Neighborhood influences on stress and strain partitioning in dual-phase microstructures: An investigation on synthetic polycrystals with a robust spectral-based numerical method

Martin Diehl, Pratheek Shanthraj, Philip Eisenlohr, Franz Roters

Research output: Contribution to journalArticle

  • 8 Citations

Abstract

The mechanical response of multiphase metallic materials is governed by the strain and stress partitioning behavior among their phases, crystals, and subgrains. Despite knowledge about the existence of these complex and long-ranging interactions, the experimental characterization of such materials is often limited to surface observations of microstructure evolution and strain partitioning, i.e. ignoring the influence of the underlying features. Hence, for the interpretation of the observed surface behavior it is imperative to understand how it might be influenced by the subsurface microstructure. In the present study, we therefore systematically change the subsurface microstructure of synthetic dual-phase polycrystals and investigate the altered response of a 2D region of interest. The series of high-resolution crystal plasticity simulations are conducted with a fast and efficient spectral-based iterative scheme for calculating the mechanical response of complex crystalline materials. To overcome the slow convergence of the conventional spectral-based solver when dealing with heterogeneous materials of large contrast in stiffness (or strength), direct and mixed variational conditions for mechanical equilibrium and strain compatibility have been formulated such that they can be combined with a general class of non-linear solution methods. The different solution techniques have been implemented into DAMASK, the Düsseldorf Advanced Material Simulation Kit, and the ones showing the best performance are used in this study. The results show that the subsurface microstructure has a dominant influence on the observed stress and strain partitioning. Additionally, it can be seen that the zone of influence increases with increasing heterogeneity of the microstructure.

LanguageEnglish (US)
Pages429-441
Number of pages13
JournalMeccanica
Volume51
Issue number2
DOIs
StatePublished - Feb 1 2016

Profile

Polycrystals
polycrystals
Numerical methods
microstructure
Microstructure
Crystals
kits
plastic properties
compatibility
crystals
Plasticity
stiffness
simulation
Stiffness
Crystalline materials
high resolution
interactions

Keywords

  • Crystal plasticity
  • Dual-phase steel
  • Spectral method
  • Stress and strain partitioning
  • Voronoi tessellation

ASJC Scopus subject areas

  • Mechanical Engineering
  • Mechanics of Materials
  • Condensed Matter Physics

Cite this

Neighborhood influences on stress and strain partitioning in dual-phase microstructures : An investigation on synthetic polycrystals with a robust spectral-based numerical method. / Diehl, Martin; Shanthraj, Pratheek; Eisenlohr, Philip; Roters, Franz.

In: Meccanica, Vol. 51, No. 2, 01.02.2016, p. 429-441.

Research output: Contribution to journalArticle

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