Acta Metall Sin  1992, Vol. 28 Issue (5): 44-50    DOI:

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FATIGUE CRACK PROPAGATION IN Al-Li ALLOY 8090

WANG Zhongguang;ZHANG Yun;HU Zhuangqi;HE Shiyu;LI Qingjian State Key Laboratory for Fatigue and Fracture of Materials; Institute of Metal Research; Academia Sinica; Shenyang Harbin Institute of Technology; Correspendent profersor; Insitute of Research; Acodemia Sinica; Sheyang 110015

WANG Zhongguang;ZHANG Yun;HU Zhuangqi;HE Shiyu;LI Qingjian State Key Laboratory for Fatigue and Fracture of Materials; Institute of Metal Research; Academia Sinica; Shenyang Harbin Institute of Technology; Correspendent profersor; Insitute of Research; Acodemia Sinica; Sheyang 110015. FATIGUE CRACK PROPAGATION IN Al-Li ALLOY 8090. Acta Metall Sin, 1992, 28(5): 44-50.

Abstract References Related Articles Recommended Metrics Download:  PDF(2091KB)  Export:  BibTeX | EndNote (RIS)       Abstract  Fatigue crack growth rates of 8090 type Al-Li alloy in air were found to bestrongly dependent upon the aging conditions. The naturally aged and underaged specimensshowed the highest resistance to the fatigue crack propagation. The fatigue crack growth re-sistance of the overaged specimen is the lowest and that of the peakaged specimen in between.As compared to air, 3.5%NaCl solution did not change the effect of aging conditions on thefatigue crack growth, but caused a decrease of the resistance to the fatigue crack growth un-der the same aging condition. Both short cracks from notch and physically short cracksshowed much higher rates of fatigue crack propagation in comparison with long cracks underthe same aging condition and stress intensity level. The growth behavior of the short crackdepends on its type. The growth rate of short crack from notch decreases first to a minimumand then increases with increasing AK. However, the physically short crack grows at aprogressively increasing rate. The effects of aging conditions were explained in terms of theslip planarity of dislocations and the cyclic slip reversibility. The observed short crack behav-ior was considered to be dependent on the crack closure and the local plasticity near the crack Key words:  Al-Li alloy      short and long fatigue crack      closure effect      slip planarity      Received:  18 May 1992      Service E-mail this article Add to citation manager E-mail Alert RSS （） Articles by authors URL:  https://www.ams.org.cn/EN/     OR     https://www.ams.org.cn/EN/Y1992/V28/I5/44 1 Jata K V, Starke E A Jr., Metall. Trans., 1986; 17A: 1011 2 Venkateswara Rao K T, Yu W, Ritchie R O. Metall Trans, 1988; 19A: 549 3 Venkateswara Rao K T, Yu W, Ritchie R O. 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