Experimental Study of the Formability of H240LA Steel Sheets under Stretch-Bending Conditions

L.H. Martínez-Palmeth; Andrés J. Martínez-Donaire; Carpoforo Vallellano; G. Centeno; F.J. García-Lomas

doi:10.4028/www.scientific.net/KEM.549.349

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HomeKey Engineering MaterialsKey Engineering Materials Vol. 549Experimental Study of the Formability of H240LA...

Experimental Study of the Formability of H240LA Steel Sheets under Stretch-Bending Conditions

Abstract:

The present work discusses the effect of the punch radius on the formability of H240LA steel sheets of 1.2mm thickness. A series of hemispherical punch tests (Nakazima tests) and stretch-bending tests with cylindrical punches of different diameters have been carried out in order to characterize the influence of the strain gradient in the sheet failure. The limit strains have been obtained using a recently proposed time-dependent methodology, which is applicable not only in conventional Marciniak and Nakazima tests, but also in situations with a severe strain gradient through the sheet thickness. The results show that formability of H240LA steel sheets increases as the t₀/R ratio decreases.

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Periodical:

Key Engineering Materials (Volume 549)

Pages:

349-355

DOI:

https://doi.org/10.4028/www.scientific.net/KEM.549.349

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Online since:

April 2013

Authors:

L.H. Martínez-Palmeth, Andrés J. Martínez-Donaire, Carpoforo Vallellano, G. Centeno, F.J. García-Lomas

Keywords:

Formability, H240LA Steel, Necking, Stretch-Bending

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