12 research outputs found
Cavitation Erosion Tests Performed by Indirect Vibratory Method on Stainless Steel Welded Samples with Hardened Surface
The paper presents the results of cavitation erosion tests performed on
two types of samples. The materials of the samples are frequently used
for manufacturing and repairs of the hydro turbines components submitted
to cavitation. The first sample was made by welding of an austenitic
stainless steel on austenito-feritic base material. The second
sample was made similarly with the first but with a martensitic base
material. After the welding processes, on both samples was applied a
hardening treatment by surface peening. The cavitation erosion tests
were performed on vibratory equipment using the indirect method with
stationary specimen. The results show a good cavitation erosion resistance on both samples
Dry Sliding Wear behavior of some Cu and Al Alloys
In this paper, a study concerning the dry sliding wear behavior of three
Cu and Al alloys namely CuSn12, CuAl10Fe3 and AlSi12 was made. For
this three alloys type, all tests have been performed with a tribometer
using the pin-on-disk method (POD) according to the ASTM G99 standard,
where the working conditions (applied load, linear speed, motor
speed and distance) were the same. As an important parameter, the
coefficient of friction (COF) versus time / distance was monitored respective
the wear rate coefficient was calculated. The obtained results
were compared between them, and the specific images were acquired
through a digital microscope and specialized software. In addition, to
these tests, the hardness of these alloys was carried out using a Vickers
microhardness tester
Equation of Motion and Determining the Vibration Mode Shapes of a Rectangular Thin Plate Simply Supported on Contour Using MATLAB
This paper presents the differential biharmonic equation of thin plates through which, the vibration mode shapes for a rectangular thin plate simply supported on contour were obtained. Also, the first four vibration mode and the first four natural frequencies of this rectangular thin plate of steel, were obtained. Using MATLAB software, the vibration mode shapes were graphically represented
Calibration Tests of a Sonotrode and Cavitation Erosion Research through Indirect Cavitation Method for a Steel
This paper content the describe of cavitation erosion stand, especially
the ultrasonic generator; the calibration tests of a oxidable steel
sonotrode and the experimental results for a specimen also from
oxidable steel material tested at cavitation erosion through the indirect cavitation method
Wear Resistance Assessment of Fluoropolymer Coated Gears
Power transmissions that incorporate gears dissipate a significant
amount of energy and noise. Thus, any improvement in their performance
contributes to reducing energy consumption and noise pollution.
In recent years, the opportunities offered by conventional technologies
to increase gear performance have been fully exploited. Therefore, surface
depositions on gear teeth have become increasingly important
technologies in achieving objectives such as: improving energy performance,
providing greater protection against superficial defects, increasing
load capacity and reducing acoustic emissions generated during
operation. However, gear coating technologies have begun to be
developed, but the investigations are still insufficient. In this study, we
carried out wear resistance investigations performed on fluoropolymer
coatings for different working speeds, loads and lubrication conditions.
The results point out that the deterioration rate of the coating increases
with the increase of the working speed and the applied load. In
addition, a slight lubrication, applied at the start of testing, leads to a
noticeable improvement in wear behaviour. This study represents one
step further in understanding the wear process of fluoropolymer coated
gear
Cavitation Erosion Research for AlSi12 Alloy Tested at Different Time Periods
This paper presents cavitation erosion research for 2 batch of an AlSi12
alloy. The tests were made on a cavitation stand in laboratory, using
the stationary specimen method. This alloy is not subject to cavitation,
but the experimental research highlight the behavior of AlSi12 alloy
when the time periods are different. The research results are presented
through graphs and representative images
Cavitation Erosion Research for AlSi12 Alloy Tested at Different Time Periods
This paper presents cavitation erosion research for 2 batch of an AlSi12
alloy. The tests were made on a cavitation stand in laboratory, using
the stationary specimen method. This alloy is not subject to cavitation,
but the experimental research highlight the behavior of AlSi12 alloy
when the time periods are different. The research results are presented
through graphs and representative images
Study Regarding the Good Cavitation Erosion Resistance of a 13Cr-4Ni Stainless Steel used to Manufacture the Components Exposed to Water of the Hydraulic Turbines
This paper presents some information regarding the hydraulic turbines
respectively the experimental results on cavitation erosion behavior of a
13Cr-4Ni stainless steel used to manufacture the components exposed
to water of the Francis, Kaplan and Pelton hydraulic turbines. So, the
presented experimental results of this paper highlight the good cavitation
erosion resistance of the analyzed 13Cr-4Ni stainless steel
Comparative Study on the Cavitation Erosion Resistance Experimental Results of Some Steels Tested through the Cavitation Indirect Method
This paper presents the experimental results of cavitation erosion research
regarding the resistance of some steels. So, the cavitation erosion
researches involve tests of hours for each test. These results are in
tabular form, through charts and pictures presented in this paper
Influence at Work Distance between the Sonotrode and Specimen to Cavitational Erosion
The paper presents the results of cavitation erosion tests performed on
five samples from pure aluminum using the vibratory method with
stationary specimen. The main purpose of this research is for determine
which is the distance between the sonotrode and specimen
favorable for an aggressive cavitational attack. For this, has been calculated
the Mean Depth of Erosion (MDE) and the cavitation erosion rate
(Vec). After that the specific curve for Vec has been analytically processed