A proposal for unification of fatigue crack growth law

In the present paper, the new fractional-differential dependences of cycles to failure for a given initial crack length upon the stress amplitude in the linear fracture approach are proposed. The anticipated unified propagation function describes the infinitesimal crack length growths per increasing...

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Bibliographic Details
Published in:Journal of physics. Conference series 2017-05, Vol.843 (1), p.12022
Main Author: Kobelev, V.
Format: Article
Language:English
Subjects:
Crack propagation
Fatigue failure
Formulations
Fracture mechanics
Load history
Physics
Railroad accidents & safety
Railroad transportation
Stress propagation
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Summary:In the present paper, the new fractional-differential dependences of cycles to failure for a given initial crack length upon the stress amplitude in the linear fracture approach are proposed. The anticipated unified propagation function describes the infinitesimal crack length growths per increasing number of load cycles, supposing that the load ratio remains constant over the load history. Two unification fractional-differential functions with different number of fitting parameters are proposed. An alternative, threshold formulations for the fractional-differential propagation functions are suggested. The mean stress dependence is the immediate consequence from the considered laws. The corresponding formulas for crack length over the number of cycles are derived in closed form.
ISSN:1742-6588
1742-6596
DOI:10.1088/1742-6596/843/1/012022