The crankshaft of an internal combustion engine
experiences torsional vibrations which become critical at
certain running speeds and can cause overstressing in the
crankshaft, leading to failure in some cases.
The object of this study was to design, construct and
test an instrument to measure these oscillations at one
point...
Dead weight creep tests were conducted on polycarbonate in
order to determine if it is a linear viscoelastic material; or if it is
not, then to determine the feasibility of photoplastic stress freezing.
Secondary objectives were: the determination of the parameters in the
creep compliance of a four element viscoelastic...
A cold trap is a device used to remove certain impurities from
a liquid metal by controlled precipitation of such impurities.
An investigation of the thermal characteristics of laminar flow
in two air-cooled cold traps was made. This investigation showed
that the sodium heat transfer rate is a function of...
Design considerations are presented which apply to all types of
electrical resistance strain gage transducers. While the concepts
apply to mass produced transducers, the information should be most
useful for the engineer or technician who designs one-of-a-kind or
"home-made" transducers.
Errors which affect the accuracy of strain gage transducers are...
A model of an exhaust plume was developed and programmed
on a digital computer. The purpose of the model was to predict the
concentration and size distribution of ice particles produced from
automobile exhaust during arctic conditions. The model accounted
for the nucleation, growth, and freezing of the condensed water...
The determination of failure is complicated when a structural
element is subjected to combined rather than simple stresses. This
is especially true when the principle of superposition does not apply.
For such cases, tests of the element under the expected loads are
required to determine its failure criteria.
In this...
A high volume sampling system, employing Nuclepore filters and
designed for sampling particulate in the plumes from industrial
sources using a light aircraft, is described. The effluent of kraft
paper mills was sampled using this system and then analyzed by
electron microscopy.
Size distributions of particles were obtained at several...