[Date Prev][Date Next][Thread Prev][Thread Next][Date Index][Thread Index]

Re: [TCML] hoop stress in primary coil

Lau, Gary wrote:
OK Jim, I'll bite.  What's hoop stress?  Maybe the thing that annihilates the work coil in quarter-shrinkers?

exactly. hoop stress, generically, is the circumferential force on something round (e.g. the stress on the wall of a pressure vessel or pipe is mostly hoop stress)

ANd, yes, that's what causes the work coil on a quarter shrinker to deform/explode.

It's funny, in basic E&M, you cover the fact that a current in a loop causes the coil to want to expand (heck, it was on the Physics AP test back in 1976), but none of the basic texts actually do a numerical example. That tells me it doesn't have a "nice" simple precise analytical solution. (hmm magnetic fields, it's round, the solution probably involves Bessel functions). But, just like the Wheeler formulas, I'm hoping someone has run across a simple approximation.

Tesla mailing list