Abstract
The characteristics of fatigue crack propagation behavior near the thickness interface were examined for 6061 T6 aluminium specimens. A series of thin to thick type various thickness specimens was prepared. Fatigue tests were performed under load control in tension-tension. Correction factor of the stress intensity factors (SIF) for various thickness specimens was introduced as the form of F( α, β) where α was a dimensionless crack length and β was the thickness ratio. These correction factors were determined experimentally by means of linear elastic fracture mechanics concepts.
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