Limit Strains Analysis of Advanced High Strength Steels Sheets Based on Surface Roughness Measurements

Abstract:

The limit strains of dual-phase steels DP600 and 800 were evaluated in this work with a localization model formulated in plane-stress conditions using elasto-plastic constitutive equations. In this model, a geometrical imperfection parameter is defined from the sheet nominal thickness, initial ferrite grain size and average surface roughness. The proposed identification procedure provided a more physically meaning for this parameter and at best more conservative predictions in the drawing Forming Limit Curve (FLC) range of both investigated dual-phase steels. Nevertheless, the corresponding limit strains in the biaxial stretching region are underestimated with the present theoretical model. Thus, more detailed anisotropic yield function and hardening descriptions must be implemented to improve the accuracy of the FLC prediction of advanced high strength steels.

• Periodical: Materials Science Forum (Volume 930)
• Pages: 349-355
• DOI: https://doi.org/10.4028/www.scientific.net/MSF.930.349
• Online since: September 2018
• Authors: Lílian Barros da Silveira, Luciano Pessanha Moreira, Ladario da Silva, Rafael Oliveira Santos, Fabiane Roberta Freitas da Silva, Marcelo Costa Cardoso, Maria Carolina dos Santos Freitas
• Keywords: Dual-Phase Steels, Sheet Metal Forming, Surface Roughness, Theoretical Modelling

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