Abstract
A physical model has been developed to quantify the sliding mode crack closure (SMCC) experienced in cyclic mode II loading conditions. Idealized crystallographic surface geometry and Coulomb friction behaviour were assumed in the model. The results reveal that faceted crack surfaces will generate a local wedging mode I component while frictional attenuation tends to reduce the effective mode II stress intensity factor range. It is found that asperity angle and friction coefficient are two fundamental factors influencing near-threshold fatigue crack growth behaviour during the entire fatigue cycle. The local stress-strain field is significantly altered due to the wedging mode I component and frictional attenuation of the nominal mode II component. It is concluded that ideal mode II loading may never be achieved in practice for polycrystalline materials due to the inevitable existence of local mixed mode loading conditions.
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