Hi Ioan,
I am with Vladimi—most likely started as overload continued as fatigue.
Werner
-----Original Message-----
From: Ioan Tempea <[log in to unmask]>
To: [log in to unmask]
Sent: Tue, Apr 27, 2010 9:23 am
Subject: Re: [TN] Failure fatigue photos
Victor,
Zero rework, part is socket http://www.tycoelectronics.com/catalog/pn/en/5-316365-0?RQPN=5-316365-0
, the IMC thickness has not been measured
And thank you Guenter, the lack of compliancy of this component has been
mentioned during design review. I'm so proud of myself...
Best regards,
Ioan Tempea, ing.
Ingénieur Principal de Fabrication / Senior Manufacturing Engineer
T | 450.967.7100 ext.244
E | [log in to unmask]
W | www.digico.cc
N'imprimer que si nécessaire - Print only if you must
-----Message d'origine-----
De : Victor Hernandez [mailto:[log in to unmask]]
Envoyé : April-27-10 9:12 AM
À : [log in to unmask]
Objet : Re: [TN] Failure fatigue photos
What type of component is this and what is the thickness of the IMC layer, any
associated rework on the device.
-----Original Message-----
From: TechNet [mailto:[log in to unmask]] On Behalf Of Ioan Tempea
Sent: Tuesday, April 27, 2010 8:00 AM
To: [log in to unmask]
Subject: [TN] Failure fatigue photos
Dear Technos,
It looks like, for the first time, I have the occasion to look at fatigue failed
joints. The lab analysis we've got states this, but does not abounds in details.
One of the conclusions is "the crack propagates around harder Sn shearing the
softer Pb, but the Sn and Pb zones seem fairly large for regular solder
structure". Citing from Klein Wassink "During cyclic plastic deformation the
microstructure inside the material changes in the zones where the deformation is
concentrated. This leads to local grain growth..."
I have deposited the micro-sections on the IPCs website http://ipc-technet.groupsite.com/gallery/13116
I would need your expert opinion regarding the failure. Is this fatigue? The big
pure Sn and pure Pb areas, are they normal size for fatigued joints?
Thanks,
Ioan Tempea, ing.
Ingénieur Principal de Fabrication / Senior Manufacturing Engineer
T | 450.967.7100 ext.244
E | [log in to unmask] <mailto:[log in to unmask]>
W | www.digico.cc <http://www.digico.cc/>
N'imprimer que si nécessaire - Print only if you must
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