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Experimental and theoretical study on numerical density evolution of short fatigue cracks

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Abstract

Fatigue testing was performed using a kind of triangular shaped specimen to obtain the characteristics of numerical density evolution for short cracks at the primary stage of fatigue damage. The material concerned is a structural alloy steel. The experimental results show that the numerical density of short cracks reaches the maximum value when crack length is slightly less than the average grain diameter, indicating grain boundary is the main barrier for short crack extension. Based on the experimental observations and related theory, the expressions for growth velocity and nucleation rate of short cracks have been proposed. With the solution to phase space conservation equation, the theoretical results of numerical density evolution for short cracks were obtained, which were in agreement with our experimental measurements.

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Authors and Affiliations

  1. Laboratory for Nonlinear Mechanics of Continuous Media, Institute of Mechanics, Chinese Academy of Sciences, 100080, Beijing, China

    Fang Biao, Hong Youshi & Bai Yilong

Authors
  1. Fang Biao
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  2. Hong Youshi
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  3. Bai Yilong
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The project supported by the National Natural Science Foundation of China and the Chinese Academy of Sciences.

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Biao, F., Youshi, H. & Yilong, B. Experimental and theoretical study on numerical density evolution of short fatigue cracks. Acta Mech Sinica 11, 144–152 (1995). https://doi.org/10.1007/BF02487622

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  • DOI: https://doi.org/10.1007/BF02487622

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