Graham
The copper will let go off the laminate long before intermetalic shear .
That is with properly designed pads , components, & process ( IPC strds,
say )

>----------
>From:  COLLINS, GRAHAM[SMTP:[log in to unmask]]
>Sent:  Wednesday, 4 February 1998 6:23
>To:    [log in to unmask]
>Subject:       solder shear strength
>
>Technetters - I know someone has this information at their fingertips.  I'm
>in an argument with someone about a socket, and I have to prove that a
>gorilla would have to stand on the part to shear the solder joints holding
>the socket on the board (it's a PGA component).  Can someone tell me the
>shear strength of solder?  I'm going to construct a very crude mathematical
>model.
>
>As always, Thanks!
>
>regards,
>
>Graham Collins
>Process Engineer,
>Litton Systems Canada
>(902) 873-2000 ext 215
>
>

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