A Visco-Plastic Constitutive Model for 60/40 Tin-Lead Solder Used in IC Package Joints

[+] Author and Article Information
E. P. Busso, M. Kitano, T. Kumazawa

Mechanical Engineering Research Laboratory, Hitachi Ltd., Tsuchiura 300, Japan

J. Eng. Mater. Technol 114(3), 331-337 (Jul 01, 1992) (7 pages) doi:10.1115/1.2904181 History: Received June 21, 1991; Revised January 15, 1992; Online April 29, 2008


A new unified visco-plastic constitutive model for the 60 Sn-40 Pb alloy used in solder joints of surface-mount IC packages and semiconductor devices is proposed. The model accounts for the measured stress-dependence of the activation energy and for the strong Bauschinger effect exhibited by the solder. The latter is represented by a back stress state variable which, in turn, evolves according to a hardening-recovery equation. Based on the observed hardening behavior, it is assumed that the isotropic resistance to plastic flow does not evolve within the deformation range covered in this study (ε< 3 percent). The deformation phenomena associated with the solder’s monotonic and steady-state cyclic responses are accurately predicted for −55°C≦T≦150°C and 8 x 10−2 s−1 ≦ ε ≦ 8 x 10−5 s−1 . The model also predicts well the overall trend of steady-state creep behavior. The constitutive model is formulated within a continuum mechanics framework and is therefore well suited for implementation into finite element or other structural codes.

Copyright © 1992 by The American Society of Mechanical Engineers
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