Darcy Davis wrote:
Actually, to clarify, I'm not concerned about shock/vibration. The enclosurePCB's are remarkably tolerant of one-time deformation. I got some boards once
that these PCBs are to be assembled into may be under such stresses that the
enclosure will deform, in turn deforming the PCBS some amount. The reason I
posted the question is to try find the necessary information so I can
specify what our board can tolerate. My searches thus far have not turned up
any articles on these kinds of stresses.
that looked like potato chips! They would lay on a desk with 2 corners about an
inch in the air! I just bent them over my thigh until they would lay nearly flat.
Never had a problem with them. I have had to bend boards on occasion since,
although NEVER to that degree, and just don't even worry about it much anymore.
Now, this doesn't apply to repeated flexing, which is likely much more serious.
If these boards are being deformed no more than .1" over a few inches length, and
if there are no SMT components really close to the boss that causes the deformation,
I would not worry about it. I have even straightened PCBs AFTER SMT components
were mounted, and still had no problem. And, I have put badly warped SMT boards
(maybe 1/4" out of plane on 2 corners on a 7x11" board) into frames that forced them
to lie flat without any problems. This gear is pretty much all in-house instrumentation,
so if it broke later, it would come back to me.
Jon
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