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Computer-assisted engineering determination of the formability limit for thin sheet metals by a modified Marciniak method (CROSBI ID 151731)

Prilog u časopisu | izvorni znanstveni rad | međunarodna recenzija

Pepelnjak, Tomaž ; Barišić, Branimir Computer-assisted engineering determination of the formability limit for thin sheet metals by a modified Marciniak method // Journal of strain analysis for engineering design, 44 (2009), 6; 459-472. doi: 10.1243/03093247JSA503

Podaci o odgovornosti

Pepelnjak, Tomaž ; Barišić, Branimir

engleski

Computer-assisted engineering determination of the formability limit for thin sheet metals by a modified Marciniak method

Development of a new sheet metal forming technology in a digital environment demands accurate and reliable mechanical properties and forming limits of the selected material. It is critical to determine the forming limits for thin sheets and foils. Implementation of the Marciniak procedure with strip-shaped specimens defining the left hand side of the forming limit diagram (FLD) results in tearing outside of the observed area of the specimen. Therefore, new shapes of test-pieces were designed that have a strip-shaped central area and enlarged outer areas which are in contact with a die during the forming process. The radius of the specimen enlargement enables a co-axial contact of its edge and direction of a material flow over the die radius during the forming process. The shape of redesigned geometry of the specimen was analysed with the finite element (FE) program ABAQUS to minimise undesired stress concentrations at the die radius. Finally, strain paths variations due to shape change were analysed. The new specimen concept was verified on TS-275 tinplate steel with 0.24 mm thickness. By implementing the necessary redesigned specimen shapes and by analysis of the tearing limit of TS-275 material, the forming limit curve for the analysed tinplate material was constructed.

forming limit diagram; new testing method; tinplate sheet metal; finite element analysis

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Podaci o izdanju

44 (6)

2009.

459-472

objavljeno

0309-3247

10.1243/03093247JSA503

Povezanost rada

Računarstvo, Strojarstvo, Temeljne tehničke znanosti

Poveznice
Indeksiranost