"kenneth collins" <kenneth.p.collins at worldnet.att.net> wrote in message
news:97Ece.672067$w62.377232 at bgtnsc05-news.ops.worldnet.att.net...
The the way that the general operational-stress
histories of the Shuttles correlates with the on-
sets of the two catastrophic failures of Shuttles
also points to a cork-correlated creeping-onset
of systematic fatigue within the structures of the
What's happening is that frame members, and
their interconnections are 'moving away from'
their engineered tolerances, which allows the
Shuttles' structures to flex to commensurate
degrees beyond engineered-in tolerances,
which allows resonances to both augment and
"wander" [become progressively-displaced],
and, thus, interact in new-to-each-Shuttle ways
upon each Shuttle's lift-offs.
This happens in ways that're exactly-analogous
to the ways in which accumulating stresses and
strains in automobiles, as they age, become in-
creasingly-accumulating "creaking", "banging",
"clanging", "rattling", etc., that emmanate from
cars as they accumulate use.
[It's worth looking into the definition of "rattling":
"To make or emit a quick succession of short
percussive sounds." [American Heritage Diction-
ary]. This definition is literally a verbal "picture"
of the result of connection-points having be-
come worn beyond tolerance, which results in
connectors', and, hence, structural members,
moving increasingly, as the connection-points
become increasingly-worn [as the "holes"
through which "bolts", etc., pass increase in
'diameter' augmentingly]. It's an easily-repli-
cated phenomenon which, in fact, occurs
whenever there is physical energy-exchange.
It's why the tips of your screw-drivers become
worn the more you use them, for instance :-]
=ALL= 'systems', including 'the' Human system,
exhibit such "creeping"-fatigue -- be-cause it's
a fundamental consequence of the Fact that
the energy-flow that is WDB2T both permeates
the Universe and empowers all physical Action
The "wearing-out" is 'just' WDB2T, and, in the
differential "wearings-out" of various materials,
one can see, follow, and replicate all of Science
It's Fun to explore this general Problem, but in
the the Shuttles' cases, it's Critical that the on-
set of "creeping"-fatigue's passing-through vib-
rational-thresholds be both comprehended
I don't know what sensors are onboard the
Shuttles -- inertial-vibration-detectors would
be best -- but if there're any sound-recording
"histories" of Shuttle lift-offs and landings,
these'd certainly disclose the creeping-fatigue
in their progressive, flight-to-flight differences.
This stuff is Critical. It =MUST= be sorted-
out as exactly as is possible.
Another way to do it would be to test the
Shuttles of "vibration tables".
Observer: "Oh sure, Ken. Double the stress
through such testing."
The stresses and strains happen during lift-
off, anyway. And a 50% margin of safety
is relegating both the Lifes of the Astro-
nauts and the Shuttle Program to 'Chance',
isn't it? Yup. And it's not necessary to
test at lift-off intensities to monitor the
Shuttles' structures for "wandering"-res-
onances - intensity can be reduced in ways
that're proportional to the monitoring in-
strumentation's sensitivity, which can be
made very-great, on the ground, because
"weight" of the monitoring apparatus isn't
a problem. It'd be something like a whole-
Shuttle "sonogram", only what's of partic-
ular interest is what's =not= in-there, vs.
what should be in-there. Low-intensity
vibrations wouldn't disclose full-stress
resonances, but they would disclose the
"creepingness" -- and, if the "creepingness"
is in-there at low-intensity, then it's in-
there, to proportionately greater degree,
at increasing intensities -- fundamentally,
it's 'just' Classical Mechanics -- Newton's
"Laws of Motion".
Anyway, if the folks at NASA look, they'll
probably find that they've already got
the data that they need [if all data from
Shuttle Flights have been preserved].
Just look for "differentials" correlated with
the Flight-history of each Shuttle.
k. p. collins