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Date: | Fri, 10 Jan 2020 07:27:05 -0600 |
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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
>
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