Hi Bev - the statement standing alone is out of context so it could mean a
bunch of things. You would need to know the solder joint configuration and
the what the X/Y/Z stress states to have the sentence make sense. I am
assuming that the report from which the statement was taken would provide
that information.

Dave Hillman
Collins Aerospace
[log in to unmask]

On Thu, Jan 9, 2020 at 7:50 PM Bev Christian <[log in to unmask]>
wrote:

> TechNetters,
>
>
>
> Can someone interpret this sentence for me?
>
> "As Sn is anisotropic, the size and orientation of the grain structure
> contributes to CTE mismatch fractures along the larger axis of a solder
> joint, laterally rather than vertically."
>
>
>
> I know the following:
>
> 1.      Sn is anisotropic
> 2.      the size and orientation of the grain structure contributes to CTE
> mismatch fractures
>
> Is the latter part (.along the larger axis of a solder joint, laterally
> rather than vertically.) always true and if so, why?  What am I missing?
>
>
>
> Regards,
>
> Bev
>