DocumentCode :
2365696
Title :
A Novel Technique for Modeling Solder Joint Failure During System Level Drop Simulations
Author :
Jones, W.K.
Author_Institution :
iDEN Mech. Design Center, Motorola, Ft. Lauderdale, FL
fYear :
0
fDate :
0-0 0
Firstpage :
15
Lastpage :
15
Abstract :
This presentation will describe a newly developed solder model that can accurately predicted solder failure during a full product level drop. Currently, it is not feasible to include a detailed model of the solder ball assembly in a system level drop. Simple calculations show that the mesh count would exceed 10 million nodes just for the solder balls on a typical cellular phone printed circuit board! This has lead to the investigation of various techniques to replace the detailed solder joint model with a computationally simple form. The most promising approach is using an equivalent beam element, whose properties are generated from a detailed model. To ensure the mechanical response of the solder, experimentally obtained rate dependent material properties for lead-free solder data are used, along with a failure criterion based upon the pad finish and solder ball chemistry. Simulations of dynamic 4-pt bend testing have validated this technique and bounded the failure criterion consistent with the literature. Application of the modeling technique has allowed for solder ball failure prediction in fully populated cellular radio drop models and these results will form the basis of this presentation
Keywords :
bending; failure analysis; mobile handsets; solders; bend testing; cellular phone; mesh count; printed circuit board; product level drop; solder ball assembly; solder joint failure; Assembly systems; Cellular phones; Chemical elements; Computational modeling; Environmentally friendly manufacturing techniques; Lead; Material properties; Predictive models; Printed circuits; Soldering;
fLanguage :
English
Publisher :
ieee
Conference_Titel :
Advanced Packaging Materials: Processes, Properties and Interface, 200611th International Symposium on
Conference_Location :
Atlanta, GA
ISSN :
1550-5723
Print_ISBN :
1-4244-0260-3
Type :
conf
DOI :
10.1109/ISAPM.2006.1665977
Filename :
1665977
Link To Document :
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