Hi Rick,
You may not be aware of this, but elongation measurements for foil specimen
is not a very good technique to determine material ductility. If you run
comparative tests, you will find that the elongation result is very dependent
on testing parameters and technique--thus, it is possible that the high
elongation value is a testing aberration. Also, if you test specimen with
different thickness, you will get the curious result, that the elongation is
thickness dependent; which of course is nonsense. Actual high elongation is
indicative of high ductility; this means you will get neither get corner
cracking nor barrel cracking.

Werner Engelmaier
Engelmaier Associates, L.C.
Electronic Packaging, Interconnection and Reliability Consulting
7 Jasmine Run
Ormond Beach, FL  32174  USA
Phone: 904-437-8747, Fax: 904-437-8737
E-mail: [log in to unmask], Website: www.engelmaier.com

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