http://akrometrix.com/wp-content/uploads/2016/02/FEA-Tuning-with- 
Shadow-Moire-Data.pdf

On May 17, 2018, at 2:00 PM, Robert Kondner wrote:

> Hi,
>
>  Silly question: What is a solder "Smile"? Crack?
>
> Thanks,
> Bob K.
>
> -----Original Message-----
> From: TechNet <[log in to unmask]> On Behalf Of Frank Kimmey
> Sent: Wednesday, May 16, 2018 5:12 PM
> To: [log in to unmask]
> Subject: [TN] Solderjoint elasticity
>
> Can anyone point me in a good direction to learn more about  
> solderjoint
> elasticity with SAC305.
> We are seeing some issues with BGAs when they smile.
> Type 2 fractures and the vendor recommends increasing the solderpaste.
> This seems counter intuitive to me.
> If it was SnPb I would go back and hunt some of Werner's research.
> As it is Lead free I need some direction.
> Any help is appreciated,
> FNK
>
> Frank N Kimmey CID+
> Electrical Engineer/PCB Design
>
> Verifone
> 1400 W Stanford Ranch Road
> Rocklin, CA 95765
> T: 916-625-1818
> M: 916-833-9877
>
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