Is stored energy density the primary meso-scale mechanistic driver for fatigue crack nucleation?
By Bo Chen, Jun Jiang, F. Dunne. 2018
188 citations recorded by the source corpus.
Abstract Fatigue crack nucleation in a powder metallurgy produced nickel alloy containing a non-metallic inclusion has been investigated through integrated small-scale bend testing, quantitative characterisation (HR-DIC and HR-EBSD) and computational crystal plasticity which replicated the polycrystal morphology, texture and loading. Multiple crack nucleations occurred at the nickel matrix-inclusion interface and both nucleation and growth were found to be crystallographic with highest slip system activation driving crack direction. Local slip accumulation was found to be a necessary condition for crack nucleation, and that in addition, local stress and density of geometrically necessary dislocations are involved. Fatemi-Socie and dissipated energy were also assessed against the experimental data, showing generally good, but not complete agreement. However, the local stored energy density (of a Griffith-Stroh kind) identified all the crack nucleation sites as those giving the highest magnitudes of stored energy.
Subfields: Materials Chemistry, Mechanical Engineering, Mechanics of Materials
View Paper: https://www.semanticscholar.org/paper/480b6cd398f79b6e78bd4841115dd284c0f88bc2
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In Materials Chemistry
In Mechanical Engineering
In Mechanics of Materials
- T. Bieler
- Javier Llorca
- Carlos Gonz'alez
- F. Naya
- Cláudio S. Lopes
- E. Totry
- Javier Segurado
- Pedro P. Camanho
Citations in the corpus
- An analysis of (the lack of) slip transfer between near-cube oriented grains in pure Al (2019, background): “-Moreno et al., 2013) and that strain energy is often used as a metric to identify potential damage sites (e.g. Sangid et al., 2011; Musinki and McDowell, 2016; Wan et al. 2016; Cruzado et al., 2018; Chen et al, 2018), the need to accurately predict localized deformation at and near grain boundaries”