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 -----Original Message----- From: [EMAIL PROTECTED] [mailto:[EMAIL PROTECTED] Behalf Of Seim, Thomas A Sent: April 18, 2005 9:33 AM To: Protel EDA Discussion List Subject: RE: [PEDA] Mechanical Stresses on PCBs If you don't specify what your shock/vibration environment is, and what your board will tolerate, any response is, at best, a generalized guess. -----Original Message----- From: [EMAIL PROTECTED] [mailto:[EMAIL PROTECTED] On Behalf Of Darcy Davis Sent: Thursday, April 14, 2005 7:50 AM To: PEDA (E-mail) Subject: [PEDA] Mechanical Stresses on PCBs Hey Guys, One of the latest issues we've run across (while trying to balance weight, size, money) in a current design is that there is some potential for mechanical stresses to be induced into the PCBs in the end user product. This causes a couple issues. The first is the obvious solder joint integrity and the possibility of damaging components or traces on each PCB. The second is the alignment of a board to board connector (Hirose DF12 series) between two PCBs. My first gut reaction is "absolutely no stresses are acceptable in the PCB," but since we're balancing the above objectives, I thought I'd throw some questions out. 1) Has anybody got an opinion or has read some article on allowable stress or flexure of populated PCBs? 2) Have you seen any sort of flexible mount that could be used to "float" the PCBs. Currently we're using 3mm screws to secure the PCBs so we're looking for a solution that would be the same order of magnitude in size (ie. Chev 454 motor mounts are too big!) Thanks for any suggestions you may have. Darcy Davis Design Engineer, Dynastream Innovations, Inc. ____________________________________________________________ You are subscribed to the PEDA discussion forum To Post messages: mailto:[email protected] Unsubscribe and Other Options: http://techservinc.com/mailman/listinfo/peda_techservinc.com Browse or Search Old Archives (2001-2004): http://www.mail-archive.com/[email protected] Browse or Search Current Archives (2004-Current): http://www.mail-archive.com/[email protected] ____________________________________________________________ You are subscribed to the PEDA discussion forum To Post messages: mailto:[email protected] Unsubscribe and Other Options: http://techservinc.com/mailman/listinfo/peda_techservinc.com Browse or Search Old Archives (2001-2004): http://www.mail-archive.com/[email protected] Browse or Search Current Archives (2004-Current): http://www.mail-archive.com/[email protected]
____________________________________________________________ You are subscribed to the PEDA discussion forum To Post messages: mailto:[email protected] Unsubscribe and Other Options: http://techservinc.com/mailman/listinfo/peda_techservinc.com Browse or Search Old Archives (2001-2004): http://www.mail-archive.com/[email protected] Browse or Search Current Archives (2004-Current): http://www.mail-archive.com/[email protected]
