|About this Abstract
||2017 TMS Annual Meeting & Exhibition
||Fatigue in Materials: Fundamentals, Multiscale Modeling and Prevention
||Non-local Stored Energy and J-integral Methods for Microstructure-sensitive Crack Growth
|| , David Wilson
|On-Site Speaker (Planned)
The stage of crack growth during which a strong microstructural sensitivity exists may comprise a quite substantial fraction of fatigue life. The path of the crack growth is often tortuous being influenced by local grain-level anisotropic elasticity and slip, as well as by morphological, crystallographic and grain boundary features (and many others); mixed trans- and inter-granular growth modes are often observed. The rate of growth is also significantly influenced by these features. Hence this study addresses techniques for the quantification of crack growth at the microstructurally-sensitive level. A J-integral approach has been established within a crystal plasticity framework in order to address quantitatively the role of microstructural features. A new non-local stored energy technique has also been established and the two approaches are compared in the context of single and oligocrystal crack growth. The diminution of microstructural sensitivity of crack growth is also addressed.
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