|About this Abstract
||2018 TMS Annual Meeting & Exhibition
||Fracture: 65 Years after the Weibull Distribution and the Williams Singularity
||Void Initiation during Ductile Rupture of Pure Metals
||Philip Noell, Jay Carroll, Khalid Hattar, Blythe Clark, Brad Boyce
|On-Site Speaker (Planned)
In the absence of pre-existing failure-critical defects, the fracture process in deformable metals loaded in tension begins with the nucleation of internal cavities in regions of elevated triaxial stress. While ductile rupture processes initiate at second-phase particles in many alloys, nucleation in pure metals is often assumed to be associated with grain boundaries. This study presents several ex-situ observations of incipient void nucleation in pure tantalum during interrupted tensile tests. Instead of forming at grain boundaries, voids initiated at and grew along boundaries created by plastic deformation. The observations of this investigation suggest that voids in pure materials nucleate by vacancy condensation and subsequently grow by consuming dislocations. Sandia National Laboratories is a multi-mission laboratory managed and operated by National Technology and Engineering Solutions of Sandia, LLC., a wholly owned subsidiary of Honeywell International, Inc., for the U.S. Department of Energy’s National Nuclear Security Administration under contract DE-NA0003525.
||Planned: Supplemental Proceedings volume