夹杂对粉末高温合金裂纹扩展寿命的影响赵勇铭.pdf

DOI: 10. 1 224 /j .cnki . jasp.2005.05.012 20　5 Vol. 20 No. 5 200510 Journal of Aerospace Power Oct. 2005 : 1000-8055(2005) 05-0772-06 赵勇铭, 宋迎东 ( , 210016) : , FGH95, ;, Paris,。: ,,; ,, , , FGH95,,, , 。 。 　　: 、; ; ; ; : V2 1. 91　　　　　: A Inf l uence of Incl usions on Crack Growth Lif e of Powder Metall urgy - , - ZHAO Yong ming SON G Ying dong ( College of Energy and Pow er Engineering, Nanjing University of Aeronautics and Astronautics, Nanjing 210016, China) Abstract: The influence of inclusion on crack Stress Intensity Factor ( SIF) of Powder M et- allurgy ( PM) FGH 95 w as investigated using singular element method with fine mesh at crack front The effect of inclusion on crack growth life of PM w as also calculated by Paris formula. . The result indicates that the influence of inclusions on crack SIF of PM changes with the alter- ation of the inclusion slocation relative to the crack. When the crack is in the range of three times , of the inclusion s radius theinclusion can affect the SIF and it w ill not affect on it if the crack ex- . , ceeds this range When the radius of the crack approaches the radius of the inclusion the influence of soft inclusions on SIF is contrary to the rigid inclusions. For the crack growth life, the influence of soft inclusion is also contrary to the rigid inclusions. The crack growth life with