Effects of laser shock peening on the mechanisms of fatigue short crack initiation and propagation of AA7075-T651

Sanchez, AGYou, CLeering, MGlaser, DanielFurfari, DFitzpatrick, MEWharton, JReed, PAS2021-05-252021-05-252020-11Sanchez, A., You, C., Leering, M., Glaser, D., Furfari, D., Fitzpatrick, M., Wharton, J. & Reed, P. et al. 2020. Effects of laser shock peening on the mechanisms of fatigue short crack initiation and propagation of AA7075-T651. International Journal of Fatigue, 143. http://hdl.handle.net/10204/120190142-11231879-3452https://doi.org/10.1016/j.ijfatigue.2020.106025http://hdl.handle.net/10204/12019A laser shock peening (LSP) treatment was performed on AA7075-T651 for maximum fatigue improvement. Surface and microstructural characterisation techniques (micro-hardness, SEM-EBSD, contact-profilometry) showed LSP surface modification was limited, and LSP generated deep compressive residual stresses above - 300 MPa. Fatigue testing showed a two-order magnitude increase in overall life, due to the mechanism of crack initiation changing from surface second-phase particles to subsurface crack initiation dependent on the local stress field. Modelling highlights the sensitive balance between surface roughness (including LSP-induced pits) and residual stress on the micro-mechanism of crack initiation, and how this can be used to maximise fatigue life extension.AbstractenAluminium alloysFatigue initiationMicromechanicsSurface flawsEffects of laser shock peening on the mechanisms of fatigue short crack initiation and propagation of AA7075-T651ArticleSanchez, A., You, C., Leering, M., Glaser, D., Furfari, D., Fitzpatrick, M., ... Reed, P. (2020). Effects of laser shock peening on the mechanisms of fatigue short crack initiation and propagation of AA7075-T651. International Journal of Fatigue, 143, http://hdl.handle.net/10204/12019Sanchez, AG, C You, M Leering, Daniel Glaser, D Furfari, ME Fitzpatrick, J Wharton, and PAS Reed "Effects of laser shock peening on the mechanisms of fatigue short crack initiation and propagation of AA7075-T651." International Journal of Fatigue, 143 (2020) http://hdl.handle.net/10204/12019Sanchez A, You C, Leering M, Glaser D, Furfari D, Fitzpatrick M, et al. Effects of laser shock peening on the mechanisms of fatigue short crack initiation and propagation of AA7075-T651. International Journal of Fatigue, 143. 2020; http://hdl.handle.net/10204/12019.TY - Article AU - Sanchez, AG AU - You, C AU - Leering, M AU - Glaser, Daniel AU - Furfari, D AU - Fitzpatrick, ME AU - Wharton, J AU - Reed, PAS AB - A laser shock peening (LSP) treatment was performed on AA7075-T651 for maximum fatigue improvement. Surface and microstructural characterisation techniques (micro-hardness, SEM-EBSD, contact-profilometry) showed LSP surface modification was limited, and LSP generated deep compressive residual stresses above - 300 MPa. Fatigue testing showed a two-order magnitude increase in overall life, due to the mechanism of crack initiation changing from surface second-phase particles to subsurface crack initiation dependent on the local stress field. Modelling highlights the sensitive balance between surface roughness (including LSP-induced pits) and residual stress on the micro-mechanism of crack initiation, and how this can be used to maximise fatigue life extension. DA - 2020-11 DB - ResearchSpace DP - CSIR J1 - International Journal of Fatigue, 143 KW - Aluminium alloys KW - Fatigue initiation KW - Micromechanics KW - Surface flaws LK - https://researchspace.csir.co.za PY - 2020 SM - 0142-1123 SM - 1879-3452 T1 - Effects of laser shock peening on the mechanisms of fatigue short crack initiation and propagation of AA7075-T651 TI - Effects of laser shock peening on the mechanisms of fatigue short crack initiation and propagation of AA7075-T651 UR - http://hdl.handle.net/10204/12019 ER -24462