Experimental Investigation of the Formability Improvement of Brass 260 and Al5182-O in Various Strain Rate using Hydrodynamic and Electrohydraulic Forming Methods
Subject Areas : advanced manufacturing technology
َAmin
Ashrafi Tafreshi
1
(Department of Mechanical Engineering,
University of K.N.Toosi, Iran)
Mehdi
Zohoor
2
(Department of Mechanical Engineering,
University of K.N.Toosi, Iran)
Keywords: Formability, Nakazima Test, Electrohydraulic Forming Process (EHF), Hydrodynamic Forming Method, Forming Limit Diagrams (FLD),
Abstract :
Studying the formability of the sheet metals have been the subject of many researches during the last decades. A number of experimental and numerical approaches were implemented to derive the formability diagrams of different materials. In this study, the formability of two mostly used alloys, Brass 260 and Al5182-O as low and moderate formability materials, were investigated respectively. The forming limit diagrams of both materials were determined by using three experimental approaches such as Nakazima quasi-static as low strain rate method, hydrodynamic forming method as the moderate strain rate method and Electrohydraulic Forming process as high strain rate method. Three experimental results of forming limit diagram with the various strain rate were compared graphically. The results have shown that both of the materials could withstand higher strains when the electrohydraulic forming method was applied on the specimens and consequently, the forming limit diagrams for Brass 260 and Al5182-O shift up by 11% and 14%, respectively. In addition, it was concluded that the hydrodynamic forming method improves the formability of the materials by 4% and 6% for Brass 260 and Al5182-O, respectively. The outcomes of this study indicated that the formability of both materials was improved significantly by increasing the strain rate.
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