PSI - Issue 57

Pierrick Lepitre et al. / Procedia Structural Integrity 57 (2024) 395–403 Author name / Structural Integrity Procedia 00 (2019) 000 – 000

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fatigue limit at 1 % and 99 % probability of rupture at 775 MPa and 965 MPa. With a difference of only 5 MPa on the mean fatigue limit and less than 10 % on the data dispersion, the self-heating method shows an excellent correlation with conventional fatigue tests at R = -1. Another load ratio has been tested with the same level of success. The self-heating curve presents the two dissipation regimes, and the load ratio does not affect the first regime dissipation or the second regime slope. It only affects the dissipation parameterβ, with an earlier transition between the first and the second regimes. For R = -0.25 the self-heating method ( σ AE = 710 MPa) show a good correlation with conventional one, the difference has been estimated to less than 5 MPa. Acknowledgements A part of this study belongs to the “Self - Heating” ANR -Safran-Naval Group research chair (grant no. ANR-20 CHIN-0002), involving Safran Aircraft Engines, Safran Landing Systems, SafranTech, Naval Group, ENSTA Bretagne (IRDL), and Institut Pprime. References Doudard, C., Calloch, S., Cugy, P., Galtier A., Hild F., 2005. A Probabilistic Two - Scale Model for High - Cycle Fatigue Life Predictions. Fatigue Fracture of Engineering Materials and Structures 28, 279 – 88. Munier, R., Doudard, C., Calloch, S., Weber, B., 2014. Determination of high cycle fatigue properties of a wide range of steel sheet grades from self - heating measurements. Int ernational J ournal of Fatigue 63, 46 – 61. Aerospace Material Specification, 2016. AMS6257-F; Steel Bars, Forgings, and Tubing, 1.6Si – 0.82Cr – 1.8Ni – 0.40Mo – 0.08V (0.40 – 0.44C), Consumable Electrode Vacuum Remelted, Normalized and Tempered. Aerospace Material Specification, SAE Inter-national, Warrendale, PA, USA. Chrysochoos, A., Louche, H., 2000. An Infrared Image Processing to Analyse the Calorific Effects Accompanying Strain Localisation. International Journal of Engineering Science 38, 1759 – 1788. Boulanger, T., Chrysochoos, A ., Mabru, C., Galtier, A., 2004. Calorimetric analysis of dissipative and thermoelastic effects associated with the fatigue behavior of steels. International Journal of Fatigue 26, 221 – 229. Bag, A., Delbergue, D., Bocher, P., Lévesque, M., Brochu, M., 2019. Statistical analysis of high cycle fatigue life and inclusion size distribution in shot peened 300M steel. International Journal of Fatigue 118, 126 – 138. Bag, A., Delbergue, D., Ajaja, J., Bocher, P., Lévesque, M., Brochu, M., 2020. Effect of different shot peening conditions on the fatigue life of 300 M steel submitted to high stress amplitudes. International Journal of Fatigue 130, 105274. Bag, A., Lévesque, M., Brochu, M., 2020. Effect of shot peening on short crack propagation in 300M steel International Journal of Fatigue 130, 105346. Pistochini, T.E., Hill, M.R., 2011. Effect of laser peening on fatigue performance in 300M steel. Fatigue & Fracture of Engineering Materials & Structures 34, 521 – 533. Pei- ge, S., Mei, Y., Xian - nib, L., Ji - lai, R., Ren - zhi, W., 1996. Qualitative analysis about effect of shot peening on fatigue limit of a 300M steel under the rotating bending condition. Conference Paper for the Sixth International Conference on Shot Peening, published in The Shot Peener magazine 10, 290 – 295. Louge, J., 2019.Apports des mesures d’auto - échauffement pour l’étude de la fatigue des aciers : effets d’histoire et cisaillement pur. PhD Thesis, ENSTA Bretagne.