In order to reduce the cost of manufacturing aluminum structures, the automotive and earth moving industries are looking at lasers, high speed machining, and plasma processes to cut holes and various shapes. Tower Automotive in conjunction with Caterpillar as part of a National Institute of Standards and Technology (NIST) funded program, studied the effects of various hole-making processes on the fatigue life of 6061-T6 aluminum. Another part of this program was to study the effects of various surface treatment procedures to increase the fatigue life by a factor of ten or higher.SAE keyhole specimens were made from 3mm and 6mm thick 6061-T6 aluminum. The center test hole was cut using punch pierce, O2 plasma, 4KW CO2 laser, 3KW YAG laser, and HyDefinition plasma. The fatigue testing indicated punch pierce cut holes had the highest fatigue life, while at almost all stress (load) levels, holes cut with CO2 laser had the lowest fatigue life. Surface roughness analysis agreed in general with this finding.In the second phase of this program, the SAE keyhole specimens were made from 6mm thick 6061-T6. The center test hole was cut using punch pierce and 4KW CO2 laser. These two processes were selected to (1) determine whether the hole conditioning will provide greater improvement in CO2 cut specimens compared to punch pierce cut, and (2) obtain the range of improvement possible. The center test hole in these specimens was treated with traditional shot peening, strain shot peening, laser shot (shock) peening, flow drill, abrasive flow machining, and hole expansion with and without reaming. Fatigue data indicated that the hole-expansion with or without reaming improved the fatigue life by a factor much greater than ten. Laser shot peening improved fatigue life by a factor greater than 7. All other methods provided marginal improvement.


    Zugriff

    Zugriff prüfen

    Verfügbarkeit in meiner Bibliothek prüfen

    Bestellung bei Subito €


    Exportieren, teilen und zitieren



    Titel :

    Effects of Hole Making Processes and Surface Conditioning on Fatigue Behavior of 6061-T6 Aluminum


    Weitere Titelangaben:

    Sae Technical Papers


    Beteiligte:

    Kongress:

    SAE 2000 World Congress ; 2000



    Erscheinungsdatum :

    2000-03-06




    Medientyp :

    Aufsatz (Konferenz)


    Format :

    Print


    Sprache :

    Englisch




    Effects of Hole Making Processes and Surface Conditioning on Fatigue Behavior of 6061-T6 Aluminum

    Thakkar, R. B. / Shah, R. P. / Vanark, V. et al. | British Library Conference Proceedings | 2000


    Effects of hole making processes and surface conditioning on fatigue behavior of 6061-T6 aluminium

    Thakkar,R.B. / Shah,R.P. / Vanark,V. et al. | Kraftfahrwesen | 2000


    Fatigue Behavior of 6061-T6 Aluminum Alloy Plain Specimens

    Goto, M. / DuQuesnay, D. L. / SAE | British Library Conference Proceedings | 1997


    Fatigue Behavior of 6061-T6 Aluminum Alloy Plain Specimens

    DuQuesnay, David L. / Goto, Masahiro | SAE Technical Papers | 1997


    Statistical Characteristics of Fatigue Behavior of a 6061-T6 Aluminum Alloy

    Goto, M. / Miyagawa, H. / Nisitani, H. et al. | British Library Conference Proceedings | 1994