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Experimental study and local approach modelling of ductile damage in steels over a wide temperature range

Hor, Anis and Lebrun, Jean-Lou and Morel, Franck Experimental study and local approach modelling of ductile damage in steels over a wide temperature range. (2009) In: 7th EUROMECH Solid Mechanics Conference (ESMC2009), 7 September 2009 - 11 September 2009 (Lisbon, Portugal). (Unpublished)

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Abstract

Several studies have been devoted to the identification and modelling of material damage in different forming processes. The aim of this work is to investigate the commonly used local approach models when applied over a wide temperature range. The models investigated include: the Rice-Tracey model, the Gurson model and its derivatives, and the Rousselier model. In the first section the different techniques used to determine the evolution of material damage are discussed. In-situ tensile tests in a Scanning Electron Microscope were used to identify the origin of the appearance of micro-voids as well as their shape. For the 42CrMo4 steel, Magnesium sulphide inclusions are destroyed, leaving room for elliptical voids. A different mechanism is observed in the 100Cr6 steel in which spherical cavities appear in the ferrite phase. In addition, the evolution of the strain fields is determinate using image correlation software (Correli_Q4). The aim of the second part of this work is to propose changes to the porosity functions of the materials as a function of the strain, degree of triaxiality and temperature. These functions are determined by image analysis of axisymmetrically notched specimens previously deformed under various conditions. The proposed functions are used to extend the above models mentioned above to a wide range of temperatures and strain rates.

Item Type:Conference or Workshop Item (Paper)
Audience (conference):National conference without published proceedings
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Institution:Other partners > Arts et Métiers ParisTech (FRANCE)
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Deposited By: Anis Hor
Deposited On:20 Mar 2015 15:29

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