Detonation forming of aluminium cylindrical cups experimental and theoretical modelling

Yaşar, Mustafa; Demirci, Halil İbrahim; Kadi, Ibrahim

doi:10.1016/j.matdes.2004.11.005

Cited by 20 publications

(6 citation statements)

References 4 publications

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“…In the literature, the thickness distribution has been studied using finite element models; however, experimental loading rates were not considered, and smooth variations of the thickness were observed [12,13]. In this work, an experimental loading rate was considered, and the simulations were competent to predict the experimental thickness variation pattern.…”

Section: Thickness Variationmentioning

confidence: 99%

Experimental and Numerical Studies of Sheet Metal Forming with Damage Using Gas Detonation Process

Patil

Prajapati

Jenkouk

et al. 2017

Metals

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Abstract:Gas detonation forming is a high-speed forming method, which has the potential to form complex geometries, including sharp angles and undercuts, in a very short process time. Despite many efforts being made to develop detonation forming, many important aspects remain unclear and have not been studied experimentally, nor numerically in detail, e.g., the ability to produce sharp corners, the effect of peak load on deformation and damage location and its propagation in the workpiece. In the present work, DC04 steel cups were formed using gas detonation forming, and finite element method (FEM) simulations of the cup forming process were performed. The simulations on 3D computational models were carried out with explicit dynamic analysis using the Johnson-Cook material model. The results obtained in the simulations were in good agreement with the experimental observations, e.g., deformed shape and thickness distribution. Moreover, the proposed computational model was capable of predicting the damage initiation and evolution correctly, which was mainly due to the high-pressure magnitude or an initial offset of the workpiece in the experiments.

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Section: Thickness Variationmentioning

confidence: 99%

Experimental and Numerical Studies of Sheet Metal Forming with Damage Using Gas Detonation Process

Patil

Prajapati

Jenkouk

et al. 2017

Metals

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“…The large number of parameters involved in forming and their interdependence makes the process more complex. These subjects have been studied in [1][2][3][4][5][6] with different perspectives. The parameters are material properties, machine parameters such as tool and die geometry, work piece geometry and working conditions.…”

Section: Forming Process Overviewmentioning

confidence: 99%

Some Studies on Forming Optimization with Genetic Algorithm

Kakandikar

Nandedkar²

2012

Int. J. Optim. Control, Theor. Appl. (IJOCTA)

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Abstract.Forming is a compression-tension process involving wide spectrum of operations and flow conditions. The result of the process depends on the large number of parameters and their interdependence. The selection of various parameters is still based on trial and error methods. In this paper the authors present a new approach to optimize the geometry parameters of circular components, process parameters such as blank holder pressure and coefficient of friction etc. The optimization problem has been formulated with the objective of optimizing the maximum forming load required in Forming. Genetic algorithm is used as a tool for the optimization: to optimize the drawing load and to optimize the process parameters. A finite element analysis simulation software Fast Form Advanced is used for the validations of the results after optimization with prior results.

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“…Later on in 2006, Yasar and his colleagues designed and fabricated a double‐stage gas mixture detonation forming apparatus in the University of Zonguldak Karaelmas in order to study die forming of a cylindrical cup made of aluminium alloy sheets. Acetylene (C 2 H 2 ) and oxygen (O 2 ) were combined in an equal volume ratio and have been applied as reactants in the combustion chamber.…”

Section: Introductionmentioning

confidence: 99%

Experimental and theoretical study on large ductile transverse deformations of rectangular plates subjected to shock load due to gas mixture detonation

Mostofi

Babaei

Alitavoli

2017

Strain

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The main purpose of this study is to show that metal plate forming by direct application of gas mixture detonation loads can be considered as an alternative high‐velocity forming method for structures instead of a conventional one. Therefore, in this investigation, a series of experimental tests have been conducted on aluminium alloy and mild steel plates with different thicknesses to examine large ductile transverse deformations of rectangular plates with clamped edge conditions subjected to gas mixture detonation loading. The main aim of the experimental section is to investigate the effects of predetonation pressures of acetylene (C2H2) and oxygen (O2) gasses and different mixture ratios on the dynamic response of specimens. The permanent deflections of plates have widely varied from 21.66 up to 56.31 mm. In theoretical analysis, according to an upper bound solution and energy method, theoretical models have been presented by assuming a zero‐order Bessel function of the first kind in the x and y directions for a transverse displacement profile to predict permanent deflections. To account for material strain rate sensitivity, a Cowper–Symonds model has been used, whereas the material coefficients of this equation are constant values or functions of plate thickness. A comparison of the present models with Jones' theoretical model shows that a good agreement with experimental results can be obtained when constant values are used for material coefficients in the Cowper–Symonds equation.

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Detonation forming of aluminium cylindrical cups experimental and theoretical modelling

Cited by 20 publications

References 4 publications

Experimental and Numerical Studies of Sheet Metal Forming with Damage Using Gas Detonation Process

Experimental and Numerical Studies of Sheet Metal Forming with Damage Using Gas Detonation Process

Some Studies on Forming Optimization with Genetic Algorithm

Experimental and theoretical study on large ductile transverse deformations of rectangular plates subjected to shock load due to gas mixture detonation

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