Informatics Publishing Limited

R. Ramadoss ¹, A. Rajadurai ¹, S. Venugopal ², S. Satishkumar ³

Affiliations
1 Department of Production Technology, Madras Institute of Technology, Chrompet, Anna University, Chennai-600044, IN
2 Metal Forming and Tribology Section, Indira Gandhi Center for Atomic Research, Kalpakkam, IN
3 Department of Mechanical Engineering, St. Joseph’s College of Engineering, Chennai-600119, IN

Abstract

Austenitic stainless steels are special grades of steels with improved corrosion resistance and oxidation resistance. In this work forming limit diagrams (FLDs) for Austenitic stainless steels of grades AISI 316 and 316L of thickness 1.25mm have been studied and their suitability for forming applications have been examined. FLDs were experimentally found using the hemispherical punch forming test. The micro structural aspects, tensile properties, formability parameters of the above mentioned steels were studied and compared. The fracture surfaces of the formed samples were viewed using the scanning electron microscope (SEM) and the SEM images were correlated with the fracture behavior and formability of the sheet metal. It was found that the formability of AISI 316L posses good drawability and stretchability.

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R. Ramadoss ¹, A. Rajadurai ²

Affiliations
1 Department of Mechanical Engg., St.Joseph’s College of Engg., Chennai, IN
2 Dept. of Production Technology, Madras Institute of Technology Chrompet, Anna University, Chennai, IN

Abstract

Many of the stainless steel components ore manufactured through forming. Therefore on understanding of formability sheet metal is essential for successful prediction of quality stomping. In the present work, the forming limit of AISI 316LN stainless steel has been evaluated using the hemispherical punch forming test. The experimental forming limit diagram is compared with theoretical models of Swift, Hill and Sing Roo for validation. Sheet metal forming simulation was performed using the finite element software. The solution methodology was based on explicit time integration. A failure criterion has been introduced based on localized necking for the prediction of forming limit. The finite element predictions seem to be in good correlation with experimental results of AISI 316LN stainless steel. An error analysis on the FE-predictions was performed and the percentage deviation was found to vary between 0.28 and 12.24%. Theoretical models ore not predicting well with the experimental forming limit diagram.

Keywords

Hemispherical Punch Forming, Finite Element Simulation, Theoretical Model, Stainless Steel, Forming Limit Diagram.

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