The effects of surface pits and intermetallics on the competing failure modes in laser shock peened AA7075-T651: Experiments and modelling
Source abstract
Abstract
Abstract The effects of laser shock peening (LSP) on the fatigue life of AA7075-T651 were investigated. The combined influence of surface imperfections (i.e. pits and intermetallics), compressive residual stresses (CRS) and the applied stress on crack initiation sites (surface or subsurface) and the associated fatigue life were investigated. Critical surface imperfections were found to significantly reduce the benefits of LSP in life improvement, by promoting surface crack initiation despite the resisting effects of CRS. To facilitate quantifying the effects of LSP on fatigue life, a finite element (FE) model was developed to simulate residual stress distribution induced by LSP, as well as its redistribution caused by the formation of surface pits. Based on the FE results, a method identifying whether the specified surfaces pits and intermetallics are critical to lead to surface cracking at given stress conditions was proposed, based on the Smith-Watson-Topper method and the Murakami’s model respectively. The interaction between surface imperfections, CRS and the applied loads were taken into account in this method. In addition, a fatigue life assessment framework was proposed based on the prediction of crack initiation sites, which was validated to be reliable in efficiently evaluating the efficacy of the applied LSP in improving fatigue life.
Source: openaire · Quality: candidate unverified · Source record ↗
Research context
OpenAlex topics: Surface Treatment and Residual Stress · Fatigue and fracture mechanics · Metal Alloys Wear and Properties
SciVX discovery tags are terminology-based. OpenAlex topics are source-provided classifications.
References (45)
Show source-provided references
1. A review of Competing Modes fatigue behavior10.1016/j.ijfatigue.2009.04.018 ↗
2. Fatigue deformation in a polycrystalline nickel base superalloy at intermediate and high temperature: Competing failure modes10.1016/j.actamat.2018.03.035 ↗
3. Effect of surface roughness on step-wise S-N characteristics in high strength steel10.1016/S0142-1123(02)00166-4 ↗
4. Modelling the influence of machined surface roughness on the fatigue life of aluminium alloy10.1016/j.ijfatigue.2008.06.003 ↗
5. The effect of machined topography and integrity on fatigue life10.1016/j.ijmachtools.2003.10.018 ↗
6. Defects as a root cause of fatigue failure of metallic components. II: Non-metallic inclusions10.1016/j.engfailanal.2019.01.054 ↗
7. Defects as a root cause of fatigue failure of metallic components. III: Cavities, dents, corrosion pits, scratches10.1016/j.engfailanal.2019.01.034 ↗
8. Material defects as cause for the fatigue failure of metallic components10.1016/j.ijfatigue.2019.06.024 ↗
9. The effect of manufacturing defects on the fatigue life of selective laser melted Ti-6Al-4V structures10.1016/j.matdes.2020.108708 ↗
10. Influence of defects, surface roughness and HIP on the fatigue strength of Ti-6Al-4V manufactured by additive manufacturing10.1016/j.ijfatigue.2018.07.020 ↗
11. Subsurface crack initiation and propagation mechanism in high-strength steel in a very high cycle fatigue regime10.1016/j.ijfatigue.2005.08.015 ↗
12. Effect of controlled shot peening and laser shock peening on the fatigue performance of 2024–T351 aluminum alloy10.1361/105994903770342944 ↗
13. Takahashi K, Kogishi Y, Shibuya N. and Kumeno F. Effects of laser peening on the fatigue strength and defect tolerance of aluminum alloy. Fatigue & Fracture of Engineering Materials & Structures, 2020.10.1111/ffe.13201 ↗
14. Microstructural characterisation of metallic shot peened and laser shock peened Ti–6Al–4V10.1016/j.actamat.2016.10.044 ↗
15. Recovery of fatigue life using laser peening on 2024–T351 aluminium sheet containing scratch damage: The role of residual stress10.1111/ffe.12981 ↗
16. Low- and high-cycle fatigue resistance of Ti-6Al-4V ELI additively manufactured via selective laser melting: Mean stress and defect sensitivity10.1016/j.ijfatigue.2017.10.021 ↗
17. 3D modeling of subsurface fatigue crack nucleation potency of primary inclusions in heat treated and shot peened martensitic gear steels10.1016/j.ijfatigue.2008.12.001 ↗
18. Do corrosion pits eliminate the benefit of shot-peening?10.1016/j.ijfatigue.2018.07.004 ↗
19. Experimental and numerical investigation of material heterogeneity in shot peened aluminium alloy AA2024-T35110.1016/j.surfcoat.2012.12.046 ↗
20. Effect of laser shock peening on residual stress and fatigue life of clad 2024 aluminium sheet containing scribe defects10.1016/j.msea.2012.04.002 ↗
21. A new approach to correlate the defect population with the fatigue life of selective laser melted Ti-6Al-4V alloy10.1016/j.ijfatigue.2020.105584 ↗
22. Building the Kitagawa-Takahashi diagram of flawed materials and components using an optimized V-notched cylindrical specimen10.1016/j.engfracmech.2019.106810 ↗
23. The Kitagawa-Takahashi fatigue diagram to hybrid welded AA7050 joints via synchrotron X-ray tomography10.1016/j.ijfatigue.2019.04.002 ↗
24. Effects of defects, inclusions and inhomogeneities on fatigue strength10.1016/0142-1123(94)90001-9 ↗
25. Prediction of fatigue limit in additively manufactured Ti-6Al-4V alloy at elevated temperature10.1016/j.ijfatigue.2019.04.025 ↗
26. Effect of ablative and non-ablative Laser Shock Peening on AA7075-T651 corrosion and fatigue performance10.1080/02670836.2021.1972272 ↗
27. Effects of laser shock peening on the mechanisms of fatigue short crack initiation and propagation of AA7075-T65110.1016/j.ijfatigue.2020.106025 ↗
28. Numerical modelling of the fatigue crack shape evolution in a shot-peened steam turbine material10.1016/j.ijfatigue.2017.07.017 ↗
29. Estimating the effects of corrosion pits on the fatigue life of steel plate based on the 3D profile10.1016/j.ijfatigue.2014.11.003 ↗
30. Low cycle fatigue life prediction in shot-peened components of different geometries-part I: residual stress relaxation10.1111/ffe.12543 ↗
31. Eigenstrain modelling of residual stress generated by arrays of laser shock peening shots and determination of the complete stress field using limited strain measurements10.1016/j.surfcoat.2012.11.027 ↗
32. Residual stresses due to foreign object damage in laser-shock peened aerofoils: Simulation and measurement10.1016/j.mechmat.2014.12.001 ↗
33. Microstructure-based multistage fatigue modeling of aluminum alloy 7075–T65110.1016/j.engfracmech.2006.12.031 ↗
34. Fatigue of 7075–T651 aluminum alloy10.1016/j.ijfatigue.2007.07.005 ↗
35. A deviatoric version of the SWT parameter10.1016/j.ijfatigue.2013.12.002 ↗
36. The effect of notch size on critical distance and fatigue life predictions10.1016/j.matdes.2020.109095 ↗
37. The influence of interacting small defects on the fatigue limits of a pure iron and a bearing steel10.1016/j.ijfatigue.2020.105560 ↗
38. On the critical inclusion size of high strength steels under ultra-high cycle fatigue10.1016/j.msea.2006.04.068 ↗
39. Influence of porosity on the fatigue limit of die cast magnesium and aluminium alloys10.1016/S0142-1123(02)00054-3 ↗
40. On the mean stress sensitivity of cast aluminium considering imperfections10.1016/j.msea.2019.04.119 ↗
41. Fatigue limit prediction of A356–T6 cast aluminum alloys with different defect sizes sampled from an actual large-scale component10.1108/IJSI-12-2016-0038 ↗
42. Fatigue limit estimation of aluminum die-casting alloy by means of√ area method10.2472/jsms.63.844 ↗
43. Fatigue behavior of die casting aluminum alloys in air and vacuum10.1016/j.proeng.2010.03.208 ↗
44. Mean stress effects in stress-life fatigue and the Walker equation10.1111/j.1460-2695.2008.01322.x ↗
45. Mean stress and plasticity effect prediction on notch fatigue and crack growth threshold, combining the theory of critical distances and multiaxial fatigue criteria10.1111/ffe.12910 ↗