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October 2008

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Subject:
From:
"Igoshev, Vladimir" <[log in to unmask]>
Reply To:
TechNet E-Mail Forum <[log in to unmask]>, Igoshev, Vladimir
Date:
Tue, 7 Oct 2008 08:37:27 -0400
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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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