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Effect of friction and back pressure on the formability of superplastically formed aluminium alloy sheet

Wood, Paul and Qarni, Muhammad Jawad and Rosochowski, Andrzej (2011) Effect of friction and back pressure on the formability of superplastically formed aluminium alloy sheet. In: SheMet Conference 2011, 2011-04-17 - 2011-04-20, Leuven.

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    Abstract

    This paper examines the effect of friction and back pressure on the formability of superplastically formed aluminium alloy AA7475 sheet at the temperature of 517 °C. Several experiments with lubrication and back pressure are performed using a simple box shape tool cavity. The coefficient of Coulomb friction between the formed sheet and tool has been determined indirectly using a finite element model to simulate superplastic forming of the box shape. Typical values determined for all lubricant conditions tested are in the range 0.1 < μ < 0.2. The void growth with strain was determined directly from measurements as a function of back pressure. The results show the application of back pressure at 1 MPa reduces the growth of voids from 7% to 0.3% void volume fraction at a logarithmic thickness strain of 0.65. This paper reports back pressure has a significantly greater role than friction in enhancing the formability of the alloy

    Item type: Conference or Workshop Item (Paper)
    ID code: 30719
    Keywords: aluminium alloy AA7475, , superplastic forming, lubrication, , friction coefficient, back pressure , finite element analysis , FEA, Manufactures, Engineering design
    Subjects: Technology > Manufactures
    Technology > Engineering (General). Civil engineering (General) > Engineering design
    Department: Faculty of Engineering > Design, Manufacture and Engineering Management
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    Depositing user: Pure Administrator
    Date Deposited: 19 Apr 2011 14:00
    Last modified: 07 Sep 2014 18:55
    URI: http://strathprints.strath.ac.uk/id/eprint/30719

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