Abstract
To consider the effect of crack closure on the mechanical properties of metals, the fatigue life of metal specimens is predicted based on energy dissipation model. The main feature of the model consists in considering the relationship between the total failure energy and the energy density increment. The total failure energy model considers the fatigue crack size and stress amplitude. It is assumed the energy density increment gradually decreases and tends to be stable. The influence of crack closure effect is considered. According to the law of metal fatigue characteristics, a new mathematical model for predicting fatigue life is established.
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Abbreviations
- \( b \) :
-
Fatigue strength exponent
- \( c \) :
-
The fatigue ductility exponent
- \( \Delta \sigma \) :
-
Stress range
- \( \sigma_{a} \) :
-
Maximum tensile stress
- \( a_{\text{c}} \) :
-
Critical crack size
- \( a{}_{0} \) :
-
Initial crack size
- \( n \) :
-
Strain hardening exponent
- \( n^{\prime } \) :
-
Cyclic strain hardening exponent
- \( \varepsilon_{\text{f}} \) :
-
Fracture ductility
- \( \varepsilon_{\text{f}}^{{\prime }} \) :
-
Cyclic fatigue ductility coefficient
- \( \Delta \varepsilon_{\text{p}} \) :
-
Plastic strain range
- \( \Delta \varepsilon_{{{\text{p}}Z}} \) :
-
Plastic strain increment under equivalent stress increment
- \( \alpha \) :
-
Equivalent strain increment parameter
- \( W_{\text{p}} \) :
-
Plastic strain energy
- \( \sigma_{\text{f}}^{\prime } \) :
-
Cyclic fatigue strength coefficient
- \( \delta {\text{W}} \) :
-
One-cycle plastic strain energy increment
- \( K^{\prime } \) :
-
Cyclic stress intensity coefficient
- \( W_{\text{pf}} \) :
-
Total failure energy
- \( \sigma_{b} \) :
-
Ultimate tensile strength
- \( K_{\text{theff}} \) :
-
Effective initial stress intensity factor
- \( K_{I} \) :
-
Stress intensity factor
- \( \sigma_{\text{f}} \) :
-
Fracture strength
- \( N_{\text{f}} \) :
-
Fatigue life
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This work is supported by the National Natural Science Foundation of China (51675324).
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Wu, Q., Liu, X., Liang, Z. et al. Fatigue life prediction model of metallic materials considering crack propagation and closure effect. J Braz. Soc. Mech. Sci. Eng. 42, 424 (2020). https://doi.org/10.1007/s40430-020-02512-1
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DOI: https://doi.org/10.1007/s40430-020-02512-1