|About this Abstract
||2021 TMS Annual Meeting & Exhibition
||Additive Manufacturing Fatigue and Fracture V: Processing-Structure-Property Investigations and Application to Qualification
||Strain Accumulation during Fatigue and Fracture of Additively Manufactured Ti6Al4V: Experiments and Simulations
||Raymundo Muro-Barrios, Raeann M. VanSickle, Huck Beng Chew, John Lambros
|On-Site Speaker (Planned)
Additively manufactured (AM) Ti6Al4V alloys often exhibit void imperfections from their manufacturing process, adding to the background porosity typically responsible for failure in conventional metals, resulting in a two-scale porosity. Driven by the unique microstructure of the AM material these dual-scale voids begin to grow under loading in the vicinity of a crack, leading to eventual crack advance. Here, the accumulation of strains in the AM microstructure is experimentally studied using a combination of high-resolution digital image correlation, optical microscopy, and electron backscatter diffraction (EBSD). On the simulation side, a cracked elasto-plastic material seeded with void distributions representing the two void size scales observed experimentally is modelled using Gurson-type elements. A comparison with experiments is then made for the predicted vs. measured crack paths and strain fields. The numerical simulations, being 3D, also allow us to explore the interaction of the dual-scale voids in the sample interior.