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DENG Caiyan, GAO Ren, GONG Baoming, WANG Dongpo. Research on ultra-high-cycle fatigue properties of 7050 aluminum alloy FSW welded joints[J]. TRANSACTIONS OF THE CHINA WELDING INSTITUTION, 2018, 39(11): 114-118. DOI: 10.12073/j.hjxb.2018390284
Citation: DENG Caiyan, GAO Ren, GONG Baoming, WANG Dongpo. Research on ultra-high-cycle fatigue properties of 7050 aluminum alloy FSW welded joints[J]. TRANSACTIONS OF THE CHINA WELDING INSTITUTION, 2018, 39(11): 114-118. DOI: 10.12073/j.hjxb.2018390284

Research on ultra-high-cycle fatigue properties of 7050 aluminum alloy FSW welded joints

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  • Received Date: May 02, 2017
  • Ultra high cycle fatigue tests were used to test the fatigue property of 7050 aluminum alloy friction stir welding joint in the very high cycle regime. The results show that fracture still occurs in the welded joints after 107 cycles, and the S-N curves present multi-stage decreasing shapes with the turning point at about 108 cycles. The fatigue fracture morphology of specimen was observed by scanning electron microscope. It is found that fatigue cracks always initiated at the surface under the condition of high stress. However, fatigue crack initiation sites were inclined to transform from surface to subsurface or interior as cyclic loading decreased. The actual initiation sites depend on the competition mechanism of crack initiation from surface, subsurface or interior. Most of the specimens fractured at thermo- mechanical affected zone (TMAZ) and heat affected zone(HAZ). The fracture location is closely related to inhomogeneous microstructure of FSW joint through the EBSD and hardness analysis .
  • 佟建华, 张 坤, 林 松, 等. 搅拌摩擦焊和熔化极气体保护焊6082铝合金疲劳性能分析[J]. 焊接学报, 2015, 36(7): 105 ? 108
    Tong Jianhua, Zhang Kun, Lin Song, et al. Comparison of fatigue property of 6082 aluminum alloy joint by friction stir welding and metal inert-gas welding[J]. Transactions of the China Welding Institution, 2015, 36(7): 105 ? 108
    何 超, 崔仕明, 刘永杰, 等. 气孔对铝合金焊接接头超长疲劳寿命的影响[J]. 焊接学报, 2014, 35(11): 18 ? 22
    He Chao, Cui Shiming, Liu Yongjie, et al. Effect of pore on super long fatigue life of aluminum alloy welded joint[J]. Transactions of the China Welding Institution, 2014, 35(11): 18 ? 22
    王清远. 超高周加速疲劳实验研究[J]. 四川大学学报, 2002, 34(3): 6 ? 11
    Wang Qingyuan. Accelerated fatigue testing by ultrasonic loading[J]. Journal of Sichuan University (Engineering Science Edition), 2002, 34(3): 6 ? 11
    Mishra R S, Ma Z Y. Friction stir welding and processing[J]. Materials Science & Engineering R Reports, 2005, 50(1): 1 ? 78.
    Sillapasa K, Surapunt S, Miyashita Y, et al. Tensile and fatigue behavior of SZ, HAZ and BM in friction stir welded joint of rolled 6N01 aluminum alloy plate[J]. International Journal of Fatigue, 2014, 63(63): 162 ? 170.
    吴良晨, 王东坡, 邓彩艳, 等. 超长寿命区间16Mn钢焊接接头疲劳性能[J]. 焊接学报, 2008, 29(3): 117 ? 120
    Wu Liangchen, Wang Dongpo, Deng Caiyan, et al. Fatigue properties of welded joints of 16Mn steel in super long life region[J]. Transactions of the China Welding Institution, 2008, 29(3): 117 ? 120
    Mughrabi H. On ‘multi-stage’ fatigue life diagrams and the relevant life-controlling mechanisms in ultrahigh-cycle fatigue[J]. Fatigue & Fracture of Engineering Materials & Structures, 2002, 25(8-9): 755 ? 764.
    Takahashi Y, Yoshitake H, Nakamichi R, et al. Fatigue limit investigation of 6061-T6 aluminum alloy in giga-cycle regime[J]. Materials Science & Engineering A, 2014, 614(614): 243 ? 249.
    Schwerdt D, Pyttel B, Berger C. Fatigue strength and failure mechanisms of wrought aluminium alloys in the VHCF-region considering material and component relevant influencing factors[J]. International Journal of Fatigue, 2011, 33(1): 33 ? 41.
    Deng C, Wang H, Gong B, et al. Effects of microstructural heterogeneity on very high cycle fatigue properties of 7050-T7451 aluminum alloy friction stir butt welds[J]. International Journal of Fatigue, 2016, 83: 100 ? 108.
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