Cold expansion of holes (cold working) is a fatigue enhancement technique which is used extensively on metallic aircraft components to enhance the fatigue performance of a structural assembly. This paper reports on a new cold expansion tool, developed by EADS Innovation Works. The tool provides a number of potential benefits over the conventionally employed Split Sleeve or Split Mandrel tools. The specific design of the tool enables the control of variable expansion levels which in turn can compensate for hole tolerances and wear entailed changes in tooling diameter thus ensuring the same level of cold expansion for each hole is maintained. Furthermore, the tool generates a more homogeneous strain distribution around the hole which can be used for an extended exploitation of a materials deformation behaviour. This may lead to an optimised and improved cold working of high strength anisotropic Aluminium alloys (e.g. 7xxx series alloys) using higher levels of applied expansion with a reduced risk of crack formation. There are also additional benefits associated with the tool compared with conventional cold working methods including potential reduced manufacturing costs and also the ability to cold work hybrid stacks in-situ (e.g. aluminium/cfrp) whereby only a portion of the hole requires cold expansion for fatigue life improvement (e.g. cold expand aluminium part of stack only).


    Zugriff

    Zugriff über TIB

    Verfügbarkeit in meiner Bibliothek prüfen

    Bestellung bei Subito €


    Exportieren, teilen und zitieren



    Titel :

    The variable expansion process - a new cost efficient method for cold working fastener holes in aluminium aircraft structures


    Beteiligte:


    Erscheinungsdatum :

    2009


    Format / Umfang :

    10 Seiten, 8 Bilder




    Medientyp :

    Aufsatz (Konferenz)


    Format :

    Print


    Sprache :

    Englisch




    The variable expansion process - A new cost efficient method for cold working fasterner holes in aluminium aircraft structures

    Reese, E.D. / Dowson, A.L. / Jones, T.G.B. | British Library Conference Proceedings | 2009



    Life enhancement of fatigue-aged fastener holes using the cold expansion process

    Gaerke, J / Zhang, X / Wang, Z | SAGE Publications | 2000



    Experimental measurement of strain changes around fastener holes during cold expansion

    Backman, David / Rutledge, Robert / Yanishevsky, Marko | Tema Archiv | 2006