From my experience in using the flat plate model to design burst disks in a
few actuated systems, we used a circular flat plate to go into testing. The
overall thickness was typically all that needed to be varied. Adhesives and
clamping in the design were also the other first points of design review.
On Fri, Oct 23, 2020, 2:27 PM William Claybaugh <wclaybaugh2@xxxxxxxxx>
wrote:
Having inhaled deeply of the arcana of burst disc sizing; I find that the
entirety of the available math is about sizing the plumbing, not about
design of the burst disc.
For my current actuated burst disc design I have a 1.5" diameter disk that
is clamped at 1.25" diameter. Operating conditions are air at (probably
something better than) -50 degree F (cold soak on the way to 200 Km) and at
an original 125 psia. Using the standard flat plate model I get this to be
0.050" thick disc of 6061-T6 providing a safety factor of 1.43.
If I am going to manufacture my own disk (an assumption worthy of review),
then is it correct to just assume a circular flat plate for initial design,
pending testing?
I will be testing prototype initiators next week; for now I am using an
e-match with a very small bit of nitrocellulose to generate the pressuring
gas. The nitrocellulose is in both "guncotton" and cord form. I expect
the former will be faster but the latter possibly easier to control since
cord length can be directly measured.
All testing will be at a local energetic materials facility...
Bill