Hi all,
   We have been working on an issue with a flex circuit that has failed during some vibe testing. The copper is just .5oz. and when looking at the cross section, the copper has some definite cracks that became opens to the circuit, but in the areas that don't have the cracks, the copper looks like gravel on a driveway. It looks like crushed gravel and seems to me to look work hardened  and very grainy. The copper should have been RA type and I wouldn't think it should look like it does, but maybe someone can say for sure? I may be able to provide some pictures off the forum, I need to confirm that first. Thanks in advance.
Later...

Scott Decker - Senior Analyst, Drafting & Design Services CID+ - Electronic Systems Center
UTC AEROSPACE SYSTEMS
3445 S. 5th Street, Suite 170, Phoenix, AZ 85040 U.S.A.
Tel: 602 308 5957  FAX: 602 243 2347
[log in to unmask]<mailto:[log in to unmask]>   www.utcaerospacesystems.com<http://www.utcaerospacesystems.com/>

CONFIDENTIALITY WARNING: This message may contain proprietary and/or privileged information of
UTC Aerospace Systems and its affiliated companies. If you are not the intended recipient please 1) do not disclose, copy,
distribute or use this message or its contents, 2) advise the sender by return e-mail, and 3) delete all copies (including all
attachments) from your computer. Your cooperation is greatly appreciated.
This Document Does Not Contain Export Controlled Technology Or Technical Data.