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A new fatigue sensor called smart stress-memory patch, which canestimate the cyclic number, the stress amplitude and the maximum stress from themeasurement of crack length and acoustic emission (AE), is proposed to evaluate thefatigue damage of such infrastructure as bridges and ships, in particular for a singlesteel bar JIS G 3502 – Galvanized Wire – JSS II 11 – 1994 ( l = 400mm , φ = 7mm )used for Suspension Bridge (“Rainbow Bridge” – Tokyo – Japan). The fatigue crackgrowth behaviour of thin electrodeposited (ED) Cu specimen for this sensor isinvestigated ( l = 40mm , w = 5mm , s = 0.1mm ). The modified stress intensity factor isproposed to introduce the master curve of fatigue crack growth, because the fatiguegrowth behaviour of this patch is affected by the maximum stress and the stress ratio.AE signals are also measured to estimate the AE onset stress and examine Kaiser effectof ED Cu specimen.