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A New Three-Parameter Model for Predicting Fatigue Crack Initiation Life

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Abstract

Based on the idea that the fatigue damage is caused by the cyclic damage strain, a concept of the critical damage quantity is introduced and a new three-parameter model is developed. The model contains three material performance parameters, i.e., the fatigue ductility coefficient, the fatigue ductility exponent, and the theoretical strain endurance limit. The fatigue ductility coefficient reflects the existence of the critical damage quantity. The fatigue ductility exponent shows the damage resistance ability of the material. And the theoretical strain endurance limit represents the existence of the critical cyclic strain. By using the proposed model, the fatigue crack initiation life of metallic materials can be predicted.

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Abbreviations

N i :

fatigue crack initiation life

Δεp :

cyclic plastic strain range

ΔεD :

cyclic damage strain range

c :

fatigue ductility exponent

\( \upsigma_{\text{f}}^{\prime } \) :

fatigue strength coefficient

εf :

fracture ductility

σ−1 :

stress endurance limit

Δε:

cyclic strain range

Δεe :

cyclic elastic strain range

Δεc :

theoretical strain endurance limit

\( \upvarepsilon_{\text{f}}^{\prime } \) :

fatigue ductility coefficient

b :

fatigue strength exponent

σb :

ultimate tensile strength

E :

Young’s modulus

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Authors and Affiliations

  1. The Science Institute, Air Force Engineering University, Xi’an, 710051, China

    Zhongping Zhang, Qiang Sun, Chunwang Li, Yanjiang Qiao & Dongwei Zhang

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  1. Zhongping Zhang
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  2. Qiang Sun
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  3. Chunwang Li
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  4. Yanjiang Qiao
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  5. Dongwei Zhang
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Correspondence to Zhongping Zhang.

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Zhang, Z., Sun, Q., Li, C. et al. A New Three-Parameter Model for Predicting Fatigue Crack Initiation Life. J. of Materi Eng and Perform 20, 169–176 (2011). https://doi.org/10.1007/s11665-010-9667-4

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  • DOI: https://doi.org/10.1007/s11665-010-9667-4

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