A non-associated anisotropic plasticity model with mixed isotropic–kinematic hardening for finite element simulation of incremental sheet metal forming process

2018 ◽  
Vol 100 (1-4) ◽  
pp. 929-940 ◽  
Author(s):  
Abir Bouhamed ◽  
Hanen Jrad ◽  
Lotfi Ben Said ◽  
Mondher Wali ◽  
Fakhreddine Dammak
Keyword(s):  
Finite Element ◽  
Sheet Metal Forming ◽  
Metal Forming ◽  
Kinematic Hardening ◽  
Plasticity Model ◽  
Forming Process ◽  
Anisotropic Plasticity ◽  
Element Simulation ◽  
Incremental Sheet Metal Forming ◽  
Metal Forming Process

The Simulation of Robot Based Incremental Sheet Metal Forming by Means of a New Solid-Shell Finite Element Technology and a Finite Elastoplastic Model with Combined Hardening

2011 ◽  
Vol 473 ◽  
pp. 875-880 ◽  
Author(s):  
Yalin Kiliclar ◽  
Roman Laurischkat ◽  
Stefanie Reese ◽  
Horst Meier
Keyword(s):  
Finite Element ◽  
Sheet Metal ◽  
Sheet Metal Forming ◽  
Metal Forming ◽  
Kinematic Hardening ◽  
Industrial Robots ◽  
Solid Shell ◽  
Forming Process ◽  
Incremental Sheet Metal Forming ◽  
Shell Finite Element

The principle of robot based incremental sheet metal forming is based on flexible shaping by means of a freely programmable path-synchronous movement of two tools, which are operated by two industrial robots. The final shape is produced by the incremental infeed of the forming tool in depth direction and its movement along the geometry’s contour in lateral direction. The main problem during the forming process is the influence on the dimensional accuracy resulting from the compliance of the involved machine structures and the springback effects of the workpiece. The project aims to predict these deviations caused by resiliences and to carry out a compensative path planning based on this prediction. Therefore a planning tool is implemented which compensates the robot’s compliance and the springback effects of the sheet metal. Finite element analysis using a material model developed at the Institute of Applied Mechanics (IFAM) [1] has been used for the simulation of the forming process. The finite strain constitutive model combines nonlinear kinematic and isotropic hardening and is derived in a thermodynamical setting. It is based on the multiplicative split of the deformation gradient in the context of hyperelasticity. The kinematic hardening component represents a continuum extension of the classical rheological model of Armstrong–Frederick kinematic hardening which is widely adopted as capable of representing the above metal hardening effects. The major problem of low-order finite elements used to simulate thin sheet structures, such as used for the experiments, is locking, a non-physical stiffening effect. Recent research focuses on the large deformation version of a new eight-node solid-shell finite element based on reduced integration with hourglass stabilization. In the solid-shell formulation developed at IFAM ([2], [3]) the enhanced assumed strain (EAS) concept as well as the assumed natural strain (ANS) concept are implemented to circumvent locking. These tools are very important to obtain a good correlation between experiment and simulation.

scholarly journals Multi-objective finite element simulations of a sheet metal-forming process via a cloud-based platform

2018 ◽  
Vol 100 (9-12) ◽  
pp. 2753-2765 ◽  
Author(s):  
Ailing Wang ◽  
Omer El Fakir ◽  
Jun Liu ◽  
Qunli Zhang ◽  
Yang Zheng ◽  
...  
Keyword(s):  
Finite Element ◽  
Sheet Metal ◽  
Sheet Metal Forming ◽  
Metal Forming ◽  
Finite Element Simulations ◽  
Forming Process ◽  
Multi Objective ◽  
Metal Forming Process

scholarly journals FEM Investigation of Ductile Fracture Prediction in Two-Point Incremental Sheet Metal Forming process

2017 ◽  
Vol 207 ◽  
pp. 836-841 ◽  
Author(s):  
Chenhao Wang ◽  
William J.T. Daniel ◽  
Haibo Lu ◽  
Sheng Liu ◽  
Paul A. Meehan
Keyword(s):  
Ductile Fracture ◽  
Sheet Metal ◽  
Sheet Metal Forming ◽  
Metal Forming ◽  
Fracture Prediction ◽  
Forming Process ◽  
Incremental Sheet Metal Forming ◽  
Metal Forming Process
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