Fatigue behavior and life prediction of A7N01 aluminium alloy welded joint
(1. State Key Laboratory of Advanced Welding and Joining, Harbin Institute of Technology, Harbin 150001, China;
2. Welding Process Section, Dongfang Boiler Group Co., Ltd., Zigong 643001, China)
2. Welding Process Section, Dongfang Boiler Group Co., Ltd., Zigong 643001, China)
Abstract: Fatigue characteristics of A7N01 aluminium alloy welded joint were investigated and a fatigue crack initiation life-based model was proposed. The difference of fatigue crack initiation life among base metal, weld metal and heat affected zone (HAZ) is slight. Furthermore, the ratio of fatigue crack initiation life (Ni) to fatigue life to failure(Nf) is a material dependent parameter, 26.32%, 40.21% and 60.67% for base metal, HAZ and weld metal, respectively. Total fatigue life predicted using the presented model is in good agreement with the experimental data and that using Basquin’s model. The observation results of fatigue fracture surfaces, using scanning electron microscope (SEM), demonstrate that fatigue crack initiates from smooth surface due to welding process for weld metal, blowhole in HAZ causes fatigue crack initiation, and the crushed second phase particles play an important part in fatigue crack initiation in base metal.
Key words: aluminium alloy; A7N01 aluminum alloy; welded joint; crack initiation; fatigue; fatigue life; life prediction