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October 1997

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Wed, 1 Oct 1997 15:13:30 MST
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     Hello Techniques,

     Does anyone know a measure of stress (physical tension) exerted on
     the copper of the barrel of a PTH at various temperatures ranging
     from -65C to +125C (IPC spec).  Specifically the stress on 10 mil
     drilled PTHs on a .062 board using FR4 material.  If there is a
     mathematical formula (or program) to model these stresses?

     Secondarily  I am interested in comparing the stresses from the
     various testing procedures. These include but are not limited to
     Mil-55110 thermal shock, and the Delco test, fluidized sand bed,
     liquid to liquid, etc.
     Are there papers detailing the actual stresses the board
     undergoes, and what failure modes occur.
        Thanks
             Rich
     ------------------------------------------------------------------
          Richard Olsen                Telephone (602)-232-9154
          Continental Circuits Corp.   Main      (602)-268-3461
          3502 East Roeser Road        Fax       (602)-268-0208
          Phoenix Arizona              Pager     (602)-310-6245
          85040-2905                   Internet  [log in to unmask]
          USA                    I make circuit boards,what do you do?
     ------------------------------------------------------------------

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