Deep Cup Forming by Superplastic Punch Stretching of Friction Stir Processed 7075 Al Alloy

Abstract

Multiple overlapping passes of friction stir processing (FSP) were used to cover 80 mm wide region for punch stretching of 7075 Al alloy plate. The forming experiments were performed at 723 K. While a maximum depth of 52 mm (depth/punch diameter not, vert, similar 2.7) could be achieved by punch stretching at a slow strain rate of 10−3 s−1, the maximum depth obtained at a higher strain rate of 10−2 s−1 was 40.4 mm. However, tolerable variations in thickness can be maintained up to a depth of 18.5 mm which is nearly equal to the punch diameter. FEM simulation closely predicts the load and thickness variation till the point of initiation of cavities and instabilities.

Department(s)

Materials Science and Engineering

Sponsor(s)

National Science Foundation (U.S.)
University of Missouri Research Board

Keywords and Phrases

FEM Modeling; Friction Stir Processing; Punch Forming; Superplasticity

International Standard Serial Number (ISSN)

0921-5093

Document Type

Article - Journal

Document Version

Citation

File Type

text

Language(s)

English

Rights

© 2005 Elsevier, All rights reserved.

Publication Date

01 Jan 2005

Link to Full Text

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