Details

Autor(en) / Beteiligte

• Bang, D.J.
• Ince, A.
• Tang, L.Q.

Titel

A modification of UniGrow 2‐parameter driving force model for short fatigue crack growth

Ist Teil von

• Fatigue & fracture of engineering materials & structures, 2019-01, Vol.42 (1), p.45-60

Ort / Verlag

Oxford: Wiley Subscription Services, Inc

Erscheinungsjahr

2019

Quelle

Wiley Online Library All Journals

Beschreibungen/Notizen

• In this paper, a modification of the UniGrow model is proposed to predict total fatigue life with the presence of a short fatigue crack by incorporating short crack propagation into the UniGrow crack growth model. The UniGrow model is modified by 2 different methods, namely the “short crack stress intensity correction method” and the “short crack data‐fitting method” to estimate the total fatigue life including both short and long fatigue crack propagations. Predicted fatigue lives obtained from these 2 methods were compared with experimental data sets of 2024‐T3, 7075‐T56 aluminium alloys, and Ti‐6Al‐4V titanium alloy. Two proposed methods have shown good fatigue life predictions at relatively high maximum stresses; however, they provide conservative fatigue life predictions at lower stresses corresponding high cycle fatigue lives where short crack behaviour dominates total fatigue life at lower stress levels.