On the Constitutive Response of 63/37 Sn/Pb Eutectic Solder

Author:

Skipor A. F.1,Harren S. V.2,Botsis J.2

Affiliation:

1. Corporate Manufacturing Research Center, MOTOROLA, 1301 E. Algonquin Rd., Schaumburg, IL 60196

2. Dept. of Civil and Materials Engineering, The University of Illinois at Chicago, 842 W. Taylor St., Chicago, IL 60607

Abstract

The constitutive response of 63/37 Sn/Pb eutectic solder is studied under uniaxial tension. Stress-strain tests were performed under a wide range of applied strain rate, and creep tests were performed at several levels of applied load. Temperature dependence was ascertained by running the stress-strain and creep tests at various temperatures. With the goal of providing a constitutive description of the eutectic suitable for use in electronics packaging engineering finite element analyses, the material parameters of the phenomenological viscoplasticity model of Bodner and Partom were fit to these experiments as functions of temperature. The experiments described herein also yield important information concerning how many microstructural units must be present in a sample in order for repeatable, isotropic response to be obtained.

Publisher

ASME International

Subject

Mechanical Engineering,Mechanics of Materials,Condensed Matter Physics,General Materials Science

Reference37 articles.

1. Adams, P. J., 1981, “Thermal Fatigue of Solder Joints in Micro-Electronic Devices,” M. S. thesis, Massachusetts Institute of Technology.

2. Arrowood, R., Mukherjee, A., and Jones, W. B., 1991, “Hot Deformation of Two-Phase Mixtures,” Solder Mechanics: A State of the Art Assessment D. R. Frear, W. B. Jones and K. R. Kinsman, eds. The Minerals, Metals & Materials Society, Warrendale, PA.

3. Beek, J. M., 1986, “A Comparison of Current Models for Nonlinear Rate-Dependent Material Behavior of Crystalline Solids,” M.S. thesis, Texas A&M University.

4. Bodner S. R. , PartomI., and PartomY., 1979, “Uniaxial Cyclic Loading of Elastic-Viscoplastic Materials,” ASME Journal of Applied Mechanics, Vol. 46, p. 805805.

5. Bodner S. R. , and PartomY., 1972, “A Large Deformation Elastic-Viscoplastic Analysis of a Thick-Walled Spherical Shell,” ASME Journal of Applied Mechanics, Vol. 39, p. 751751.

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