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This research aims to understand how microstructural features affect the early propagation of fatigue cracks in Inconel 718.

Statistical Analysis of Energy Release Rate Evolution for Microstructurally Small Fatigue Cracks

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This research aims to understand how microstructural features affect the early propagation of fatigue cracks in Inconel 718.
Utilized a 3D conformal global/local finite-element framework with adaptive remeshing
Simulated statistically representative aggregates under linear elastic assumptions
Extracted energy release rates along the crack front using domain integrals
The [101] orientation increases local energy release rate by +172% compared to the [001] orientation (p<0.05)
Sensitivity to microstructural features affects early propagation behavior, leading to scatter in fatigue life
Microstructural influences diminish after the crack front exceeds characteristic grain size significantly

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Randomized trial investigates energy release rate in microstructural fatigue cracks, highlighting critical orientation effects.

Bouyx et al. (2026) studied this question.

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