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Effect of Friction and Back Pressure on the Formability of Superplastically Formed Aluminium Alloy Sheet

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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.

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Periodical:

Key Engineering Materials (Volume 473)

Pages:

532-539

DOI:

https://doi.org/10.4028/www.scientific.net/KEM.473.532

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Online since:

March 2011

Authors:

Paul Wood, Muhammad Jawad Qarni, Andrzej Rosochowski

Keywords:

Aluminium Alloy AA7475, Back Pressure, Finite Element Analysis (FEA), Friction Coefficient (FC), Lubrication, Superplastic Forming

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© 2011 Trans Tech Publications Ltd. All Rights Reserved

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