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Data for 'Effects of laser shock peening on mechanisms of short crack initiation and propagation'
No full textData supporting the paper Sanchez AG, You C, Leering M, Glaser D, Furfari D, Fitzpatrick ME, Wharton J, Reed PAS. "Effects of laser shock peening on mechanisms of short crack initiation and propagation" International Journal of Fatigue. Contains all data</span
Dataset for the publication: 'Effect of ablative and non-ablative laser shock peening on AA7075-T651 corrosion and fatigue performance'
No full textJournal article dataset to support article "Effect of ablative and non-ablative Laser Shock Peening on AA7075-T651 corrosion and fatigue performance" in the journal "Material Science and Technology". The dataset contains
Vicker hardness measuremnets
LSP sample roughness measurements
AA7075 second hole results (residual stress measurements)
Ablative tafel plot all
All OCP graph origin
Combined hole drilling results
CRack propagation data all#
Galvanostatic test comparisons
Initiation propagation ratio
Residual stresses in Origin
S-N curve all data
XRD data</span
Dataset in support of the University of Southampton Doctoral Thesis 'Microstructural engineering for enhanced fatigue performance using laser powder bed fusion' by Anqi Liang.
No full textDataset in support of the University of Southampton Doctoral Thesis 'Microstructural engineering for enhanced fatigue performance using laser powder bed fusion' by Anqi Liang.
This dataset contains the original data of plots in PhD thesis.
Related projects:
Microstructural engineering for enhanced fatigue performance using laser powder bed fusion
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Dataset for the journal article 'Fatigue crack initiation and growth behaviour within varying notch geometries in the low-cycle fatigue regime for FV566 turbine blade material'
No full textThis dataset supports the paper: Fatigue crack initiation and growth behaviour within varying notch geometries in the low-cycle fatigue regime for FV566 turbine blade material published in the journal 'Fatigue & Fracture of Engineering Materials & Structures'.</span
Effect of ablative and non-ablative Laser Shock Peening on AA7075-T651 corrosion and fatigue performance
No full textThe fatigue performance from pre-corroded pits was studied for laser shock peening of aluminium alloy AA7075-T651 (UNS A97075) with and without a protective ablation layer. Surface and microstructural characterisation showed laser shock peening generated high residual stress fields of up to –400 MPa, limited hardness increase, and moderate surface roughness increase. The laser shock peened specimens were exposed to 3.5 wt.% sodium chloride solution for different levels of galvanostatic control. The compressive residual stresses did not significantly affect the corrosion behaviour, corrosion pit morphology or pit depth. Laser-shock-peening-induced surface roughness was shown to have the most detrimental impact on corrosion performance. Fatigue testing of pre-corroded AA7075-T651 showed pits act as stress concentrations, causing cracks to initiate shortly after dynamic loading, and causing a reduction of at least 50% of its fatigue life. The laser shock peening markedly increased fatigue life, by up to 400% compared to corroded untreated AA7075-T651, due to the residual stresses effectively counteracting the stress concentrations produced by these pits. Laser shock peened AA7075-T651, that suffers subsequent pitting corrosion, can be expected to still have fatigue performance and a lifetime equivalent or better than uncorroded unpenened AA7075-T651
Fatigue crack initiation and growth behavior within varying notch geometries in the low-cycle fatigue regime for FV566 turbine blade material
No full textPlain bend bars made from FV566 martensitic stainless steel were extracted from the root of ex-service power plant turbine blades and several industry-relevant notch geometries were introduced. Some of the samples were shot peened. The notched bend bars were loaded plastically in the low-cycle fatigue regime and finite element (FE) modeling carried out to investigate the effects of changing notch geometry, combined with shot peening, on fatigue behaviors such as crack initiation, short crack growth, and coalescence. Shot peening damaged the notch surface, accelerating initiation behaviors, but had a lifetime-extending effect by retarding short crack growth in all tested notch geometries. At a total strain range higher than 1.2%, the lifetime extension benefit from shot peening was diminished due to compressive residual stress relaxation in the notch stress field. Notch geometry (and the associated varying constraint levels and stress/strain gradients) was found to have no notable difference on fatigue life when tested at identical notch-root strain ranges.</p
Fatigue crack propagation in 15-5PH/316L bi-material steels fabricated by laser powder bed fusion
Full text linkMulti-material laser powder bed fusion (MM-LPBF) offers the possibility of components with material and compositional complexity, as well as the geometric complexity for which additive manufacturing is known. LPBF materials are susceptible to fatigue failures due to stress concentrating roughness and porosity defects. Understanding fatigue failure processes is therefore important to enable adoption of multi-material parts, and suitable combinations of materials may offer a strategy to enhance fatigue performance by resisting crack propagation. This study focused on fatigue crack propagation in 316L/15-5 precipitation hardened (PH) bi-material stainless steels (SS), and the effect of residual stress distribution and yield stress gradient on fatigue crack propagation through the interface. The expected yield stress gradient effect in bi-materials (soft to hard interface) was simulated using FE models, showing a slight shielding effect with a drop in J-integral value. Contour cutting measurements detected a residual stress distribution near the bi-material interface that was tensile in 316L layer and compressive in 15-5PH layer. Fatigue crack propagation rates in bi-materials deviated from those in the corresponding single-material specimens. A relatively small shielding effect due to the yield stress gradient was detected within a short distance of the crack tip from the interface. However, the effects of residual stress were more pronounced and inhibited the crack growth rate by up to 77.8 % in regions of 15-5PH SS under residual compression, which suggesting that MM-LPBF parts can be designed such that the compressive residual stress is positioned to intercept and suppress propagating cracks to improve damage tolerance
Going Beyond Counting First Authors in Author Co-citation Analysis
Full text linkThe present study examines one of the fundamental aspects of author co-citation analysis (ACA) - the way co-citation
counts are defined. Co-citation counting provides the data on which all subsequent statistical analyses and mappings
are based, and we compare ACA results based on two different types of co-citation counting - the traditional type that
only counts the first one among a cited work's authors on the one hand and a non-traditional type that takes into
account the first 5 authors of a cited work on the other hand. Results indicate that the picture produced through this non-traditional author co-citation counting contains more coherent author groups and is therefore considerably clearer. However, this picture represents fewer specialties in the research field being studied than that produced through the traditional first-author co-citation counting when the same number of top-ranked authors is selected and analyzed. Reasons for these effects are discussed
Mechanisms of laser shock peening residual stress and the influence on life enhancement
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