Volume 27 Issue 5
May  2012
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Article Navigation >  Journal of Aerospace Power  > 2012  >  27(5): 1105-1112
XIN Peng-peng, HU Xu-teng, SONG Ying-dong. LCF life prediction for TC4 alloy notched specimens based on theory of critical distance[J]. Journal of Aerospace Power, 2012, 27(5): 1105-1112.
Citation: XIN Peng-peng, HU Xu-teng, SONG Ying-dong. LCF life prediction for TC4 alloy notched specimens based on theory of critical distance[J]. Journal of Aerospace Power, 2012, 27(5): 1105-1112.
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LCF life prediction for TC4 alloy notched specimens based on theory of critical distance

  • State Key Laboratory of Mechanics and Control of Mechanical Structures, College of Energy and Power Engineering, Nanjing University of Aeronautics and Astroncsutics, Nanjing 210016, China

  • Received Date: 2011-06-09
  • Publish Date: 2012-05-28
    Abstract
  • Low cycle fatigue (LCF) life prediction and critical distance analysis for TC4 alloy notched specimens were conducted.The correlation between the critical distance and fatigue life,load ratio,stress concentration factor and their influence on the fatigue life prediction were studied.The result suggests that the critical distance of TC4 alloy is not only related to the fatigue life,but also to the load ratio and stress concentrate factor.For the same load ratio,the power function can be used to describe the relationship between the critical distance and the fatigue life.For TC4 alloy notched specimens,when the load ratios were -1 and 0.1,the critical distance-fatigue life curves almost coincide;when the load ratios rose up to R=0.5,the critical distance increased obviously.For the same load ratio and fatigue life,the critical distance of TC4 alloy notched specimens was approximately inverse to the stress concentrate factor.Life prediction results show that the correlation between critical distance and fatigue life,load ratio,stress concentration factor must be considered to obtain more accurate fatigue life prediction for notched TC4 alloy using the theory of critical distance.

     

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