Give Hassan Nemat a call @ 972-494-1911. Our company makes stiffeners out of
a variety of materials and are quite knowledgeable in fr4 and the like
expansion problems.
Jim
-----Original Message-----
From: [log in to unmask] <[log in to unmask]>
To: [log in to unmask] <[log in to unmask]>
Date: Tuesday, January 05, 1999 8:06 AM
Subject: [TN] Methods for Stiffening a PWB


All,

We have a current PWB assembly that uses an aluminum stiffener bonded to one
surface for mechanical reasons.  The problem with this is that during
extreme
thermal excursions (as required by the operating environment of the
assembly)
the assembly flexes a great deal due to the expansion mismatch.  Luckily, we
may
have to opportunity to do a re-design of the assembly and move to some
different
method of stiffening.  Our experiences in this subject are very limited, and
would greatly appreciate any options for stiffening a PWB from a board
design
standpoint (i.e.-some type of cored board, other materials either PWB or
stiffener, etc.).

Thanks in advance for your help.

Steve McBride

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