Consideration of Parameter Scattering in Thermo-Mechanical Characterization of Advanced Packages

[+] Author and Article Information
T. Winkler

Chemnitzer Werkstoffmechanik GmbH, P. O. Box 344, Annaberger Str. 240, D-09003 Chemnitz, Germany

A. Schubert, E. Kaulfersch, B. Michel

Fraunhofer Institute for Reliability and Microintegration, Department of Mechanical Reliability and Micro Materials, Berlin, Germany

J. Electron. Packag 121(4), 282-285 (Dec 01, 1999) (4 pages) doi:10.1115/1.2793853 History: Received February 26, 1990; Revised May 27, 1999; Online November 05, 2007


Much progress has been made in the simulation and verification of the thermo-mechanical behavior of plastic packages. On the other hand, until now there is a lack in the consideration of the scatter or uncertainty, respectively, of certain characteristics. A comparatively large scatter of local material properties or random geometrical imperfections can often be observed within the material compounds of electronic packages. The partial randomness of certain input parameters creates uncertainties in the finite element determination of mechanical quantities which are provided for thermo-mechanical reliability optimization and life time prediction. In the following the STOFEM stochastic finite element approach based on perturbation theory is applied as a part of the finite element simulation. It is used to find out some additional effects arising from uncertainties in the modeling, slightly varying parameters or probabilistic influences, respectively. In a second part of the paper, another approach to the consideration of random variations is discussed. It is based on the randomization of initially deterministic relations.

Copyright © 1999 by The American Society of Mechanical Engineers
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