|About this Abstract
||2018 TMS Annual Meeting & Exhibition
||Additive Manufacturing of Metals: Fatigue and Fracture
||Investigating Strain Localization in Additively Manufactured Ti-alloys Using Experimentally Validated Crystal Plasticity Simulations, Explicitly Accounting for Residual Stresses
||Kartik Kapoor, Todd Book, Michael D Sangid
|On-Site Speaker (Planned)
Titanium alloys, produced via Additive Manufacturing (AM) techniques offer tremendous benefits over conventional manufacturing processes. However, there is inherent uncertainty associated with their properties, often stemming from presence of residual stresses in the material, preventing their use as critical components. This work investigates Ti-6Al-4V produced via direct metal laser sintering by carrying out crystal plasticity finite element (CPFE) simulations and digital image correlation on samples subject to cyclic loading. A method to incorporate residual stresses via geometrically necessary dislocations is implemented within the CPFE framework. Simulation results match well with digital image correlation and indicate that prior beta boundaries play an important role in strain localization. Possible sites for damage nucleation are identified, which correspond to regions of high plastic strain accumulation. Further, a more robust method to incorporate residuals stresses is proposed and is tested with an available dataset of High-Energy Diffraction Microscopy experiments performed on Ti-alloys.
||Planned: Supplemental Proceedings volume