Micromechanical modelling of damage and failure in dual phase steels

Junhe Lian*, Napat Vajragupta, Sebastian Münstermann

*Corresponding author for this work

Research output: Chapter in Book/Report/Conference proceedingConference contributionScientificpeer-review

1 Citation (Scopus)

Abstract

Dual phase (DP) steels consisting of two phases, ferrite and dispersed martensite, offer an attractive combination of strength and stretchability, which is a result of the strong distinctions of these constituents in mechanical properties. However, the damage behaviour in DP steels exhibits a rather complex scenario: voids are generated by the debonding of the hard phase from the matrix and the inner cracking of the hard phase in addition to by inclusions. The target of this study is to describe the initiation and evolution of damage in DP steel and develop a microstructure-based model which is capable of reflecting the underlying damage mechanisms. Both uniaxial and biaxial tensile tests are performed and the subsequent metallographic investigations are executed to reveal the mechanisms of damage initiation and evolution under different stress state condition and attention will be paid on the influence of various microstructural features on the initiation of damage. In finite element (FE) simulations, the microstructural features are taken into account by the representative volume elements (RVE). Different treatments of the constitutive behaviour of each constituent including isotropic hardening rule and crystallographically dependent configuration with crystal plasticity finite element method are investigated. Several numerical aspects are also discussed, such as RVE size, mesh size, element type, and boundary connections. In the end, the study is attempting to achieve a quantitative assessment of the cold formability of the investigated steel in a microscopic level based on microstructure information of material as well as to understand the damage mechanisms under different stress states condition which cause the macroscopic failure during plastic deformation.

Original languageEnglish
Title of host publicationThe Current State-of-the-Art on Material Forming
Subtitle of host publicationNumerical and Experimental Approaches at Different Length-Scales
Pages2369-2374
Number of pages6
DOIs
Publication statusPublished - 29 Jul 2013
MoE publication typeA4 Article in a conference publication
EventInternational ESAFORM Conference on Material Forming - Aveiro, Portugal
Duration: 22 Apr 201324 Apr 2013
Conference number: 16

Publication series

NameKey Engineering Materials
Volume554-557
ISSN (Print)1013-9826

Conference

ConferenceInternational ESAFORM Conference on Material Forming
Abbreviated titleESAFORM
CountryPortugal
CityAveiro
Period22/04/201324/04/2013

Keywords

  • Crystal plasticity
  • DP steel
  • Finite element simulation
  • Localization
  • Microstructure
  • Representative volume elements

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