PSI - Issue 72

Mariia Bartolomei et al. / Procedia Structural Integrity 72 (2025) 135–140

140

 The numerical simulation of the LSP regime was performed to visualize the residual stress field in the treated specimen after loading and to give the interpretation of the experimentally observed improvement of the fatigue life.  The numerical results have shown that the chosen treatment regime let us avoid the formation of the tensile stress at the middle section of the sample notch. LSP allows to generate residual stresses without significant changes in the structure of the material. As a result of a mechanical problem solution, the generated residual stresses act as an additional loading (unloading). The results obtained in this work confirm this effect. At constant stress amplitude, LSP leads to an increase in the fatigue life of the specimen. However, if the created residual stresses are compensated by additional external load in the region of fatigue crack initiation, the fatigue life returns to its previous value. Acknowledgements The study was made in the framework of the government task, registration number of the theme 124020700047-3. References Askar’yan, G., Moroz, É., 1962, Pressure on Evaporation of Matter in a Radiation Beam. Sov. J. Exp. Theor. Phys 43, 1962, 2319 – 2320 White, R., 1963, Elastic wave generation by electron bombardment or electromagnetic wave absorption. Journal of Applied Physics 34, 2123 – 2124 Peyre, P., Fabbaro R., 1995, Laser shock processing: A review of the physics and applications. Opt. Quant. Electron. 27, 1213 – 1229, DOI: 10.1007/BF00326477 Peyre, P., Scherperee, X., Berthe, L., Fabbro, R., 1998, Current trends in laser shock processing. Surface Engineering 14(5), 377 – 380, DOI: 10.1179/sur.1998.14.5.377. Clauer, A., 2019. Laser shock peening, the path to production. Metals 9(6), 626. DOI:10.3390/met9060626 Clauer, A., 2009. A historical perspective on laser shock peening. Met. Finish. News 10, 5 – 6 Pan, X., Li, X., Zhou, L., Feng, X., Luo, S., He, W. 2019, Effect of residual stress on S-n curves and fracture morphology of Ti6Al4V titanium alloy after laser shock peening without protective coating. Materials (Basel) 12(22), 3799. DOI:10.3390/ma12223799 Ouyang, P., Luo, X., Dong, Z., Zhang, S., 2022, Numerical prediction of the effect of laser shock peening on residual stress and fatigue life of Ti 6Al-4V titanium alloy. Materials (Basel) 15(16), 5503. DOI:10.3390/ma15165503 Cao, Z., Xu, H., Zou, S., Che, Z., 2012, Investigation of surface integrity on TC17 titanium alloy treated by square-spot laser shock peening. Chin. J. Aeronaut 25, 650 – 656 Kallien, Z., Keller, S., Ventzke, V., Kashaev, N., Klusemann, B., 2019, Effect of laser peening process parameters and sequences on residual stress profiles. Metals 9, (2019), 655. DOI:10.3390/met9060655 Sun, R., He, G., Bai, H., Yan, J., Guo, W. 2022, Laser shock peening of Ti6Al4V alloy with combined nanosecond and femtosecond laser pulses. Metals 12, 26. DOI:10.3390/met12010026 Achintha, M., Nowell, D., 2014, Residual stress in geometric features subjected to laser shock peening. Proceedings of the Institution of Mechanical Engineers, Part C: Journal of Mechanical Engineering Science 229(11), 1923 – 1938. https://doi.org/10.1177/0954406214550511 Bartolomei, M., Kudryashev, I., Sabirov, R., Korsunsky, A., 2025, Numerical study of residual stress fields after double-sided symmetric laser shock peening of blade edge. Fracture and Structural Integrity 19(72), 26 – 33. DOI:10.3221/IGF-ESIS.72.03 Vshivkov, A, Izyumova, A., Gachegova, E., et al., 2024, Crack Propagation Under Residual Stress Field Induced by Laser Shock Peening. Russian Physics Journal 67 (9), 1449-1455. DOI:10.1007/s11182-024-03267-1 Rendler, N., Vigness, I., 1966, Hole-drilling strain-gage method of measuring residual stresses. Experimental Mechanics 6, 577 – 586. DOI:10.1007/BF02326825