Characterization of Sheet Metal Forming Using Acoustic Emission

[+] Author and Article Information
S. Y. Liang

Department of Mechanical and Aerospace Engineering, Oklahoma State University, Stillwater, OK 74078

D. A. Dornfeld

Department of Mechanical Engineering, University of California, Berkeley, CA 94720

J. Eng. Mater. Technol 112(1), 44-51 (Jan 01, 1990) (8 pages) doi:10.1115/1.2903185 History: Received October 10, 1988; Revised January 17, 1989; Online April 29, 2008


The application of acoustic emission signal analysis for characterization of sheet metal forming operations is discussed in this paper. Two particular sheet metal forming operations are examined: punch stretching and deep drawing. The acoustic emission signal characteristics, including the energy content, the spectral properties, and time series behaviors, as functions of the process state, are experimentally studied. Using plastic work analysis, an analytical relationship between acoustic emission energy rate and punch stretching parameters (punch feed rate, workpiece thickness, punch size, holder diameter, amount of plastic deformation, and workpiece material properties) is developed and supporting experimental results presented. During the forming processes, acoustic emission signal features show strong correlations with punch/workpiece contact, yielding, deformation, flange wrinkling, necking and fracture. Therefore, acoustic emission can be effectively used for in-process monitoring of sheet metal forming operations.

Copyright © 1990 by The American Society of Mechanical Engineers
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