应力集中对2024 铝合金高周疲劳寿命的影响 - Journal of.PDF

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应力集中对2024 铝合金高周疲劳寿命的影响 - Journal of.PDF

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应力集中对2024 铝合金高周疲劳寿命的影响 - Journal of

第33 卷第4期东北大学学报 ( 自然科学版 ) Vol133,No.4 2012 年 4 月 Journal of Northeastern niversity( Natural Science) Apr. 2 0 12 2024 刘常升, 李海雄, 杨弥 , 陈岁元 ( , 110819) : 2024 , 2024 S- N / , # # ,,, ;2024 ; , 2024 # : ;S- N ;; ; : TG 113.25 : A : 1005-3026( 2012) 04-0517-04 Effect of Stress Concentration on High Cycle Fatigue Life of 2024 Al Alloy L I U Chang-sheng , L I H ai-x iong , YA N G M i-j un , CH EN S ui-yuan ( Key Laboratory of Anisotropy and Texture of Materials ( Ministry of Education) , Northeastern niversity, Shenyang 110819, China. Corresponding author: LI Chang-sheng, E-mail: csliu @ mail.neu. edu.cn) Abstract: The high cycle fatigue life of 2024 Al alloy was studied at room temperature, and the S-N curves of 2024 Alalloy wereobtained under different stress states. Thefracturemorphology, the crack initiation/ propagation mechanism, as well as the relationship between structure and fatigue performanceof fatigue specimens were analyzed. Theresults showed that the fatigue limit decreases with increasing stress concentration coefficient, and the fatigue limit decreases with the stress ratio under the same stress concentration coefficient. The fatigue fractureof 2024 Alalloy is mainly transgranular fracture. The second phases play the role of restraining the propagation of fatigue crack, and improving obviously the high cycle fatigue strength of 2024 Al alloy. Key words: Al alloy; S-N curve; stress concentration; fatigue; fracture 2024 , 1 S- N [1- 4] , ,S- N # [ 5]