two-dimensional finite element analyses are made in both directions. These analyses indicate that significant reductions in fluctuating hoop stresses can be achieved by the method, provided the crowning is controlled sufficiently precisely.

Contact Stresses in Dovetail Attachments: Alleviation via Precision Crowning

2001 ◽  
Author(s):  
G. B. Sinclair ◽  
N. G. Cormier
Keyword(s):  
Finite Element ◽  
Contact Stresses ◽  
Physical Models ◽  
Element Analysis ◽  
The Finite Element Analysis ◽  
Large Fluctuations ◽  
Dimensional Finite Element ◽  
Hoop Stresses ◽  
Good Agreement ◽  
Made In

Previous studies of contact stresses in dovetail attachments provide verified finite element stresses as well as some simple physical models of such stresses. Generally there is good agreement between the finite element analysis and the simple physical models. Together the two identify a pinching mechanism as leading to large fluctuations in hoop stresses at the edges of contact. These fluctuating hoop stresses can be expected to be a major contributor to the fatigue of dovetail attachments. The present study investigates a method of alleviating the fluctuating hoop stresses. This method entails crowning of the contacting flat on a blade. Such crowning is in two orthogonal directions on the blade flat. Two-dimensional finite element analyses are made in both directions. These analyses indicate that significant reductions in fluctuating hoop stresses can be achieved by the method, provided the crowning is controlled sufficiently precisely.

A Finite Element Analysis of Stress Fields in Vickers Indentation on Brittle Materials

2007 ◽  
Vol 329 ◽  
pp. 403-408 ◽  
Author(s):  
Bing Zhang ◽  
Masato Yoshioka
Keyword(s):  
Finite Element ◽  
Three Dimensional ◽  
Brittle Materials ◽  
Element Model ◽  
Time Dependent ◽  
Stress Fields ◽  
Element Analysis ◽  
Dimensional Finite Element ◽  
Three Dimensional Finite Element ◽  
Good Agreement

A three dimensional finite element model for Vickers indentations on brittle materials is presented in order to analyze the stress distribution. The objective of this paper is to study when and where cracks are most likely to initiate and propagate in the indentation cycle based on the analyzed stresses. Therefore the time-dependent stresses around and below the surface of the contact area during the indentation cycle, especially at the end of loading and at the beginning of unloading phase are investigated in detail. The analytical results are shown to be in good agreement and verified with the experimental results.

Finite Element Analysis of Energy Saving Jointing Method Base on Energy Materials: Clinching

2012 ◽  
Vol 577 ◽  
pp. 9-12 ◽  
Author(s):  
Jun Chao Zheng ◽  
Xiao Cong He ◽  
Jing Nan Xu ◽  
Kai Zeng ◽  
Yan Fang Ding ◽  
...  
Keyword(s):  
Finite Element ◽  
Energy Saving ◽  
Cost Effective ◽  
Quality Parameter ◽  
Energy Materials ◽  
Forming Process ◽  
Element Analysis ◽  
Neck Thickness ◽  
Environmentally Friendly Process ◽  
Good Agreement

The clinch joining technique can be used to join energy saving materials based on a cost effective, environmentally friendly process. In this paper, the mechanical joining method by clinching with segmented die is analyzed utilizing a finite element method. A comparison is conducted about the principle of forming process and the metal flowing direction for two different types of die, drawing conclusions that a better interlocking length can be obtained using segmented die. Analyzing the quality parameter of the clinching results, finds the reason why the segmented die can get a better neck thickness and undercut. Meanwhile, the results of clinching with segmented die also show a good agreement with experimental results.

Finite Element Analysis of Nonuniformity of Tires with Imperfections5

2007 ◽  
Vol 35 (3) ◽  
pp. 226-238 ◽  
Author(s):  
K. M. Jeong ◽  
K. W. Kim ◽  
H. G. Beom ◽  
J. U. Park
Keyword(s):  
Finite Element Analysis ◽  
Finite Element ◽  
Three Dimensional ◽  
Element Model ◽  
Radial Force ◽  
Element Analysis ◽  
The Finite Element Analysis ◽  
Dimensional Finite Element ◽  
Force Variation ◽  
Three Dimensional Finite Element

Abstract The effects of variations in stiffness and geometry on the nonuniformity of tires are investigated by using the finite element analysis. In order to evaluate tire uniformity, a three-dimensional finite element model of the tire with imperfections is developed. This paper considers how imperfections, such as variations in stiffness or geometry and run-out, contribute to detrimental effects on tire nonuniformity. It is found that the radial force variation of a tire with imperfections depends strongly on the geometrical variations of the tire.

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