Plastic deformation and failure mechanisms in nano-scale notched metallic glass specimens under tensile loading

Tanmay Dutta, Ashish Chauniyal, I. Singh, R. Narasimhan, T Prakash G. Thamburaja, U. Ramamurty

Research output: Contribution to journalArticle

7 Citations (Scopus)

Abstract

In this work, numerical simulations using molecular dynamics and non-local plasticity based finite element analysis are carried out on tensile loading of nano-scale double edge notched metallic glass specimens. The effect of acuteness of notches as well as the metallic glass chemical composition or internal material length scale on the plastic deformation response of the specimens are studied. Both MD and FE simulations, in spite of the fundamental differences in their nature, indicate near-identical deformation features. Results show two distinct transitions in the notch tip deformation behavior as the acuity is increased, first from single shear band dominant plastic flow localization to ligament necking, and then to double shear banding in notches that are very sharp. Specimens with moderately blunt notches and composition showing wider shear bands or higher material length scale characterizing the interaction stress associated with flow defects display profuse plastic deformation and failure by ligament necking. These results are rationalized from the role of the interaction stress and development of the notch root plastic zones.

Original languageEnglish
Pages (from-to)393-413
Number of pages21
JournalJournal of the Mechanics and Physics of Solids
Volume111
DOIs
Publication statusPublished - 1 Feb 2018

Fingerprint

Shear bands
Ligaments
Metallic glass
notches
metallic glasses
plastic deformation
Plastic deformation
ligaments
Chemical analysis
Plastic flow
Plasticity
Molecular dynamics
shear
Plastics
Finite element method
Defects
acuity
Computer simulation
plastic flow
plastic properties

Keywords

  • Failure mechanisms
  • Finite element analysis
  • Metallic glasses
  • Molecular dynamics
  • Notched specimens
  • Plastic deformation

ASJC Scopus subject areas

  • Condensed Matter Physics
  • Mechanics of Materials
  • Mechanical Engineering

Cite this

Plastic deformation and failure mechanisms in nano-scale notched metallic glass specimens under tensile loading. / Dutta, Tanmay; Chauniyal, Ashish; Singh, I.; Narasimhan, R.; G. Thamburaja, T Prakash; Ramamurty, U.

In: Journal of the Mechanics and Physics of Solids, Vol. 111, 01.02.2018, p. 393-413.

Research output: Contribution to journalArticle

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