A Taguchi design of experiment approach was applied to thermostructural analyses of a gull-wing solder joint assembly. This approach uses a minimum number of finite element analyses to evaluate the impact of solder joint assembly parameters on fatigue life of the assembly. To avoid costly complex modeling efforts for each parametric case study, a commercially available program, MSC/PATRAN’s PATRAN Command Language, was used to automatically create finite element models of a two-dimensional gull-wing solder joint assembly based on nine parameters. Modeling time was dramatically reduced from days to a few minutes for each detailed lead/solder model. Two sets of parametric studies were conducted to evaluate the impact of variation of the six parameters. The analysis results indicate that lead ankle radius is the most critical parameter affecting solder joint total fatigue life, and lead and minimum solder thicknesses are the next most critical ones. Therefore, to effectively improve the solder joint fatigue life margin, it is recommended to: (1) increase the minimum solder thickness; (2) use thinner lead; and (3) use a larger lead ankle radius, even though this may require reducing lead shin length. By implementing only the last recommendation to modify the current solder joint assembly, the fatigue life margin in this design could, in general, be improved by 27 percent or more.
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e-mail: tewong@admiral.es.hac.com
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September 1997
Technical Papers
Gull-Wing Solder Joint Fatigue Life Sensitivity Evaluation
T. E. Wong,
T. E. Wong
Hughes Aircraft Company, Radar and Communications Systems, 2000 E. Imperial Highway, El Segundo, CA
e-mail: tewong@admiral.es.hac.com
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L. A. Kachatorian,
L. A. Kachatorian
Hughes Aircraft Company, Radar and Communications Systems, 2000 E. Imperial Highway, El Segundo, CA
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B. D. Tierney
B. D. Tierney
MacNeal-Schwendler Corporation, 2975 Redhill Avenue, Costa Mesa, CA
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T. E. Wong
Hughes Aircraft Company, Radar and Communications Systems, 2000 E. Imperial Highway, El Segundo, CA
e-mail: tewong@admiral.es.hac.com
L. A. Kachatorian
Hughes Aircraft Company, Radar and Communications Systems, 2000 E. Imperial Highway, El Segundo, CA
B. D. Tierney
MacNeal-Schwendler Corporation, 2975 Redhill Avenue, Costa Mesa, CA
J. Electron. Packag. Sep 1997, 119(3): 171-176 (6 pages)
Published Online: September 1, 1997
Article history
Received:
July 15, 1996
Revised:
March 1, 1997
Online:
November 6, 2007
Citation
Wong, T. E., Kachatorian, L. A., and Tierney, B. D. (September 1, 1997). "Gull-Wing Solder Joint Fatigue Life Sensitivity Evaluation." ASME. J. Electron. Packag. September 1997; 119(3): 171–176. https://doi.org/10.1115/1.2792230
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