Journal of Electronic Packaging, Vol. 113, pp. 427-430, December 1991

An Improved Procedure For The Determination Of The Elastic Constants Of Component-Lead -Board Assemblies

T.S. Chang, and E. Magrab
University of Maryland
College Park, MD 20742


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 moduli by 4 to 7 percent and the corresponding rigidities by 7 to 13 percent.

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