PSI - Issue 39

4

Author name / Procedia Structural Integrity 00 (2021) 000–000

Jesús Toribio et al. / Procedia Structural Integrity 39 (2022) 726–729

729

2.0

1.5

1.0

a/b

0.5

0.0

0.0 0.1 0.2 0.3 0.4 0.5 0.6 0.7 0.8 a/t

Fig. 5. Fatigue evolution in hydrogen (cracks emanating from a hole with r = 2 t ).

4. Conclusion Fatigue evolution in a corner crack emanating from a hole placed in a plate under cyclic tensile loading tends asymptotically towards a preferential crack path ( a / b - a / t ) P , such a crack path being different in air-fatigue than in corrosion-fatigue. The convergence (approach between curves) is quicker in air-fatigue (greater Paris exponent m ) than in corrosion-fatigue, and also faster in the absence of hole (corner cracks) and for elevated values of the initial crack aspect ratio. References Lin, X.B., Smith, R.A., 1998. Fatigue shape analysis for corner cracks at fastener holes. Engineering Fracture Mechanics 59, 73–87, Liu, C., Chu, S., 2015. Prediction of shape change of corner crack by fatigue crack growth circles. International Journal of Fatigue 75, 80–88. Raju, I.S., Newman Jr., J.C., 1979. Stress-intensity factors for two symmetric corner cracks. In Fracture Mechanics; Smith, C.W., Ed.; American Society for Testing and Materials: West Conshohocken, USA; pp. 411–430. Raju, I.S., Newman Jr., J.C., 1987. Finite-Element Analysis of Corner Cracks in Rectangular Bars (NASA Technical Memorandum 89070); NASA: Hampton VA, USA. Roy, A., Manna, I., Chattoraj, I., 2014. Anomalies in hydrogen enhanced fatigue of a high strength steel. International Journal of Fatigue 59, 14– 22. Grandt Jr., A.F., Macha, D.E., 1983. Digitized measurements of the shape of corner cracks at fastener holes. Engineering Fracture Mechanics 17, 63–73.