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

Autori
Pepelnjak, Tomaž ; Barišić, Branimir

Izvornik
Journal of Strain Analysis for Engineering Design (0309-3247) 44 (2009), 6; 459-472

Vrsta, podvrsta i kategorija rada
Radovi u časopisima, članak, znanstveni

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

Sažetak
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.

Izvorni jezik
Engleski

Znanstvena područja
Računarstvo, Strojarstvo, Temeljne tehničke znanosti

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