Direct numerical simulation of deformation twinning in polycrystals

Shawn A. Chester, Joel V. Bernier, Nathan R. Barton, Levente Balogh, Bjørn Clausen, John K. Edmiston

Research output: Contribution to journalArticlepeer-review

13 Scopus citations

Abstract

The ability to directly simulate the formation of twin domains in crystalline materials is of interest to the mechanics of materials community. While extensive work has been published on homogenized crystal mechanics treatments of twinning, publications that directly capture twin domain formation are relatively rare. This is due both to the complexities of model development and to the computational costs involved. We present results from simulations of twinning in polycrystals with finite elements that spatially resolve twin formation. Effects of interest include the role of stress concentrations in twin initiation, the interactions among twin systems, and competition between deformation twinning and dislocation glide plasticity. We anticipate that results from models that spatially resolve twin formation will help to inform more homogenized multiscale schemes. We show basic features of the model via numerical simulations on a model polycrystal system in simple shear, and also examine the complete model through large scale simulation of a dynamically compressed polycrystal. Comparisons are made between experimental data from far-field high energy diffraction microscopy (HEDM) and numerical simulations for a magnesium alloy polycrystal in compression. We finish with some final remarks and directions for future work.

Original languageEnglish (US)
Pages (from-to)348-363
Number of pages16
JournalActa Materialia
Volume120
DOIs
StatePublished - Nov 1 2016

All Science Journal Classification (ASJC) codes

  • Electronic, Optical and Magnetic Materials
  • Ceramics and Composites
  • Polymers and Plastics
  • Metals and Alloys

Keywords

  • Crystal plasticity
  • High-energy X-ray diffraction microscopy
  • Magnesium alloy
  • Tantalum
  • Twinning

Fingerprint

Dive into the research topics of 'Direct numerical simulation of deformation twinning in polycrystals'. Together they form a unique fingerprint.

Cite this