<abstract xmlns="http://www.w3.org/1999/xhtml"><p>Over the last 60 years, several models have been developed governing different zones of fatigue crack growth from the threshold zone to final failure. The best known model is the Paris law and a number of its based on mechanical, metallurgical and loading parameters governing the propagation of cracks. This paper presents an analytical model developed to predict the fatigue crack propagation rate in the Paris regime, for different material properties, yield strength (σ<sub>y</sub>), Young’s modulus (E) and cyclic hardening parameters (K’, n’) and their influence by variability. The cyclic plastic deformation at a crack tip or any other cyclic hardening rule may be used to reach this objective, for to investigate this influence, these properties of the model are calibrated using available experimental data in the literature. This FCGR model was validated on Al-alloys specimens under constant amplitude load and shows good agreement with the experimental results.</p></abstract>

Over the last 60 years, several models have been developed governing different zones of fatigue crack growth from the threshold zone to final failure. The best known model is the Paris law and a number of its based on mechanical, metallurgical and loading parameters governing the propagation of cracks. This paper presents an analytical model developed to predict the fatigue crack propagation rate in the Paris regime, for different material properties, yield strength (σy), Young’s modulus (E) and cyclic hardening parameters (K’, n’) and their influence by variability. The cyclic plastic deformation at a crack tip or any other cyclic hardening rule may be used to reach this objective, for to investigate this influence, these properties of the model are calibrated using available experimental data in the literature. This FCGR model was validated on Al-alloys specimens under constant amplitude load and shows good agreement with the experimental results.

A Model for Fatigue Crack Growth in the Paris Regime under the Variability of Cyclic Hardening and Elastic Properties

Department of Mechanical Engineering, Faculty of Technology

Laboratory of Materials and Reactive Systems (LMRS)

Fatigue of Aircraft Structures

This work is licensed under the Creative Commons Attribution-NonCommercial-NoDerivatives 3.0 License.

Over the last 60 years, several models have been developed governing different zones of fatigue crack growth from the threshold zone to final failure. The best...

A Model for Fatigue Crack Growth in the Paris Regime under the Variability of Cyclic Hardening and Elastic Properties

Published Online: Aug 09, 2018

Page range: 117 - 135

DOI: https://doi.org/10.1515/fas-2017-0010

Keywords
cyclic plastic strain, elastic properties, cyclic hardening parameters, Young’s modulus, variability, crack tip, fatigue crack growth, constants of the Paris law, Al-alloys

© 2017 Tayeb Kebir et al., published by Sciendo

This work is licensed under the Creative Commons Attribution-NonCommercial-NoDerivatives 3.0 License.

A Model for Fatigue Crack Growth in the Paris Regime under the Variability of Cyclic Hardening and Elastic Properties

Published Online: Aug 09, 2018

Page range: 117 - 135

DOI: https://doi.org/10.1515/fas-2017-0010

Keywordscyclic plastic strain, elastic properties, cyclic hardening parameters, Young’s modulus, variability, crack tip, fatigue crack growth, constants of the Paris law, Al-alloys

© 2017 Tayeb Kebir et al., published by Sciendo

This work is licensed under the Creative Commons Attribution-NonCommercial-NoDerivatives 3.0 License.

Keywords
cyclic plastic strain, elastic properties, cyclic hardening parameters, Young’s modulus, variability, crack tip, fatigue crack growth, constants of the Paris law, Al-alloys