Hydraulic system was designed and installed to estimate values of Bulk modulus within the range of
pressure between 20 bar to 230 bar and temperature between 5° C to 90° C; these limits are the widest
range in which it operates hydraulic systems .
In this research the mineral oil (SAE 46) is heated
(indirectly method) and then pressed into a pipe with large thickness compared with internal diameter so
as to ensure that the results will not be affected by the elasticity of the pipe material. The results for the
characteristics‚the pressure and temperature have been indicated by gages installed on the line of
hydraulic circuit while taking readings compressibility through indicator tube. It was concluded that the
temperature of mineral oil have an effective impact on the Bulk modulus values even at lower
temperatures lower than 50° C and the sloop (of the relation curve between Bulk modulus and pressure)
is reduced with temperature increase. it was also estimated that values of Bulk modulus are volatileat
pressures less than 100 bar with increasing temperatures for this mineral oil.
This paper aims at investigating the effect of organic matter
content on the engineering properties of the soil.
The effect of the organic matter on both the consistency limits and strength have been investigated. The results show that the organic
matter increases both the plasticity and the strength of soil.
Mathematical formula is presented in which the unconfined
compression strength of the soil is related to the organic matter
content. It was concluded that increasing the organic matter
content increases the displacement corresponding to the maximum shear stress. In addition, the effect of the organic matter has been studied and the results show that the organic matter increases the compressibility of the soil.
Stabilizing the soil with cement has been investigated as well. The
results show that adding the cement to the soil improves the
strength of the soil and decreases its swelling potential.
Depending on the organic matter content, a mathematical formula
is presented to determine the required cement ratio to treat the
soil to decrease its swelling potential.
Lubricant type and concentration play a very important role on metalic powder
characterestics. This research presents the outcomes of an experimental investigation
on the effect of lubricant type and content to the green compressibility, and streng
th
of green pieces produced by adding different amounts (0.5,1,1.5)% and different types
(zinc stearate,graphit,poley phinil alcohol) of lubricant to the iron powder, and mixing
them for one hour in V shape blender ,then pressing them to different densities
(75,80,85)% out of the the theoretica density.