A micromechanical damage simulation of dual phase steels using XFEM
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Author list: Vajragupta N., Uthaisangsuk V., Schmaling B., M�nstermann S., Hartmaier A., Bleck W.
Publisher: Elsevier
Publication year: 2012
Journal: Computational Materials Science (0927-0256)
Volume number: 54
Issue number: 1
Start page: 271
End page: 279
Number of pages: 9
ISSN: 0927-0256
eISSN: 1879-0801
Languages: English-Great Britain (EN-GB)
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Abstract
As a result of their microstructures being made up by constituents with strong distinctions in mechanical properties, multiphase steels exhibit high energy absorption as well as an excellent combination of strength and ductility. Furthermore, the microstructural composition influences the failure behaviour of such kind of steels because of the occurrence of different fracture mechanisms in parallel. When the failure behaviour of dual phase (DP) steels is investigated, several types of failures are typically observed, such as the ductile failure of ferrite, the brittle failure of martensite and the interface debonding between phases. Hence, a reliable microstructure-based simulation approach must be developed that describes material deformation and failure under any given loading condition. In this work, two different damage mechanics methods were employed to study the interaction between failure modes in DP steels by means of a representative volume element (RVE). In order to consider the characteristics of a real microstructure, all involved phases were modelled with a precise volume fraction. Firstly, the extended finite element method (XFEM) was used to study the damage onset and progression in martensitic regions without prescribing the crack path. Secondly, a damage curve was derived and employed for the ductile ferritic phase. By combining these two damage models in the RVE model on microscopic scale, development of different failures modes in DP steels could be investigated. ฉ 2011 Elsevier B.V. All rights reserved.
Keywords
Dual phase steels, Extended finite element method, GTN damage model
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