The effects of ultrasonic nanocrystal surface modification (UNSM) on residual stresses and fatigue crack initiation were investigated in various engineering alloys. It was found that higher contact force and smaller pin in UNSM produced higher compressive residual stresses at the surface and subsurface of the alloys. The compressive residual stresses were found to be higher in high yield strength alloys. A deeper compressive residual stress field was observed in alloys with higher elastic modulus and strain hardening exponent. Fatigue crack initiation was found to occur subsurface in the material where the effect of UNSM hardening was saturated. It was concluded that deeper UNSM hardening produces higher fatigue life.
|Number of pages||12|
|Journal||Fatigue and Fracture of Engineering Materials and Structures|
|Early online date||19 Oct 2017|
|Publication status||Published - Apr 2018|
Bibliographical noteThis is the peer reviewed version of the following article: Khan, K, Fitzpatrick, M, Wang, QY, Pyoun, YS & Amanov, A 2017, 'Effect of ultrasonic nanocrystal surface modification on residual stress and fatigue cracking in engineering alloys' Fatigue and Fracture of Engineering Materials and Structures, vol 41, no. 4, pp. 844-855, which has been published in final form at https://dx.doi.org/10.1111/ffe.12732. This article may be used for non-commercial purposes in accordance with Wiley Terms and Conditions for Self-Archiving.
- Residual Stress
- Fatigue Life Improvement
- Ultrasonic Nanocrystal Surface Modification
- Finite Element Analysis