The Influence of Laser Shock Peening on Fatigue Properties of AA2024-T3 Alloy with a Fastener Hole
Round 1
Reviewer 1 Report
The paper investigates the effect of laser shock peening (LSP) on the fatigue strength of holed Al plates. The work is well conceived and the paper is well written. It is suitable for publications provided that the authors address the following major issues:
1) some typos are present throughout the paper which needs grammar revision
2) hole drilling technique must be better described. How are residual stresses corrected for layer removal and plasticity?
3) What is the residual stress field after the introduction of the hole?
4) The authors arbitrarily assume that the peak in resonant frequency corresponds to the crack initiation. Can the authors provide experimental evidences for that, for instance through microscopic inspections? What is a plausible explanation for the initial increment in frequency? What is the cause of resonant frequency difference between peened and peened sample shown in Fig. 8 (86 vs 87.5 Hz)?
5) How was the stress amplitude of 110 MPa selected?
6) I fear that such stress level was chosen to accelerate the fatigue tests but in this way the authors explore of the effect of LSP only on the medium cycle fatigue regime. Some papers [1,2] attest that the benefit of compressive residual stresses can be lost, at leat partially, moving towards very high cycle fatigue regime. Please discuss and envisage possible future investigations
References
[1] Int J Fatigue 2016;93:133–147
[2] Int J Fatigue 2015;70:451– 62
Author Response
Please see the attachment
Author Response File: 
Author Response.pdf
Reviewer 2 Report
Changes which must be made before publication:
Abstract
- Abstract should contain maximally 150 words.
- It is necessary to add research goals.
- Abbreviations should be omitted from the abstract.
- Keywords should be ranked according to their importance.
Introduction
- Each reference should be written separately.
- For each reference it is necessary to state way of research and findings.
- If several references are stated together only the most important one should be given.
- Old references should be replaced by more recent journal paper reference from this topic.
- References should be written in accordance with guidelines.
- Number of references should be reduced.
Experimental
- Experimental system should be added in block scheme with input-output data as well as suitable explanation in the text given.
- The item "Results and discussions" should be separated in item "Results" and item "Discussion".
Conclusion
- Conclusions are too general.
- It is necessary to state concrete findings in the given research.
- It is necessary to compare results obtained with results from references.
Confidential comments for the editor:
- Paper needs minor
Author Response
Please see the attachment.
Author Response File: Author Response.pdf
Round 2
Reviewer 1 Report
The authors addressed the paper according to reviewers' indications and is now suitable for publication
