Prediction of Crack Constant in Smooth Materials

  • Yu Rongzhen
  • Cheng Lixian
Conference paper


A formula \(\Delta \;{\text{K}}_{\text{th}} = \Delta \;\sigma _{\text{e}} \sqrt {\pi a_0 {\text{Y}}\left( a \right)} \) is deduced in this paper based on the energy transfer relations in the materials under cyclic stresses. From this formula, a crack constant which exists in smooth materials can be predicted.

In the formula, both the threshold stress intensity factor Δ Kth and the fatigue limit Δ σe are the constants for given material in given condition, ao is also a constant for given material in given condition. The dimension of ao is a length. The above formula may be deduced from crack initialing process and ao can be called as a crack constant in the smooth materials.


Stress Intensity Factor Internal Friction Fatigue Limit Cyclic Stress Engineer Fracture Mechanics 


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    EL Haddad, M. H., Topper, T, H., Smith, K, N. Engineering Fracture Mechanics, 11, 577–534 (1979).CrossRefGoogle Scholar

Copyright information

© Springer Japan 1986

Authors and Affiliations

  • Yu Rongzhen
    • 1
  • Cheng Lixian
    • 2
  1. 1.Chinese Helicopter Research and Development InstituteJingdezhen, JiangxiChina
  2. 2.Jiangxi Vocational University of Electric EngineeringNanchang, JiangxiChina

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