Well, Cu can be very ductle, but whether necking wil occur or not depends on a lot of things. In case of barrel cracks it can become even more complicated as the quality of plating can make it look as necking.
Regards,
Vladimir
----- Original Message -----
From: TechNet <[log in to unmask]>
To: [log in to unmask] <[log in to unmask]>
Sent: Tue Oct 07 08:27:57 2008
Subject: Re: [TN] Barrel and Corner cracks in copper elctroplating
Oh yes I find the copper is plastically deformed and it appears that is
happening here. Look for a thinning right at the break site. With fast
onset catastrophic type failures thinning is frequently observed. Copper
thinning is s very subtle condition however and is usually over looked.
You know there is a lot more to be said about barrel cracks, crack
propagation, roots causes etc. and not enough time to do so in this
forum. I just try to hit the major points.
Sincerely,
Paul Reid
Program Coordinator
PWB Interconnect Solutions Inc.
235 Stafford Rd., West, Unit 103
Nepean, Ontario
Canada, K2H 9C1
613 596 4244 ext. 229
Skype paul_reid_pwb
[log in to unmask] <mailto:[log in to unmask]>
-----Original Message-----
From: TechNet [mailto:[log in to unmask]] On Behalf Of Werner Engelmaier /*
Sent: Tuesday, October 07, 2008 4:43 AM
To: [log in to unmask]
Subject: Re: [TN] Barrel and Corner cracks in copper elctroplating
Hi Paul,
Inward bowing of the barrel walls certainly occurs. However, in order to
cause cracks like these, the copper would have to plastically deform and
stay bowed. I did not see this.
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