Journal of Materials Processing Technology, Jan 1, 2000
The paper starts with a brief historical overview to the attempts of numerical simulation of shee... more The paper starts with a brief historical overview to the attempts of numerical simulation of sheet metal forming. Comparison between bulk and sheet metal forming processes from the simulation point of view is given. Basic requirements of the applier to the simulation tools are summarized. Various possible methodologies are brie¯y discussed. Special emphasis is given to the static explicit and dynamic implicit ®nite element procedures. Also different element types are overviewed. Available important commercial ®nite element packages are given. The current state of the application of the simulation tools is discussed. Some typical industrial applications are reviewed to demonstrate the current abilities of analysis. Finally, an attempt to prognosticate some future developments is made. #
A membrane theory formulation of a finite element method for modeling sheet metal forming process... more A membrane theory formulation of a finite element method for modeling sheet metal forming processes of general geometry is presented. The material characteristics are assumed to be rigid plastic, rate sensitive and isotropic hardening with flow rules obeying Hill's new yield ...
International Journal of Mechanical Sciences, Jan 1, 2000
In order to obtain competitiveness in the "eld of industrial manufacture, a reduction in the deve... more In order to obtain competitiveness in the "eld of industrial manufacture, a reduction in the development period for the small batch manufacture of products is required. In order to meet these requirements, an incremental sheet metal forming process has been developed. In this process, a small local region of a sheet blank deforms incrementally by moving a hemispherical head tool over an arbitrary surface. In this work, an incremental sheet metal forming process controlled three dimensionally by a computer has been accomplished. It has been shown by the experiments that a sheet blank is mainly subject to shear-dominant deformation. Therefore, the "nal thickness strain can be predicted. The uniformity of thickness throughout the deformed region is one of the key factors to improve the formability in the sheet metal forming processes. Using the predicted thickness strain distribution, the intermediate geometry is decided in the manner that a shear deformation is restrained in the highly shear-deformed region and vice versa. This double-pass forming method is found to be very e!ective so that the thickness strain distribution of a "nal shape can be made more uniform.
Journal of Materials Processing Technology, Jan 1, 2003
The idea of incremental forming technique has been investigated for production of sheet metal com... more The idea of incremental forming technique has been investigated for production of sheet metal components. With this technique, the forming limit curve (FLC) appears in a different pattern, revealing an enhanced formability, compared to conventional forming techniques. In the present study, the formability of an aluminum sheet under various forming conditions was assessed and difficult-to-form shapes were produced with the technique. By utilizing knowledge and experience obtained during the present study, it became possible to produce some free surfaces.
Journal of Materials Processing Technology, Jan 1, 2000
The paper starts with a brief historical overview to the attempts of numerical simulation of shee... more The paper starts with a brief historical overview to the attempts of numerical simulation of sheet metal forming. Comparison between bulk and sheet metal forming processes from the simulation point of view is given. Basic requirements of the applier to the simulation tools are summarized. Various possible methodologies are brie¯y discussed. Special emphasis is given to the static explicit and dynamic implicit ®nite element procedures. Also different element types are overviewed. Available important commercial ®nite element packages are given. The current state of the application of the simulation tools is discussed. Some typical industrial applications are reviewed to demonstrate the current abilities of analysis. Finally, an attempt to prognosticate some future developments is made. #
A membrane theory formulation of a finite element method for modeling sheet metal forming process... more A membrane theory formulation of a finite element method for modeling sheet metal forming processes of general geometry is presented. The material characteristics are assumed to be rigid plastic, rate sensitive and isotropic hardening with flow rules obeying Hill's new yield ...
International Journal of Mechanical Sciences, Jan 1, 2000
In order to obtain competitiveness in the "eld of industrial manufacture, a reduction in the deve... more In order to obtain competitiveness in the "eld of industrial manufacture, a reduction in the development period for the small batch manufacture of products is required. In order to meet these requirements, an incremental sheet metal forming process has been developed. In this process, a small local region of a sheet blank deforms incrementally by moving a hemispherical head tool over an arbitrary surface. In this work, an incremental sheet metal forming process controlled three dimensionally by a computer has been accomplished. It has been shown by the experiments that a sheet blank is mainly subject to shear-dominant deformation. Therefore, the "nal thickness strain can be predicted. The uniformity of thickness throughout the deformed region is one of the key factors to improve the formability in the sheet metal forming processes. Using the predicted thickness strain distribution, the intermediate geometry is decided in the manner that a shear deformation is restrained in the highly shear-deformed region and vice versa. This double-pass forming method is found to be very e!ective so that the thickness strain distribution of a "nal shape can be made more uniform.
Journal of Materials Processing Technology, Jan 1, 2003
The idea of incremental forming technique has been investigated for production of sheet metal com... more The idea of incremental forming technique has been investigated for production of sheet metal components. With this technique, the forming limit curve (FLC) appears in a different pattern, revealing an enhanced formability, compared to conventional forming techniques. In the present study, the formability of an aluminum sheet under various forming conditions was assessed and difficult-to-form shapes were produced with the technique. By utilizing knowledge and experience obtained during the present study, it became possible to produce some free surfaces.
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