scholarly journals A recommendation of computation of normal streeses in single point incremental forming technology

2014 ◽  
Vol 17 (1) ◽  
pp. 21-28
Author(s):  
Dien Khanh Le ◽  
Nam Thanh Nguyen ◽  
Binh Thien Nguyen
Keyword(s):  
Finite Element Method ◽  
Finite Element ◽  
Incremental Forming ◽  
Single Point ◽  
Finite Element Method Simulation ◽  
Recent Decade ◽  
Work Piece ◽  
Single Point Incremental Forming ◽  
Forming Technology ◽  
Element Method

Single Point Incremental Forming (SPIF) has become popular for metal sheet forming technology in industry in many advanced countries. In the recent decade, there were lots of related studies that have concentrated on this new technology by Finite Element Method as well as by empirical practice. There have had very rare studies by pure analytical theory and almost all these researches were based on the formula of ISEKI. However, we consider that this formula does not reflect yet the mechanics of destruction of the sheet work piece as well as the behavior of the sheet in reality. The main aim of this paper is to examine ISEKI’s formula and to suggest a new analytical computation of three elements of stresses at any random point on the sheet work piece. The suggested formula is carefully verified by the results of Finite Element Method simulation.

Three-dimensional finite element method simulation of sheet metal single-point incremental forming and the deformation pattern analysis

2008 ◽  
Vol 222 (3) ◽  
pp. 373-380 ◽  
Author(s):  
L-W Ma ◽  
J-H Mo
Keyword(s):  
Finite Element Method ◽  
Finite Element ◽  
Sheet Metal ◽  
Incremental Forming ◽  
Single Point ◽  
Three Dimensional ◽  
Single Point Incremental Forming ◽  
Fem Model ◽  
Truncated Pyramid ◽  
Element Method

Further research of the sheet metal single-point incremental forming (SPIF), which is a flexible sheet metal numerical forming method without dedicated dies, has used finite element method (FEM) simulation to analyse the forming principle and the effect of process parameters on the forming. In SPIF, the located region of the blank in contact with the forming tool is formed incrementally along the trajectory. There is no symmetric load and geometry condition, so the FEM model could not be simplified to a symmetrical model and the efficiency of simulation is bad. In this paper, brick elements are used to establish the whole three-dimensional FEM model and a simplified three-dimensional FEM model of a truncated cone and truncated pyramid. Comparison of the simulation results from the two models indicates that both models fit the simulation of SPIF but the simplified model is more efficient. Therefore, based on the simplified FEM model of a truncated pyramid, the SPIF process with different parameters was simulated to study the incremental forming principle. It was found that the deformed blank could be divided into three regions with different deformation patterns and the main character of the deformation could be conceded as a combination of bending and stretching.

Analytical Computing Stresses and Strains in Single Point Incremental Forming

2019 ◽  
Vol 825 ◽  
pp. 129-139
Author(s):  
Le Khanh Dien ◽  
Le Khanh Tan ◽  
Van Thanh Nguyen ◽  
Huy Bich Nguyen ◽  
Thanh Nam Nguyen
Keyword(s):  
Incremental Forming ◽  
New Technology ◽  
Single Point ◽  
Fem Simulation ◽  
Recent Decade ◽  
Analytical Framework ◽  
Single Point Incremental Forming ◽  
Normal Stresses ◽  
Forming Technology ◽  
Almost All

Nowadays, Single Point Incremental Forming (SPIF) has become popular for metal sheet forming technology in industry in many advanced countries. In the recent decade, many relative studies have concentrated on this new technology of forming sheet by Finite Element Method (FEM) as well as by empirical way. There were very rare studies by pure analytical computing and P.A.F. Martins et al. under a title “Theory of single point incremental forming” performed almost all these researches were based on the analytical framework of SPIF in 2008. After careful studying on this research, we found out its light illogical result: the stresses inside of a random point in the workpiece sheet are constant and not related to the coordinate of the formed point of the sheet. Therefore, it cannot explain the mechanism of rupture and tear of the sheet that is really a serious restriction of the SPIF technology nowadays. This paper dedicates to suggest a new version of pure analytical computing the normal stresses at a random formed point in the sheet that could explain the tear mechanism and a FEM simulation was also carried out also to prove the conviction of the recommended formula.

Metal Forming and the Finite-Element Method

1989 ◽  
Author(s):  
Shiro Kobayashi ◽  
Soo-Ik Oh ◽  
Taylan Altan
Keyword(s):  
Finite Element Method ◽  
Finite Element ◽  
Metal Forming ◽  
Computer Aided Design ◽  
The Finite Element Method ◽  
Forming Technology ◽  
Computer Aided ◽  
Deformation Mechanics ◽  
Aided Design ◽  
Element Method

The application of computer-aided design and manufacturing techniques is becoming essential in modern metal-forming technology. Thus process modeling for the determination of deformation mechanics has been a major concern in research . In light of these developments, the finite element method--a technique by which an object is decomposed into pieces and treated as isolated, interacting sections--has steadily assumed increased importance. This volume addresses advances in modern metal-forming technology, computer-aided design and engineering, and the finite element method.

scholarly journals Finite Element Method modeling of Additive Manufactured Compressor Wheel

2021 ◽  
Author(s):  
Márton Tamás Birosz ◽  
Mátyás Andó ◽  
Sudhanraj Jeganmohan
Keyword(s):  
Finite Element Method ◽  
Finite Element ◽  
Finite Element Method Simulation ◽  
Element Model ◽  
Tensile Tests ◽  
Raw Material ◽  
Isotropic Hardening ◽  
Compressor Wheel ◽  
Material Extrusion ◽  
Element Method

AbstractDesigning components is a complex task, which depends on the component function, the raw material, and the production technology. In the case of rotating parts with higher RPM, the creep and orientation are essential material properties. The PLA components made with the material extrusion process are more resistant than VeroWhite (material jetting) and behave similarly to weakly cross-linked elastomers. Also, based on the tensile tests, Young’s modulus shows minimal anisotropy. Multilinear isotropic hardening and modified time hardening models are used to create the finite element model. Based on the measurements, the finite element method simulation was identified. The deformation in the compressor wheel during rotation became definable. It was concluded that the strain of the compressor wheel manufactured with material extrusion technology is not significant.

Application of hierarchical cascading technique to finite element method simulation in bulk acoustic wave devices

2018 ◽  
Vol 57 (7S1) ◽  
pp. 07LC08 ◽  
Author(s):  
Xinyi Li ◽  
Jingfu Bao ◽  
Yulin Huang ◽  
Benfeng Zhang ◽  
Tatsuya Omori ◽  
...  
Keyword(s):  
Finite Element Method ◽  
Finite Element ◽  
Acoustic Wave ◽  
Finite Element Method Simulation ◽  
Bulk Acoustic Wave ◽  
Acoustic Wave Devices ◽  
Element Method

Optimization of Osteosynthesis Positioning in Mandibular Body Fracture Management using Numerical Finite Element Method Simulation and Polymeric Model Testing

2021 ◽  
Author(s):  
Omid Daqiq ◽  
Fred W. Wubs ◽  
Ruud R. M. Bos ◽  
Baucke van Minnen
Keyword(s):  
Finite Element Method ◽  
Finite Element ◽  
Mechanical Test ◽  
Body Height ◽  
Finite Element Method Simulation ◽  
Mechanical Tests ◽  
Body Fracture ◽  
Fracture Management ◽  
Mandibular Body ◽  
Element Method

Abstract The study aims to optimise surgical management for mandibular body fractures by application of finite element method (FEM) with verification from polymeric model tests. The study investigates two issues regarding the application of osteosynthesis plates for mandibular body fractures: the effect of miniplate positioning and mandibular body height decrease. Computed tomography (CT) images of cadaveric mandibles with heights of resp. 21, 15, and 10 mm were used to create a FEM-model with a unilateral straight-line fracture, fixated with a standard commercially available 6-hole 2 mm titanium miniplate. Outcomes were compared with a series of mechanical tests with polymeric models fixed in a customized device and loaded with a mechanical test bench. Firstly, the study illustrates that the optimal plate position appears to be the upper border. Secondly, lower mandibular height increases instability and requires a stronger fixation. Thirdly, optimal fracture reduction is essential for gaining stability. In conclusion, FEM and polymeric testing outcomes of unilateral non-comminuted fractures were highly comparable to the current opinions in mandibular fracture treatment. In future, the FEM may be used to predict the treatment of more complex fractures. However, more analysis needs to be conducted to say whether FEM alone is sufficient for fracture analysis.

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