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41:51 1997 |
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You gotta have stress relief - see Appendix C of J-STD-001B
>Dimensional stability -- a related question ... does anyone have experience
>with staking high profile components [leaded devices, installed in plated
>thru holes, leads cinched over on the back side of the board]? We are
>thinking of staking with an epoxy adhesive. We are trying to find a way to
>secure the components to keep the thermal movement of the encapsulant from
>pulling the parts out of the boards. Any similar experiences?
>
>Related to the original question about using strain gauges, have you
>considered thermomechanical analysis for looking at the behavior of your
>typical materials @ reflow temperatures? TMA measures dimensional changes
>over temperature and can be used from -160 to 1200C. It is very useful for
>determining Tg & CTE also. If you contact me directly, I can furnish names
>of several labs that do TMA.
>
>S. Smith
>Tracor Aerospace Electronic Systems
>
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