Experimental and numerical investigating of distribution of thickness, drawing depth and forming limit diagram of steel sheet using Nakazima test

Authors

1 Faculty of Mechanics K.N.Toosi University

2 K.N.Toosi university

3 Associate Professor, Faculty of Mechanical Engineering, K. N. Toosi University of Technology

Abstract

In this article, the mechanical properties of stainless steel are measured at different strain rates. Then, considering the Swift work-hardness equation, the forming limit diagram (FLD) of the sheet has been obtained with two experimental and finite element methods. After designing the experiment based on Box-Behnken method and performing them using the finite element method (FEM), the effect of the input parameters of the radius of the die opening, the distance between the punch and the die, the force of the plate holder, the cutting direction of the primary blank relative to the rolling direction and the coefficient of friction has been obtained on the depth of the product without tearing. Finally, the optimal parameters to achieve the maximum stretching depth have been extracted. After defining the properties extracted from the steel sheet in the software, in order to validate and ensure the accuracy of the finite element analysis, the thickness distribution in a certain path on the experimental product has been compared with the finite element. After designing the experiments and conducting them using the FEM, it was found that in the investigated range, the clearance between the punch and the die has no effect on the depth of tension; Also, by increasing the radius of the opening of the die, the depth of stretching increases. The coefficient of friction has the greatest effect on the depth of stretching and with its decrease, the depth of stretching increases.

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References

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Journal of Solid and Fluid Mechanics
Volume 14, Issue 2
May and June 2024
Pages 139-153

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