Large rotations of the grain-scale stress tensor during yielding set the stage for failure

Jishnu J. Bhattacharyya, Darren C. Pagan, Sean R. Agnew

Research output: Contribution to journalArticlepeer-review

Abstract

The stress-state within individual grains in a polycrystal determine the fate of the aggregate including mechanical failure. By tracking the evolution of the stress tensor throughout the elastoplastic transition, large rotations of the stressstate, which have long been theorized to occur, are observed experimentally for the first time. These stress rotations (∼15°) are more than an order of magnitude larger than the concomitant crystallographic lattice reorientations (∼0.9°) well-known to occur during metal plasticity. Furthermore, these rotations are accompanied by a decrease in stress triaxiality within certain grains, promote strain softening, and set the stage for failure at an early stage of deformation. These results provide a completely new perspective through which to contemplate the question of “hot-spots” responsible for failure of high-performance structural materials.

Original languageEnglish (US)
Article number103087
JournalInternational journal of plasticity
Volume146
DOIs
StatePublished - Nov 2021

All Science Journal Classification (ASJC) codes

  • Materials Science(all)
  • Mechanics of Materials
  • Mechanical Engineering

Fingerprint

Dive into the research topics of 'Large rotations of the grain-scale stress tensor during yielding set the stage for failure'. Together they form a unique fingerprint.

Cite this