An Improved Procedure for the Determination of the Elastic Constants of Component-Lead-Board Assemblies

[+] Author and Article Information
T. S. Chang

CALCE Center for Electronic Packaging

Edward B. Magrab

Department of Mechanical Engineering, University of Maryland, College Park, MD 20742

J. Electron. Packag 113(4), 427-430 (Dec 01, 1991) (4 pages) doi:10.1115/1.2905432 History: Received June 01, 1991; Revised September 25, 1991; Online April 28, 2008


An improved means of obtaining the elastic constants of component-lead-board assemblages from two three-point bending tests and one four-point torsion test is proposed. The suggested method models the three-point bending test as an orthotropic plate and uses the experimentally obtained bending and torsion results in a standard nonlinear least square procedure to determine the rigidities in the x and y directions and the Poisson’s ratios directly. Numerical simulation of the method indicates that the beam model overestimates the elastic modulii by 4 to 7 percent and the corresponding rigidities by 7 to 13 percent.

Copyright © 1991 by The American Society of Mechanical Engineers
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