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The spray droplets were deposited over a rotating copper substrate
to achieve a disc shape preform. The thickness uniformity of the
preform was found to depend on the preform distance from the
nozzle, preform offset distance from the axis of the atomizer and
inclination of the preform from the horizontal plane. Mathematical
equations were developed to represent the thickness variation of
the preform with aforementioned parameters. The porosity, hardness,
strength, wear and microstructural studies of the Al-Si-Pb spray
deposited alloys were conducted for different lead content, top to
bottom distance of the deposit and the distance from centre to
periphery of the deposit. Overspray and worn debris particles were
also analyzed. Particles/droplets of two different types were
observed to deposit on the substrate. First type particles were
aluminum rich and second type were lead rich.
Shear and compression wave velocities have been demonstrated to be
quite useful for determining basic engineering properties of the
soil mass by earlier researchers. To achieve this, resonant column,
cyclic triaxial and tortional shear tests have been employed.
However, these methods are not only quite elaborate and expensive
but require skilled manpower, are cumbersome and time consuming.
This calls for development of an alternate methodology that can be
employed for characterizing the soil mass, which is not very
intricate and is cost-effective. In this situation, usage of
piezoceramic elements seems to be a good option. With this in view,
an attempt has been made to develop a simple and cost-effective
methodology for measuring these parameters in different types of
soils, compacted to different compaction states. The suitability of
the methodology has been demonstrated for characterization of the
soil mass for engineering purpose.
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