|About this Abstract
||2016 TMS Annual Meeting & Exhibition
||Fatigue in Materials: Fundamentals, Multiscale Modeling and Prevention
||Multidisciplinary Approach for Capturing Fatigue Damage Precursor Effects in Metallic Structures under Dynamic Loading
||Ed Habtour, Daniel Cole, Brian Wisner, Antonios Kontsos
|On-Site Speaker (Planned)
This study demonstrates the importance of the interplay between global dynamic parameters and micromechanics in structures when estimating fatigue life. Fatigue damage precursors are identified in a metallic beam exposed to nonlinear vibrations. Stresses during oscillations are kept below the material endurance limit. The change in the dynamic behavior of the structure is thought to be the result of localized micro-plasticity at high stress concentration sites. The damage precursor is identified experimentally by monitoring the reduction in the nonlinear stiffness term in the equation of motion. The evolution of the microstructure through the dynamic process is explored using nanoindentation, atomic force microscopy, scanning electron microscopy and electron backscatter diffraction techniques.
The study shows the change in the nonlinear dynamic is a manifestation of localized micromechanical degradation. The interplay between global dynamics and materials evolution can be a first step in guiding the health assessment of engineering systems.
||Planned: Publication Outside of TMS (Indicate publication title and publisher if known.)