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Local cyclic plasticity near stress concentrations governs the fatigue crack initiation in cyclicly loaded Ni‐based single‐crystal superalloys, but has not been well studied and understood. The first of its kind transmission electron microscopy (TEM)‐based site‐specific study of plasticity in the crack initiation region in a notched single‐crystal superalloy subjected to fatigue testing at 800 °C,...
The effects of grain size, source density, and misorientations on the dislocation configurational energy area density are investigated using two-dimensional discrete dislocation plasticity. Grain boundaries are modeled as impenetrable to dislocations. The considered grain size ranges from $$ 0.4\;\upmu{\text{m}}^{2} $$ 0.4 μ m 2 to $$ 8.0\;\upmu{\text{m}}^{2} $$ 8.0 μ m 2 ...
Predicting when and where materials fail is a holy grail for structural materials engineering. Development of a predictive capability in this domain will optimize the employment of existing materials, as well as rapidly enhance the uptake of new materials, especially in high-risk, high-value applications, such as aeroengines. In this article, we review and outline recent efforts within our research...
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