Volume 17, Issue 10 (1-2018)                   Modares Mechanical Engineering 2018, 17(10): 333-340 | Back to browse issues page

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Shojaei S, Hashemi R, rahmatabadi D. Survey the effect of forming speed on fld for Al 6061 sheets. Modares Mechanical Engineering. 2018; 17 (10) :333-340
URL: http://mme.modares.ac.ir/article-15-1965-en.html
1- School of Mechanical Engineering, Iran University of Science and Technology, Tehran, Iran
2- Assistant professor / Iran University of Technology
Abstract:   (6364 Views)
FLDs, in fact are the range of strain combinations which identify the beginning of local necking. Different parameters such as sheet thickness, structural defects, temperature, loading direction, forming speed and etc. have influence on these diagrams and one of the most effective parameters is forming speed and it has a direct connection with press speed in sheet forming. In this research FLD are calculated for aluminum 6061 sheets with 3mm thickness in rates of 20, 100 and 200 mm/min experimentally and simulated in the rates of 20, 100, 200, 500 and 800mm/min. In order to do the experimental tests, bulge test is conducted in sheets in six different sizes according to standard by hydraulic press and built steel die. Also numerical modeling was done using the Abaqus finite element software and the maximum strain gauge criterion by entering the Johnson Cook data. Experimental and modelling results verify is studied by surveying the tearing location and errors between FLDs and result showed that experimental and numerical data are compatible with acceptable errors. It was observed that by increasing forming speed FLD increases, in a way that by increasing the press speed from 20 mm/min to 200 mm/min, FLD increases for 30 percentage. This variation can have different reasons such as friction effect and interaction effects between die and sheets, because at the low forming speed (of less than 100 1/s for strain rate) and at the room temperature, the effect of strain rate and mass inertia are minimal.
Keywords: Strain rate, FLD, Al 6061
Full-Text [PDF 1159 kb]   (3664 Downloads)    
Article Type: Research Article | Subject: Metal Forming
Received: 2017/07/12 | Accepted: 2017/09/19 | Published: 2017/10/27

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