scholarly journals RETRACTED ARTICLE: Finite element simulation of material flow in friction stir process of nylon 6 and nylon 6/MWCNTs composite

2015 ◽  
Vol 2 (1) ◽  
pp. 1-24 ◽  
Author(s):  
Reza Farshbaf Zinati ◽  
Zude Zhou
Keyword(s):  
Finite Element ◽  
Finite Element Simulation ◽  
Material Flow ◽  
Nylon 6 ◽  
Friction Stir Process ◽  
Friction Stir ◽  
Element Simulation ◽  
Retracted Article

Material Flow Estimation of Deep-Drawn Product by Using Finite-Element Simulation

2011 ◽  
Vol 301-303 ◽  
pp. 452-455 ◽  
Author(s):  
Yuji Kotani ◽  
Hisaki Watari ◽  
Akihiro Watanabe
Keyword(s):  
Numerical Simulation ◽  
Finite Element ◽  
Finite Element Simulation ◽  
Material Flow ◽  
Thickness Distribution ◽  
Sheet Thickness ◽  
Original Material ◽  
Element Simulation ◽  
Thickness Prediction ◽  
Simulation And Evaluation

The approach to total weight reduction has been a key issue for car manufacturers as they cope with more and more stringent requirements for fuel economy. In sheet metal forming, local increases in product-sheet thickness effectively contribute to reducing the total product weight. Products could be designed more efficiently if a designer could predict and control the thickness distribution of formed products. This paper describes a numerical simulation and evaluation of the material flow in local thickness increments of products formed by an ironing process. In order to clarify the mechanism of the local increase in sheet thickness, a 3-D numerical simulation of deep drawing and ironing was performed using finite-element simulation. The effects of various types of finite elements that primarily affect thickness changes in original materials and thickness prediction were investigated. It was found that the sheet-thickness distribution could be predicted if the original material was relatively thick and if an appropriate type of finite element is selected.

The investigation into vibration effect on microstructure and mechanical characteristics of friction stir spot vibration welded aluminum: Simulation and experiment

2020 ◽  
Vol 234 (9) ◽  
pp. 1809-1822 ◽  
Author(s):  
Behrouz Bagheri ◽  
Mahmoud Abbasi ◽  
Reza Hamzeloo
Keyword(s):  
Residual Stress ◽  
Finite Element ◽  
Shear Strength ◽  
Finite Element Simulation ◽  
Stir Zone ◽  
Tensile Shear Strength ◽  
Tensile Shear ◽  
Friction Stir ◽  
Element Simulation ◽  
Workpiece Vibration

In this study, an innovative technique is employed to modify the microstructure and increase the mechanical characteristics of the Al5083 joint made by friction stir spot welding (FSSW). In this technique entitled FSSVW (friction stir spot vibration welding), the workpiece is vibrated during FSSW. Noted processes were modeled and finite element simulation results were also analyzed. The results showed that workpiece vibration during FSSW led to grain refinement, larger weld region, and improvement of the mechanical properties, namely tensile shear strength and hardness, of the joint. Stir zone grain size decreased by about 25% and tensile shear strength value increased by about 20% by applying workpiece vibration during FSSW. The results also indicated that the tensile shear strength and hardness enhanced, as vibration frequency increased. It was concluded that the presence of vibration increased the material deformation in the stir zone and led to enhanced deformation of the material. This intensified the dynamic recrystallization and resulted in grain refinement. It was also found that tensile residual stresses developed in the stir zone of FSS and FSSV welded specimens and tensile residual stress values for FSSV welded specimens were higher than those for FSS welded specimens for about 10%. It was concluded that the effect of grain size on hardness is higher than the effect of residual stress. Higher ductility is predicted for FSSV welded specimen with higher vibration frequency and also for specimen welded with less dwell time; finite element simulation was also applied to analyze the effects of workpiece vibration during FSSW on strain distribution as well as hardness and residual stress distribution within the joint during FSSW and FSSVW processes. Finite element simulation results had good compatibility with experimental results. It was concluded that the strain values and flow velocity relating to the FSSVW process are higher than those relating to the FSSW process.

Optimization of Drawbeads for Springback Based on RSM and NSGA-II

2010 ◽  
Vol 154-155 ◽  
pp. 902-906
Author(s):  
Lei Cheng ◽  
Wei Zhang ◽  
Bao Chun Lu ◽  
Hui Jun Gong ◽  
Yong Zheng Song
Keyword(s):  
Finite Element ◽  
Finite Element Simulation ◽  
Material Flow ◽  
Optimal Parameters ◽  
Nsga Ii ◽  
Surface Method ◽  
Element Simulation ◽  
Study Case ◽  
Springback Prediction ◽  
Orthogonal Tests

To improve material flow of sheet metal, draw beads are used to prevent wrinkling and springback during deep drawing process. Firstly, taking BenchMark2 "S-Rail-08" of NUMSIHEET’2008 as a study case, based on the orthogonal tests of finite element simulation of stamping process, a springback prediction model which adopts response surface method (RSM) was proposed to predict the springback influenced by draw beads parameters approximately. Then, in order to reduce springback, non-dominated sorting genetic algorithm (NSGA-II), is implemented to inverse and optimize both geometry and layout parameters of draw beads cost-efficiently. Finally, the validation of optimal parameters set and the feasible of this optimize approach are confirmed by finite element simulation of S-Rail springback.

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