Wow,

There appears to be a lot of prepreg, and the same for your resin content.  My
guess is that you had a big CTE in the Z axis.  Your copper elongation hit the
end of its stretch and the copper strength was better than the bond of the pad
to the resin.  The hole is OK so the end  of the pad gets pulled up.

Try to reduce the resin in your construction or use material with a lower CTE.

Chuck Brummer
Acuson
[log in to unmask]

Rajesh Goutham wrote:

> Sorry ,
> I forgot to attach the image.
>
> (See attached file: Pad lift.jpg)
>
> Rajesh
>
>   ------------------------------------------------------------------------
>                       Name: Pad lift.jpg
>    Pad lift.jpg       Type: JPEG Image (image/jpeg)
>                   Encoding: base64
>                Description: JPEG File Interchange

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