Darcy,
I don't think that you will find anything defining stresses like you
are talking about except to say they are very unacceptable.
For a design such as you describe I would think that the board(s) would
have to be somewhat floating within the enclosure on a non-rigid attachment
system. As for your connections between boards, that would be easy to
accomplish safely with wired/flex connections of some form. Otherwise your two
boards could easily crack solder joints on those connectors. Another
alternative for using rigid connectors would have the PCBs rigidly supported
with respect to each other while both floating (non-rigid) within the external
enclosure.
In some mobile applications for computers and telco equipment, they
actually use an internal cage suspended between tensioned springs. That is the
sort of thing it sounds like you need or something with soft neoprene/silicon
type bushings.
Sincerely,
Brad Velander
Senior PCB Designer
Northern Airborne Technology
1925 Kirschner Rd.,
Kelowna, BC, V1Y 4N7.
tel (250) 763-2329 ext. 225
fax (250) 762-3374
-----Original Message-----
From: Darcy Davis [mailto:[EMAIL PROTECTED]
Sent: April 18, 2005 10:54 AM
To: Protel EDA Discussion List
Subject: RE: [PEDA] Mechanical Stresses on PCBs
Actually, to clarify, I'm not concerned about shock/vibration. The enclosure
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.
Thanks again to everyone!
Darcy
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