|About this Abstract
||2016 TMS Annual Meeting & Exhibition
||Fatigue in Materials: Fundamentals, Multiscale Modeling and Prevention
||Intergranular Strain Evolution near Fatigue Crack Tips in Polycrystalline Materials
||Yanfei Gao, Rozaliya Barabash, Peter Liaw
|On-Site Speaker (Planned)
Investigations on fracture and fatigue typically rely on ex situ microstructural characterizations and crack growth monitoring with replica techniques. The in situ, nondestructive neutron diffraction technique, together with the multiscale simulations, will provide us a linkage between the stress analyses (top-down point of view) to the failure mechanisms on inter- and intra-granular scales (bottom-up point of view). An irreversible, hysteretic cohesive interface model is developed to simulate a steady fatigue crack, which generates a continuum deformation history as inputs for the micromechanical analysis of lattice strain evolution. Comparisons with our neutron diffraction tests suggest the intergranular damage near the crack tip process zone be the dominant mechanism for fatigue crack growth.
||Planned: Publication Outside of TMS (Indicate publication title and publisher if known.)