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

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Proceedings of the 17th International Conference on New Trends in Fatigue and Fracture (NT2F 2017)

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Abstract

The paper investigates the effect of key cutting parameters of shoulder milling on the surface structure and fatigue properties of high strength aluminum alloy 7475-T7351. The very advanced milling whole carbide cutter and progressive milling process conditions have been analyzed in the respect of force loading, specific cutting energies, the volumetric surface parameters and fatigue life of thin-walled components used for the dynamically loaded primary aerospace structures. The evaluation of the surface structure of the machined samples prior the fatigue testing and morphologies of the fracture surfaces afterwards was done using the modern optical high-resolution 3D surface microscope ALICONA-IF G4 and Tescan Mira 3GM scanning electron microscope. Cyclic fatigue testing for three loading levels was performed using the axial BISS testing machine with an advanced control of the testing. The results confirmed a statistically significant influence of cutting conditions on the surface structure, however, the material inclusions dispersed in the adherent machined surfaces seems to be the most decisive factor affecting the material integrity that triggers the fatigue crack initiations and propagations. Some unique studies like tensile tests in situ in scanning electron microscopy have been also made.

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Acknowledgements

This research work was supported by the Brno University of Technology, Faculty of Mechanical Engineering, Specific research 2016, with the grant “Research of modern production technologies for specific applications”, FSI-S-16-3717, and by the project CEITEC 2020, LQ1601, Ministry of Education, Youth and Sports of the Czech Republic, and the residual stress analysis was done in cooperation with CANAM infrastructure of Nuclear Physics Institute, Řež near Prague, Czech Republic, and was supported through MŠMT infrastructural projects LM2015056 and LM2015074.

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Authors and Affiliations

  1. Faculty of Mechanical Engineering, Institute of Manufacturing Technology, Brno University of Technology, 2 Technicka, 616 69, Brno, Czech Republic

    Miroslav Piska & Petra Ohnistova

  2. Central European Institute of Technology, Brno University of Technology, Purkyňova 123, 616 00, 616 69, Brno, Czech Republic

    Jana Hornikova

  3. Nuclear Physics Institute, Czech Academy of Sciences Řež, 130, 25068, Řež, Czech Republic

    Charles Hervoches

Authors
  1. Miroslav Piska
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  2. Petra Ohnistova
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  3. Jana Hornikova
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  4. Charles Hervoches
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Corresponding author

Correspondence to Miroslav Piska .

Editor information

Editors and Affiliations

  1. CIITEC-Instituto Politécnico Nacional, Mexico City, Mexico

    Ricardo R. Ambriz

  2. CIITEC-Instituto Politécnico Nacional, Mexico City, Mexico

    David Jaramillo

  3. CIITEC-Instituto Politécnico Nacional, Mexico City, Mexico

    Gabriel Plascencia

  4. Polytech’ Lille, Université des Sciences et Technologies de Lille , Villeneuve-d’Ascq, France

    Moussa Nait Abdelaziz

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Piska, M., Ohnistova, P., Hornikova, J., Hervoches, C. (2018). A Study of Progressive Milling Technology on Surface Topography and Fatigue Properties of the High Strength Aluminum Alloy 7475-T7351. In: Ambriz, R., Jaramillo, D., Plascencia, G., Nait Abdelaziz, M. (eds) Proceedings of the 17th International Conference on New Trends in Fatigue and Fracture. NT2F 2017. Springer, Cham. https://doi.org/10.1007/978-3-319-70365-7_2

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