Computational modelling of shot-peening effects on crack propagation under fretting fatigue

Abstract

Recent experimental studies have demonstrated fretting fatigue life enhancement of titanium alloy Ti-6A1–4V specimens after treatment by shot-peening. Because of complexities in tracking crack growth under fretting conditions experimentally, the present work describes computational modelling for crack propagation behaviour in specimens with and without shot-peening. A crack growth model is combined with a finite element submodelling technique to assess the crack trajectory and crack propagation life in the specimens under fretting fatigue. A parametric numerical analysis has been performed to investigate crack trajectories and stress intensity factors along the crack path under different loading conditions. Obtained results revealed the features of the crack growth trajectory and stress intensity factors in the presence of residual stresses from shotpeening. These results also demonstrated a significant (2–3 times) increase in the crack propagation life of shot-peened specimens relative to virgin specimens (i.e. without shot-peening), which is in agreement with experimental observations.

Keywords

computational modelling shot-peening crack propagation fretting fatigue

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