READ ME File For Data for 'Effects of laser shock peening on mechanisms of short crack initiation and propagation'

Dataset DOI: 10.5258/SOTON/D1616

ReadMe Author: Alvaro Sanchez, University of Southampton [OPTIONAL add ORCID ID]

This dataset supports the publication:
AUTHORS: Sanchez AG, You C, Leering M, Glaser D, Furfari D, Fitzpatrick ME, Wharton J, Reed PAS.
TITLE: Effects of laser shock peening on mechanisms of short crack initiation and propagation
JOURNAL:International Journal of Fatigue

PAPER DOI:


This dataset contains:
Zip content:
Paper 1 data.xlsx: Excel file: Hardness measurements, roughness measurements
Init prop ratio.opju: Origin software file: Ratio of initiation to propagation time for fatigue tests
S-N curve all.opju: Origin software file: All stress vs number of cycles fatigue data
Crack propagation data all.opju: Origin software file: Fatigue crack propagation data
Samling intermetallic distribution.opju: Origin software file: As stated in title.

Require Microsoft excel and Origin Pro Software to access files.

The figures are as follows:

Figure 2 1 .- Schematics of AA7075-T651 plate and LSP sample geometry and LSP area.
Figure 3 1 – Top left: 3-D respresentation of AA7075-T651 microstructural planes.
Figure 3 2 - Centre hole drilling data for LSP samples. S1 in the longitudinal direction, S3 in the transverse direction.
Figure 3 3 – Vickers micro-hardness measurements of baseline LSP samples.
Figure 3 4 – An example of a bend bar surface with pits generated by LSP process. Number of pits per area differs greatly but is generally considered low. Captured by variable focus miroscopy.
Figure 3 5 – EBSD maps of samples cross-sections, LT-ST plane. Surface at the bottom, upwards going away from surface. Left: Baseline. Right: LSP.
Figure 3 6 – Top: Recrystallised fraction graph of baseline and LSP surface for LT-ST cross sections: 0 – 140 µm away from surface. Bottom: Kernel average misorientation vs. distance away from LSP surface.
Figure 3 7 – Stress vs. number of fatigue cycles (S-N) curve. Literature values taken from Jin et al. [36] using WebPlotDigitizer open source software [37]. Erros bars account for fatigue life estimate and variation due to change of load ratio during cycling.
Figure 3 8 – Low and high magnification images of crack initiation sites for different fatigue test conditions. a-b: All baseline tests. c-d: LSP tests at 407 MPa stress range. e-f: One LSP test at 407 MPa which was an exception to the previous tests. g-h: LSP test at 490 MPa stress range. i-j: LSP tests at or above 545 MPa stress range.
Figure 3 9 – Topographical images of both sides of pit acting as initation site of LSP bend bar. Tested at 407 MPa stress range. Failed at 105 cycles. Taken from top surface (L-LT plane).
Figure 3 10 – Crack growth data vs. stress intensity factor for baseline and LSP fatigue tested samples. This includes crack propagation data captured by replica method and the beach marking method.
Figure 3 11 – Crack initiation and crack propagation as a percentage of total life. Baseline (SR range 400), LSP (SR 400 – 595 MPa) and LSP (400 MPa) + pit. Crack initiation is defined as a crack of 50 – 100 µm. Due to the difficulty capturing crack initiation for LSP (SR 400MPa) samples, with and without pits, these have error bars showing an estimate of the minimum crack initiation time. Estimates are based on equivalent tests (not presented in this paper) containing corrosion pits (of approx. 50 µm maximum. depth) and fully characterised crack propagation life.
Figure 4 1 – Finite element model of the chamfered sample with applied mesh pattern and boundary conditions: 3D view of the (a) CAD and (b) meshed model.
Figure 4 2 – Reconstructed compressive residual stress distribution for the LSP sample: (a) contour plot of the longitudinal residual stress S1, (b) comparison between the reconstructed compressive residual stress distribution with centre hole drilling (CHD) data shown in Figure 3 2.
Figure 4 3 – FE-predicted mean stress distributions in baseline and LSP samples at (a) 407 (b) 490 and 595 MPa stress ranges.
Figure 4 4 – FE-predicted plastic strain distribution near the surface of baseline and LSP samples at SR 490 and 595 MPa (no plastic strain is generated in either baseline or LSP samples at SR 360-440 MPa).



Date of data collection: 2017-2020

Information about geographic location of data collection: University of Southampton, United Kingdom

Licence: Unspecified

Relations: Projects: EP/N509747/1 (EPSRC funded)

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