• CN:11-2187/TH
  • ISSN:0577-6686

›› 2001, Vol. 37 ›› Issue (12): 37-41.

• 论文 • 上一篇    下一篇

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广义断裂性能曲面

张书明;阎楚良;高镇同   

  1. 北京航空航天大学固体力学研究所
  • 发布日期:2001-12-15

GENERALIZEN SURFACE OF FRACTURE BEHAVIOR

Zhang Shuming;Yan Chuliang;Gao Zhentong   

  1. Beijing University of Aeronautics and Astronautics
  • Published:2001-12-15

摘要: 分别利用多参数的福尔曼(Forman)和沃克尔(Walker)裂纹扩展模型,将应力强度因子变程△K和应力强度因子均值Km作为二元变量,建立了空间Km-da/dN-△K曲面。考虑应力幅值和均值的共同作用,建立了沃克尔型裂纹扩展寿命的σa-σm-N*曲面。作为表征材料断裂可靠性性能的重要指标,讨论了断裂性能曲面的测定与拟合方法,并给出了具体应用实例。

关键词: Km-da/dN-△K曲面, σa-σm-N*曲面, 断裂性能, 裂纹扩展, 应力强度因子

Abstract: Three dimensional Km-da/Dn-△K surfaces are established by using the multi-parameter crack propagation models of Forman type and Walker type. In these surfaces, stress intensity factor range and mean stress intensity factor are regarded as two variables. The σa-σm-N* surface of crack propagation life of Walker type has also been established in view of the interaction of the stress amplitude and the mean stress. The measurement, fitting methods and the examples for these surfaces are given.

Key words: Crack propagation, Fracture behmior, Km-da/dN-△Ksurface σa-σm-N*surface, Stress intensity factor

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