Determination of Damage Criterion Using a Hybrid Analysis for Advanced High Strength Steel

Abstract:

Advanced High Strength (AHS) steels have been increasingly applied in the automotive industries due to their distinguished mechanical properties. Microstructures of these steels play an important role and are designed by constituent phases with distinct characteristics. AHS steels exhibit sophisticated damage mechanisms that complicate the prediction of material formability. In this work, Ductile Crack Initiation Locus (DCIL) was developed for describing failure behavior of dual phase steel sheet. A hybrid experimental and numerical analysis was used to determine the DCIL. Tensile tests of various sample geometries were experimentally carried out and crack initiation occurred during forming was identified by the Direct Current Potential Drop (DCPD) method. Then, FE simulations of the corresponding tests were performed to evaluate local stress triaxialities and equivalent plastic strains of the critical area. The damage curves for both crack initiation and localized necking were obtained. Additionally, the von Mises, Hill48 and Yld2000-2d yield criterion were defined in the calculations in order to examine effect of yield model on the resulted curves. To verify applicability of the damage curves, Nakazima test of uniaxial sample was taken into account.

• Periodical: Advanced Materials Research (Volume 849)
• Pages: 200-206
• DOI: https://doi.org/10.4028/www.scientific.net/AMR.849.200
• Online since: November 2013
• Authors: Sansot Panich*, Viton Uthaisangsuk, Surasak Suranuntchai, Suwat Jirathearanat
• Keywords: AHSS, Crack Initiation, Ductile Damage, FEM Simulation, Yield Function

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