Fatigue crack bending and propagation from a precrack under mixed-mode conditions (Based on discontinuous displacement along cracks with a center-hole notch)

摘要

Fatigue crack bending and propagation behaviors were studied under mixed-mode conditions, using annealed and fatigue slant precraks with a center-hole notch. the fatigue crack propagation directions were estimated from the maximum tangential stress criterion using the stress intensity factors{(K_Ⅰ)_est, (K_Ⅱ)_est} evaluated from the discontinuous displacements (opening for modeⅠ, sliding for mode Ⅱ) along the precrack, and they were in good agreement with the measured ones.