Machining Variables Influence on the Fatigue Life of End-Milled Aluminium Alloy

Ojolo, S. J.; Orisaleye, Ifeoluwa J.; Obiajulu, Nnaemeka

doi:10.11648/j.ijmsa.20140306.27

Cited by 6 publications

(4 citation statements)

References 13 publications

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“…The increase of the cutting speed caused a decrease of the surface roughness parameters. This result partially confirms the observation of Ojolo et al [17].…”

Section: Discussionsupporting

confidence: 93%

“…The observations from the experimental machining, surface analyses, and fatigue testing confirm similar results as those of Ojolo et al [17] and Novovic et al [18].…”

Section: Discussionsupporting

confidence: 89%

“…Ojolo at al. [17] presented results of the four-point bending fatigue testing of a end-milled specimen of alloy 2024. The important fatigue life increase (from 2.67 × 10 3 to 3.6 × 10 3 cycles to failure) was observed for samples machined with use of higher cutting speeds (from 3.77 m/min to 48.25 m/min).…”

Section: Introductionmentioning

confidence: 99%

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Fatigue Life of 7475-T7351 Aluminum After Local Severe Plastic Deformation Caused by Machining

et al. 2019

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The fatigue properties of thermo-mechanically treated and machined aluminum alloy 7475-T7351 have been studied. The applied advanced machining strategy induced intensive plastic deformation on the machined surface under defined cutting conditions. Therefore, a detailed study of 3D surface topography was performed. Advanced characterization of the material structure and electron back scattered diffraction mapping of selected chemical phases were performed, as well as energy dispersive X-ray analysis of the surface. Advanced mechanical properties of the material were investigated in situ with a scanning electron microscope that was equipped with a unique tensile fixture. The fatigue results confirmed an evident dispersion of the data, but the mechanism of crack nucleation was established. Fracture surface analysis showed that the cracks nucleated at the brittle secondary particles dispersed in the material matrix. The surface topography of samples that had been machined in wide range of cutting/deformation conditions by milling has not proved to be a decisive factor in terms of the fatigue behavior. The incoherent interface and decohesion between the alumina matrix and the brittle secondary phases proved to significantly affect the ultimate strength of the material. Tool engagement also affected the fatigue resistance of the material.

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“…The increase of the cutting speed caused a decrease of the surface roughness parameters. This result partially confirms the observation of Ojolo et al [17].…”

Section: Discussionsupporting

confidence: 93%

“…The observations from the experimental machining, surface analyses, and fatigue testing confirm similar results as those of Ojolo et al [17] and Novovic et al [18].…”

Section: Discussionsupporting

confidence: 89%

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Fatigue Life of 7475-T7351 Aluminum After Local Severe Plastic Deformation Caused by Machining

et al. 2019

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“…It is well known that the machining surface integrity influences strongly the fatigue lifetime of materials, since fatigue micro-cracks initiate always at the surface [12][13][14][15][16][17]. For this reason, several studies have been dedicated to the effects of milling on fatigue behaviour of many materials, particularly aluminium and titanium alloys, and superalloys widely used to manufacture structural parts for aviation and aerospace industries [18][19][20][21][22][23][24][25]. It was proved that residual stresses and surface roughness, particularly, could affect considerably the performance of the milled materials under high cyclic fatigue (HCF) load.…”

Section: Introductionmentioning

confidence: 99%

Influences of up-milling and down-milling on surface integrity and fatigue strength of X160CrMoV12 steel

Laamouri

Ghanem

Braham

et al. 2019

Int J Adv Manuf Technol

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is an open access repository that collects the work of Arts et Métiers ParisTech researchers and makes it freely available over the web where possible. This is an author-deposited version published in: https://sam.ensam.eu Handle ID: .http://hdl.handle.net/10985/18458 To cite this version :Adnen LAAMOURI, Farhat GHANEM, Chedly BRAHAM, Habib SIDHOM -Influences of up-milling and down-milling on surface integrity and fatigue strength of X160CrMoV12 steel Abstract This paper aims to compare the influences of the two peripheral milling modes, up-milling and down-milling, on surface integrity and fatigue strength of X160CrMoV12 high-alloy steel. The experimental investigations showed an important difference between integrity of both milled surfaces. The down-milled surface is lowly work-hardened and well finished (lower roughness), but subjected to tensile residual stresses and severely damaged by folds of metal and short micro-cracks. The up-milled surface is highly work-hardened and subjected to compressive residual stresses, but poorly finished (higher roughness) and damaged by a density of micro-cavities due to carbide extraction. The results of 3-point bending fatigue tests revealed that the fatigue limit at 2 × 10 6 cycles of the up-milled state is largely higher of about 26% in comparison with the down-milled state. The effects of surface integrity induced by each milling mode on fatigue strength were evaluated using a HCF behaviour predictive approach based on Dang Van's multiaxial criterion. The predictive results estimated that the pre-existing micro-cracks play a dominant role in the fatigue strength degradation of the down-milled surface while the other surface effects seem to be lower. On the contrary, the fatigue strength of the up-milled surface is less affected by the pre-existing micro-cavities. The detrimental roughness effect (stress concentration effect) is significantly reduced by the beneficial effects of superficial hardening and compressive residual stresses. So, this study revealed that up-milling is the more appropriate mode for a better surface integrity towards fatigue strength of X160CrMoV12 steel than the down-milling mode.

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A Study of Progressive Milling Technology on Surface Topography and Fatigue Properties of the High Strength Aluminum Alloy 7475-T7351

Píška

Ohnistova

Horníková

et al. 2017

Proceedings of the 17th International Conference on New Trends in Fatigue and Fracture

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Machining Variables Influence on the Fatigue Life of End-Milled Aluminium Alloy

Cited by 6 publications

References 13 publications

Fatigue Life of 7475-T7351 Aluminum After Local Severe Plastic Deformation Caused by Machining

Fatigue Life of 7475-T7351 Aluminum After Local Severe Plastic Deformation Caused by Machining

Influences of up-milling and down-milling on surface integrity and fatigue strength of X160CrMoV12 steel

A Study of Progressive Milling Technology on Surface Topography and Fatigue Properties of the High Strength Aluminum Alloy 7475-T7351

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