Piecewise Fifth Order Spline Interpolation for Line Heating Forming Process

2016 ◽  
Author(s):  
Henri Champliaud ◽  
Zhengkun Feng ◽  
David Provencher ◽  
Danick Tousignant ◽  
Javad Gholipour
Keyword(s):  
Finite Element ◽  
Flat Plate ◽  
Spline Interpolation ◽  
Finite Element Simulations ◽  
Thermal Gradients ◽  
Interpolation Model ◽  
Forming Process ◽  
Line Heating ◽  
Order Spline ◽  
Fifth Order

A fifth order piecewise spline interpolation model has been developed for computing the evolving geometry of a plate deformed by line heating thermal gradients. 3D formulations are presented and applied to continuously derivable geometries to demonstrate the capability of the methodology. Then the developed formulation is used to form gradually, with a sequence of heating lines, a 3D shape from an initially flat plate. The geometric results obtained from finite element simulations with three heating lines are used to illustrate where heating lines should be applied on a flat plate to achieve the intended geometry of a workpiece. Furthermore, it is shown that applying the developed piecewise fifth order spline interpolation model to the same flat plate produces results very close to the ones obtained from the thermal structural FE simulations.

Finite Element Simulations Of Multi Stage Incremental Forming Process

2018 ◽  
Vol 5 (2) ◽  
pp. 3802-3810 ◽  
Author(s):  
Kurra Suresh ◽  
Srinivasa Prakash Regalla ◽  
Nitin Kotkundae
Keyword(s):  
Finite Element ◽  
Incremental Forming ◽  
Finite Element Simulations ◽  
Forming Process ◽  
Multi Stage

Finite element simulations of the doublediaphragm forming process

2005 ◽  
Vol 14 (6-7) ◽  
pp. 633-651 ◽  
Author(s):  
Xiaobo Yu ◽  
Lin Ye ◽  
Yiu-Wing Mai ◽  
Bruce Cartwright ◽  
Damian McGuckin ◽  
...  
Keyword(s):  
Finite Element ◽  
Finite Element Simulations ◽  
Forming Process

Study of Multi-Point Flexible Floating Clamping System of Multi-Roll Stretch Forming Process

2011 ◽  
Vol 291-294 ◽  
pp. 282-285 ◽  
Author(s):  
Hao Han Zhang ◽  
Ming Zhe Li ◽  
Wen Zhi Fu ◽  
Xue Chen
Keyword(s):  
Finite Element ◽  
Finite Element Simulations ◽  
Metal Sheet ◽  
Stretch Forming ◽  
Forming Process ◽  
Clamping System

Multi-Roll Stretch forming process is a new flexible process which is used for forming hyperbolic-degree surface pieces. Using the Multi-point flexible floating clamping system, the metal sheet can be more easily formed, and the flexibility can be much higher, which the ordinary floating clamping cannot have. A series of finite element simulations and experiments have been done for the process of forming saddle-shaped parts using Multi-Point flexible floating clamping system, and ordinary floating clamping system. The results show that the quality of the part formed using flexible floating clamping system is better.

Study of Multi-Roll Stretch Forming Process Using Different Clamps

2010 ◽  
Vol 44-47 ◽  
pp. 2752-2756 ◽  
Author(s):  
Hao Han Zhang ◽  
Ming Zhe Li ◽  
Wen Zhi Fu ◽  
Zhi Qing Hu
Keyword(s):  
Finite Element ◽  
Sheet Metal ◽  
Opposite Direction ◽  
Critical Value ◽  
Finite Element Simulations ◽  
Stretch Forming ◽  
Forming Process ◽  
Wave Type ◽  
Tooth Type ◽  
Formed Part

Multi-Roll Stretch Forming process is a new flexible process which is used in forming hyperbolic-degree surface pieces. A series of finite element simulations and experiments have done for the process of forming saddle-shaped parts using two kinds of clamps named Tooth-type clamp and Wave-type clamp. The results show that Wave-type clamp can control the stretching force at an appropriate value. When the stretching force exceeds a critical value, the sheet metal can flow to the opposite direction of Stretch Forming as to maintain that stretching force. The formed part using Wave-type clamp has a better quality than the parts formed using Tooth-type clamp.

Electromagnetic Sheet Bulging: Analysis of Process Parameters by FE Simulations

2013 ◽  
Vol 554-557 ◽  
pp. 741-748 ◽  
Author(s):  
Joao Pedro M. Correia ◽  
Saïd Ahzi
Keyword(s):  
Finite Element ◽  
Process Parameters ◽  
High Speed ◽  
Finite Element Simulations ◽  
Electromagnetic Forming ◽  
Forming Process ◽  
High Speed Forming ◽  
Bulging Test ◽  
High Repeatability

Electromagnetic forming is a non-conventional forming process and is classified as a high-speed forming process. It provides certain advantages as compared to conventional forming processes: improved formability, high repeatability and productivity, reduction in tooling cost and reduction of springback and of wrinkling. However, various process parameters affect the performance of the electromagnetic forming system. Finite element simulations are very useful to optimize a process because they can reduce time and costs. With the aim of investigating the effects of the process parameters on the deformed blank geometry, finite element simulations of an electromagnetic sheet bulging test have been performed in this work. Furthermore the role of first impulse of discharged current is also investigated.

Online Forecast of Fatigue Life in Welded Grider of Bridge Crane

2008 ◽  
Vol 44-46 ◽  
pp. 809-812
Author(s):  
Chang Hong Liu ◽  
Xin Tian Liu ◽  
Hu Huang ◽  
Li Hui Zhao
Keyword(s):  
Fatigue Crack ◽  
Crack Extension ◽  
Spline Interpolation ◽  
Fuzzy Reasoning ◽  
Bridge Crane ◽  
Ann Model ◽  
Interpolation Model ◽  
Anfis Model ◽  
Fatigue Crack Development ◽  
Order Spline

It is very important to forecast the fatigue crack development upon welded girder of bridge crane during use. When it happens, it will have a lot of clout with performance of enterprises. For security purpose in use, ANFIS model is built to predict the length of the fatigue crack extension about welded girder of bridge crane. Membership function is adjusted according to inputs and outputs of fuzzy reasoning, and appropriate fuzzy regulation numbers are chosen. The model which is closest to the real development of fatigue crack is built with the help of the If-Then rules. According to the result from the fatigue experiment of the welded girder of bridge crane, ANFIS model, ANN model and Three Order Spline Interpolation model are respectively built. After analysis and verification, it is obvious that ANFIS model is more accurate and feasible.

Effect of Residual Forming Stresses on Fracture in ERW Pipe

2016 ◽  
Author(s):  
Ted L. Anderson ◽  
Gregory W. Brown
Keyword(s):  
Heat Treatment ◽  
Residual Stress ◽  
Finite Element ◽  
Residual Stresses ◽  
Fracture Behavior ◽  
Finite Element Simulations ◽  
Finite Element Analyses ◽  
Forming Process ◽  
Cold Expansion ◽  
The Past

Many older pipelines contain significant residual stress due to the forming process. Cold expansion or a normalizing heat treatment can virtually eliminate residual forming stresses, but these practices were less common in the past. In the absence of cold expansion or normalization, residual forming stresses can be reduced by hydrostatic testing or operating pressures, but not eliminated entirely. Residual stresses can contribute to fracture in pipelines, particularly when the material toughness is low. This article presents a series of analyses that seek to quantify the magnitude of residual forming stresses as well as their impact on pipeline integrity. The pipe forming process was simulated with elastic-plastic finite element analyses, which considered the effect of subsequent loading on relaxation of residual stresses. A second set of finite element simulations were used to quantify the effect of residual stresses on fracture behavior.

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