|About this Abstract
||2018 TMS Annual Meeting & Exhibition
||Advanced Characterization Techniques for Quantifying and Modeling Deformation
||Using Crystal Plasticity to Predict Local Deformation during Reverse Loading of an Aerospace Alloy
||Michael Atkinson, João Quinta da Fonseca
|On-Site Speaker (Planned)
Although cyclic loading is of great importance in aerospace applications, the origins of the change in flow stress with load path are poorly understood and difficult to predict. Many crystal plasticity models are now, however, capable of predicting macroscopic flow behaviour during non-monotonic load paths, such as the Bauschinger effect often seen when reverse loading. But it remains unclear whether these models are correctly capturing local deformation behaviour or simply fitting macroscopic hardening response. Here we present experimental surface deformation data acquired using in-situ high resolution digital image correlation (HR-DIC) during a reverse load cycle. With resolution better than 200nm, these experiments revealed the discrete nature of deformation in the form of localised crystallographic shear bands. Comparisons were made to simulated reversed loading using a typical implementation of Crystal Plasticity Finite Element Method (CPFEM). It was found that despite correctly predicting macroscopic flow, local deformation behaviour is not fully captured.
||Planned: Supplemental Proceedings volume