A Study of Fatigue Crack Growth Rate in Steels in Relation to Crack-Tip Plastic Deformation and Fracture. Part 1. Test Methods and Results for 10GN2MFA Steel

The methods for low-cycle fatigue testing and cyclic crack growth testing of 10GN2MFA steel at 20 and 270°C are described. Based on test results, fatigue crack growth rate curves are plotted and the characteristics of low-cycle plastic deformation and fracture are found. A difference in the kinetics...

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Veröffentlicht in:	Strength of materials 2020-03, Vol.52 (2), p.228-234
Hauptverfasser:	Tsybanev, G. V., Gopkalo, A. P., Kurash, Yu. P., Novikov, A. I.
Format:	Artikel
Sprache:	eng
Schlagworte:	Analysis Characterization and Evaluation of Materials Chemistry and Materials Science Classical Mechanics Crack propagation Crack tips Fatigue Fatigue failure Fatigue life Fatigue testing machines Fatigue tests Fracture mechanics High strength low alloy steels Low cycle fatigue Materials Materials Science Metal fatigue Methods Plastic deformation Solid Mechanics Steel Stress intensity factors Test methods
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Zusammenfassung:	The methods for low-cycle fatigue testing and cyclic crack growth testing of 10GN2MFA steel at 20 and 270°C are described. Based on test results, fatigue crack growth rate curves are plotted and the characteristics of low-cycle plastic deformation and fracture are found. A difference in the kinetics of low-cycle plastic deformation is shown – the cyclic softening at 20°C and hardening at 270°C – which has an influence on fatigue life and fatigue crack growth resistance of this steel. The last-mentioned characteristic has been studied using two test methods: (i) with a decreasing stress intensity factor range and (ii) with a constant magnitude of load.
ISSN:	0039-2316 1573-9325
DOI:	10.1007/s11223-020-00169-8