Finite element approach in the plate bending process

Math, Miljenko; Grizelj, Branko

doi:10.1016/s0924-0136(02)00391-6

Cited by 16 publications

(9 citation statements)

References 2 publications

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“…He conducted several springback reduction techniques, such as over bending, stretching, arc bottoming, pinching die, spanking and movement (double bend) techniques. MATH et al [10] reported springback and residual stresses of bent plates, which was designed to assemble spherical tanks made of steel, using elastic-plastic incremental FE calculations and experimental validation. BAI et al [11] established the numerical model of power spinning of thin-walled aluminum alloy shell with hoop inner rib and gave a reasonable aid for designing mandrel according to the results of springback prediction.…”

Section: Introductionmentioning

confidence: 99%

Improvement of springback prediction of wide sheet metal air bending process

Zhao

Sun

et al. 2008

J. Cent. South Univ. Technol.

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Accurate springback prediction of wide sheet metal air bending process is important to improve product quality and ensure the precision in dimension. The definition of elastic limit bend angle was proposed. Based on cantilever beam elastic deforming theory, the geometrical parameters of forming tools, sheet thickness and the material yielding strain were derived and validated by the finite element method (FEM). Employing the degree of elastic limit bend angle, the equation for springback prediction was constructed, the results calculated fit well with experimental data. Especially for the small bend angle, the predicted results by equation were applied to conduct the springback prediction and compensation in industries and give closer correlation to the experimental data than those calculated by engineering theory of plastic bending.

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Section: Introductionmentioning

confidence: 99%

Improvement of springback prediction of wide sheet metal air bending process

Zhao

Sun

et al. 2008

J. Cent. South Univ. Technol.

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“…Any subsequent displacement of the punch from minimal load condition increases the load steeply. In the literature, some times, it is referred to as 'overstress' or 'overloading' condition 7 . The springback is characterized in terms of change in radius of the bent sheet with respect to die radius.…”

Section: Numerical Simulation Of Sheet Metal Bendingmentioning

confidence: 99%

Study of effect of load on springback in sheet metal bending

Panthi

Ramakrishnan

Gupta

et al. 2008

Trans Indian Inst Met

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for inertial effects in the FEM of sheet metal forming process. Papeleux and Ponthot 5 discussed numerically the effect of blank holder force, friction etc. on the forming response. Chou and Hung 6 carried out FEM of several springback reduction techniques such as over bending, stretching, arc bottoming, pinching die, spanking and movement (double bend) techniques, used in 'U' channel bending. Math and Grizelj 7 reported springback and residual stresses of bent plates designed for assembling spherical tanks made of steel using elastic-plastic incremental FE calculations. Esat et al. 8 carried out springback analysis of different aluminum sheets with different thicknesses and FEM results were compared with empirical ones. Lei et al. 9 analyzed the free bending and square cup deep drawing to predict the springback, stress distribution etc. for stainless steel with FEM.In this investigation, an elasto-plastic analysis of sheet metal bending process was carried out using experiments to predict the springback and substantiated with FEM. The main feature of this study is to investigate the influence of load on the springback pertaining to arc type sheet bending. The experimental data on aluminum, copper, brass and mild steel sheets were presented and results were compared with FEM ones, which shows a reasonable agreement. SHEET BENDING EXPERIMENTA standard 400 tonne hydraulic press was used to carry out the experiment of sheet metal bending process. It has two parallel platens of tungsten carbide with facilities for measuring loads, displacements as well as the speed of the platen. Figure 1 shows the setup of bending process with the ABSTRACT Springback remains a major concern in sheet metal bending in fabricating any final product within the permissible tolerance. Apart from the geometrical and material parameters, springback is significantly affected by the forming load also and the present study is focused on it. Sheet metal bending process involves large rotation and strain as well as large springback due to elastic recovery of the material. Therefore, a large deformation algorithm based Finite Element software was used to model a typical sheet metal bending process employed in manufacturing cylindrical structures. A Total-ElasticIncremental-Plastic (TEIP) algorithm has been incorporated in an in-house software to handle large deformation and the elastic recovery during the unloading process. In addition, experiments have been performed on aluminum, brass, copper and mild steel sheets and substantiated with the FEM analysis.

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“…Using computers in solving the equations, besides saving time and cost, has enhanced results verifiability and reliability. The equation solving of circular plates [10] and employment of the finite element techniques [11] for verification of some previously gained results [12] was an important step towards the upcoming new studies in this field. The ability of analyzing various thin walled structures with different shapes and loads, easy access to large database, and their ability to give better secondary parameters, has further developed the application of computers in analyzing these structures.…”

Section: Introductionmentioning

confidence: 99%

Experiments on the bending failure of diagonally stiffened circular plates

Modarresi

Showkati

2011

Materialwissenschaft Werkst

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In this paper, the bending behavior of circular steel plates with diagonal stiffeners has been studied. A bending analysis of the circular plates with different diagonal stiffeners has been carried out experimentally in order to predict their ultimate bending capacity. Two types of shallow and deep stiffeners of reverse L and rectangular cross sections were installed to strengthen the plates. In the experiments, both simply-supported and clamped-edge boundary conditions were set up under the effect of lateral pressure. The obtained experimental results have been verified by a non-linear analysis of the stiffened circular plates using the finite element method (FEM). The analytical process has been carried out based on the tensile test data of the steel used in the specimens. Furthermore, the post-buckling behavior of the plates has been studied up to the final flexural collapse, where unusual rupture results have been found. Different studies have shown a good consistency between experimental and analytical results.

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Finite element approach in the plate bending process

Cited by 16 publications

References 2 publications

Improvement of springback prediction of wide sheet metal air bending process

Improvement of springback prediction of wide sheet metal air bending process

Study of effect of load on springback in sheet metal bending

Experiments on the bending failure of diagonally stiffened circular plates

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