scholarly journals Determination of degradation level during cavitation erosion of zircon based ceramic

2017 ◽  
Vol 49 (2) ◽  
pp. 175-185 ◽  
Author(s):  
Marko Pavlovic ◽  
Marina Dojcinovic ◽  
Sanja Martinovic ◽  
Milica Vlahovic ◽  
Zoran Stevic ◽  
...  
Keyword(s):  
Mass Loss ◽  
Thermal Imaging ◽  
Cavitation Erosion ◽  
Mechanical Shock ◽  
Cavitation Resistance ◽  
Material Degradation ◽  
Surface Degradation ◽  
Erosion Testing ◽  
Erosion Environment

Mechanical shock of zircon based ceramic induced by cavitation erosion testing was investigated in this study. Several parameters were followed in order to determine level of material degradation during the cavitation erosion testing. Mass loss was taken as a conventional criterion for material degradation, while the level of surface degradation was evaluated by image and thermal imaging analyses. Results show high cavitation resistance of zircon ceramics and their suitability when vigorous cavitation erosion environment is expected.

scholarly journals The use of image analysis for determination of surface deterioration level of improved alumina based materials subjected to cavitation

2013 ◽  
Vol 45 (1) ◽  
pp. 97-105 ◽  
Author(s):  
M.M. Dimitrijevic ◽  
M. Dojcinovic ◽  
A. Devecerski ◽  
R. Jancic-Heinemann ◽  
T. Volkov-Husovic
Keyword(s):  
Mechanical Properties ◽  
Mass Loss ◽  
Cavitation Erosion ◽  
Surface Erosion ◽  
Resistant Material ◽  
Good Resistance ◽  
Erosion Rates ◽  
Set Up ◽  
Different Content

Alumina based specimens having different content of alumina based fibers were investigated for possible application as cavitation resistant material. Cavitation damages of the alumina based specimens were tested by the modified vibratory cavitation set up. Erosion rates were measured based on the method developed for metallic samples, mass loss was measured during the experiment. Surface erosion was determined during the experiment simultaneously to mass loss measurements. Image Pro Plus Program was applied for surface analysis during testing. Results indicate that investigated material exhibit excellent mechanical properties and very good resistance to cavitation erosion.

scholarly journals Cavitation erosion degradation of Belzona® coatings

2017 ◽  
Vol 17 (1) ◽  
pp. 22-33
Author(s):  
Ł. Bolewski ◽  
M. Szkodo ◽  
M. Kmieć
Keyword(s):  
Mass Loss ◽  
Steel Surface ◽  
Cavitation Erosion ◽  
Superior Performance ◽  
Distilled Water ◽  
Cavitation Resistance ◽  
Maritime Industry ◽  
Drilling Mud ◽  
P110 Steel ◽  
High Elasticity

Abstract In hydrocarbon and maritime industry there is a constant need of materials and coatings withstanding severe conditions. One of adverse phenomena present there is cavitation erosion. The paper presents evaluation of cavitation resistance of three different steel coatings. Belzona 2141 (ACR-Fluid Elastormer), 1321 (Ceramic S-Steal) and 5831 (ST-Barrier) were deployed on P110 steel and subjected to ultrasound cavitation in distilled water and drilling mud environment. According to mass loss measurements Belzona 2141 shows superior performance comparing to two other coatings and bare p110 steel surface. This is due to its high elasticity comparing to steel.

scholarly journals Microstructural and Cavitation Erosion Behavior of the CuAlNi Shape Memory Alloy

Metals ◽  
2021 ◽  
Vol 11 (7) ◽  
pp. 997
Author(s):  
Tatjana Volkov-Husović ◽  
Ivana Ivanić ◽  
Stjepan Kožuh ◽  
Sanja Stevanović ◽  
Milica Vlahović ◽  
...  
Keyword(s):  
Shape Memory Alloy ◽  
Mass Loss ◽  
Shape Memory ◽  
Cavitation Erosion ◽  
Optical Microscope ◽  
Water Quenching ◽  
Resistance Testing ◽  
Metallographic Analysis ◽  
Cavitation Resistance ◽  
Cast State

Microstructural and cavitation erosion testing was carried out on Cu-12.8Al-4.1Ni (wt. %) shape memory alloy (SMA) samples produced by continuous casting followed by heat treatment consisting of solution annealing at 885 °C for 60 min and, later, water quenching. Cavitation resistance testing was applied using a standard ultrasonic vibratory cavitation set up with stationary specimen. Surface changes during the cavitation were monitored by metallographic analysis using an optical microscope (OM), atomic force microscope (AFM), and scanning electron microscope (SEM) as well as by weight measurements. The results revealed a martensite microstructure after both casting and quenching. Microhardness value was higher after water quenching than in the as-cast state. After 420 min of cavitation exposure, a negligible mass loss was noticed for both samples. Based on the obtained results, both samples showed excellent cavitation resistance. Mass loss and morphological analysis of the formed pits indicated better cavitation resistance for the as-cast state (L).

scholarly journals Determination of resistance to cavitation of pyrophyllite samples

2021 ◽  
Vol 62 (2) ◽  
pp. 126-134
Author(s):  
Ljubiša Andrić ◽  
Marko Pavlović ◽  
Marina Dojčinović ◽  
Dragan Radulović
Keyword(s):  
Electron Microscopy ◽  
Cavitation Erosion ◽  
Surface Damage ◽  
Test Method ◽  
Test Time ◽  
Cavitation Resistance ◽  
Initial Sample ◽  
Erosion Test ◽  
Scanning Electron

The resistance under the action of cavitation of sintered pyrophillite samples was investigated. The initial sample of pyrophillite from the Parsovic-BiH deposit was ground a vibrating mill to a granulation of 20 mm, pressed and sintered at temperatures (⁰C): 100; 1100; 1200. To assess cavitation resistance, the change in sample mass as a function of cavitation time was monitored. The cavitation erosion test was performed using the ultrasonic vibratory cavitation test method according to the ASTM G-32 standard. Cavitation velocites were calculated for all samples, as a basic indicator of the resistance of the material under the action of cavitation. The change in the morphology of the surface with the test time was followed by scanning electron microscopy. Based on the values of cavitation velocity and analysis of the surface damage morphology, the cavitation resistance of the tested samples based on pyrophillite was determined. The obtained results indicate that the samples of sintered pyrophillite have satisfactory resistance to the action of cavitation and be applied in conditions of lower cavitation loads.

Comparison of Different Methods for the Evaluation of Cavitation Damaged Surfaces

2005 ◽  
Author(s):  
B. Bachert ◽  
G. Ludwig ◽  
B. Stoffel ◽  
S. Baumgarten
Keyword(s):  
Mass Loss ◽  
White Light ◽  
Cavitation Erosion ◽  
Evaluation Method ◽  
Three Dimensional ◽  
Special Device ◽  
Test Rig ◽  
Rotating Disc ◽  
White Light Interferometer ◽  
Initial Stage

The experimental data which will be presented in this paper are the results of the comparison between different methods for evaluating damaged surfaces by cavitation erosion. The different methods are partly working in the initial stage of cavitation erosion and partly at developed cavitation erosion, where mass loss occurs. The used test rig consists basically of a rotating disc with a diameter of 500 mm on which four holes are located. Each hole generates a cavitation zone while the disc is rotating. The test objects are material specimens made of copper. Copper was used as test material in respect to reasonable durations for the tests. The specimen can be implemented in the casing of the test rig directly across the rotating disc on the diameter where the holes are located. This rotating disc test rig generates a very aggressive type of cavitation, so that mass loss, of course depending on the tested material, will appear after relatively short durations. Also the initial stage of cavitation erosion can be observed. The used test rig is very interesting regarding the possibility to apply different measuring techniques to characterize the erosive aggressiveness of cavitation. These techniques are at first the so-called Pitcount-Method, which allows investigations of cavitation erosion in the initial stage. The second one is an acoustic method, which is based on a structure-borne noise sensor and a specially developed signal processing system. The third method is the measuring of mass loss of the material specimen after several time steps. With the help of a CCD-camera and special digital image processing software, images of different cavitation conditions were recorded. The information obtained from these images should serve as support for the evaluation of the other used methods. After the evaluation with the above mentioned methods, the specimens were evaluated with a special device which works with the help of a white light interferometer. With this evaluation method three-dimensional information can be obtained in respect to the actually eroded volume of the specimens. With this information the lost mass of the specimens could be calculated directly. Especially the comparison of the results obtained from the Pitcount-Method, which is a two-dimensional evaluation method, and the three-dimensional results of the white light interferometer is an important point of the work within this paper.

Applied Cavitation Erosion Testing

2009 ◽  
pp. 56-56-19 ◽  
Author(s):  
JW Tichler ◽  
AWJ de Gee ◽  
HC van Elst
Keyword(s):  
Cavitation Erosion ◽  
Erosion Testing

Multi-Criteria Analysis in Assessment of the Degree of Degradation Pavement Elements Functional Airports Made of Cement Concrete

2017 ◽  
Author(s):  
Mariusz Wesołowski ◽  
Krzysztof Blacha ◽  
Piotr Barszcz
Keyword(s):  
Quality Management System ◽  
Technical Condition ◽  
Cement Concrete ◽  
Functional Elements ◽  
Surface Degradation ◽  
Visual Method ◽  
Flight Operations ◽  
Multi Criteria Analysis ◽  
Degree Of Degradation

An important factor that affects the safety of flight operations is the proper management of airports, which should be based on the obtained in systematic way information about the state of the surface of the functional elements. One of the characteristic quantities of the technical condition of airport indicator is the assessment of the degree of degradation. It should be noted that the degradation is a slow process extended in time and is the lowering of the properties of the structure by external influences, which in turn generates the changes in their structure. Rating degrade surface should be conducted periodically, which period shall be estimated on the basis of information obtained from the process of the operation of aircraft. Demotions surface is determined on the basis of the type and quantity survey found damage and made repairs. The basis for evaluating the degree of surface degradation is to obtain data from surveys conducted using the method of visual and inventory of them. Research by visual method, despite its apparent simplicity, it is difficult to implement. Qualification of damage or repairs to the appropriate group is often not clear, and therefore the inventory process is described in the documentation of quality management system. The multi-criteria analysis is a method of evaluating the weighted supporting estimating the degree of degradation airfield pavements based on data obtained through inspections performed. Its base is included in the determination of a number of criteria for the selection variant, taking into account different weights to each criterion. The value of the indicator characterizing the degree of surface degradation in relation to estimated criteria allows you to schedule the necessary resources needed to carry out repairs and rational planning of repairs.

Research through the Stationary Specimen Method of the X20Cr13 Stainless Steel Used for Hydraulic Pumps

2014 ◽  
Vol 782 ◽  
pp. 251-256 ◽  
Author(s):  
Marian Dumitru Nedeloni ◽  
Nadia Potoceanu ◽  
Danut Florea ◽  
Daniel Chirus
Keyword(s):  
Stainless Steel ◽  
Mass Loss ◽  
Cavitation Erosion ◽  
Martensitic Stainless Steel ◽  
Experimental Tests

This paper presents the cavitation erosion research through the stationary specimen method of the X20Cr13 martensitic stainless steel. Actual research involves a number of 4 different tests for this material and the comparison between these experimental tests is highlighted by the images and graphs forwarded in the paper. All research was done using vibratory apparatus composed from electro-acoustic piezo-converter, acoustic transformer, a titanium sonotrode and the ultrasonic generator DG-2000. The mass loss of the martensitic stainless steel samples was measure with special digital balance.

Analysis of the External Conditions Affecting on the Cavitation Resistance of a Steel

2019 ◽  
Vol 946 ◽  
pp. 31-36
Author(s):  
Hussam L. Alwan ◽  
N. Lezhnin ◽  
Yury Korobov
Keyword(s):  
Surface Resistance ◽  
Cavitation Erosion ◽  
Medium Carbon Steel ◽  
Cavitation Resistance ◽  
Nacl Solution ◽  
Medium Carbon ◽  
Test Conditions ◽  
External Conditions ◽  
Erosion Test ◽  
Testing Liquid

The aim of this study is to analyze the effect of cavitation erosion test conditions on the surface resistance of medium carbon steel. The ultrasonic vibratory specimen system was used to perform the experiments under the laboratory conditions. The vibratory frequency and the displacement amplitude were 20 kHz and 20 μm, respectively. In design of experiments, four various cavitation behaviors have been studied based on four cavitation test conditions corresponding to those behaviors. These conditions can be summarized as follows: (1) the usage of water as a testing liquid; (2) replacement the water with 3.5% NaCl solution; (3) applying a certain voltage to cause a combined electrochemical action working simultaneously with the water; and (4) applying the same voltage by using the 3.5% NaCl solution instead of water. The obtained results showed that the mass loss differs by test modes applied.

Sign in / Sign up

Export Citation Format

Share Document