Evaluación del trabajo esencial de fractura en chapa de un acero de alta resistencia de fase dual

D. Gutiérrez; Ll. Pérez; A. Lara; D. Casellas; J. M. Prado

doi:10.3989/revmetalm.1213

Authors

D. Gutiérrez Fundació CTM Centre Tecnològic
Ll. Pérez Fundació CTM Centre Tecnològic
A. Lara Fundació CTM Centre Tecnològic
D. Casellas Fundació CTM Centre Tecnològic - Department of Materials Science and Engineering Metallurgy, Universitat Politècnica de Catalunya
J. M. Prado Fundació CTM Centre Tecnològic - Department of Materials Science and Engineering Metallurgy, Universitat Politècnica de Catalunya

DOI:

https://doi.org/10.3989/revmetalm.1213

Keywords:

Essential work of fracture, EWF, AHSS, Fracture toughness, Notch sharpening

Abstract

Fracture toughness of advanced high strength steels (AHSS), can be used to optimize crash behavior of structural components. However it cannot be readily measured in metal sheet because of the sheet thickness. In this work, the Essential Work of Fracture (EWF) methodology is proposed to evaluate the fracture toughness of metal sheets. It has been successfully applied in polymers films and some metal sheets. However, their information about the applicability of this methodology to AHSS is relatively scarce. In the present work the fracture toughness of a Dual Phase (strength of 800 MPa) and drawing steel sheets has been measured by means of the EWF. The results show that the test requirements are met and also show the clear influence of notch radii on the measured values, specially for the AHSS grade. Thus, the EWF is postulated as a methodology to evaluate the fracture toughness in AHSS sheets.

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