scholarly journals STUDYING OF THE SOURCES OF THE DESTRUCTION OF TURBINE GENERATOR BEARING MADE OF THE BABBIT OF GRADE B83

2019 ◽  
pp. 108-113
Author(s):  
O. V. Balina ◽  
V. V. Nassonov ◽  
V. I. Plehanov
Keyword(s):  
Mechanical Properties ◽  
Fatigue Damage ◽  
Microstructural Analysis ◽  
Electric Load ◽  
Turbine Generator ◽  
Friction Bearing ◽  
Modern Technologies

The article is devoted to the diagnostics of friction bearing of turbine generator and determination of the reasons of its destruction during exploitation. We have studied chemistry and mechanical properties of metal, have calculated strains acting on the shaft of turbine generator in the case of asymmetrical electric load. In the article we present the results of macrostructural and microstructural analysis with usage of modern technologies. According to the data diagnosis obtained, we conclude that the source of bearing destruction is babbit fatigue damage caused by asymmetrical electric load of generator. We recommend controlling the rate of bearing wear by monitoring of babbit components presence in oil and asymmetry of electric load to prevent similar destructions.

Study of wear mechanism of contact surfaces of steam turbine blades made of titanium VT6 alloy

2021 ◽  
pp. 81-89
Author(s):  
A.M. Zolotov ◽  
M.O. Smirnov ◽  
T.A. Chizhik
Keyword(s):  
Mechanical Properties ◽  
Steam Turbine ◽  
Wear Mechanism ◽  
Turbine Blades ◽  
Microstructural Analysis ◽  
X Ray ◽  
Different Types ◽  
Steam Turbine Blades ◽  
Contact Surfaces

The contact surfaces of the banding shelves of adjacent steam turbine blades made of titanium VT6 alloy after operation are studied by fractography, micro-X-ray and microstructural analysis and determination of mechanical properties. The different types of destruction of the contact surfaces are analyzed and explained. It is shown that the reason for intensive abrasion of the turbine blades' binding meshes is violation of the welding mode in the station conditions.

Évaluation de la résistance à la fatigue des enrobés bitumineux fondée sur l'évolution de l'endommagement du matériau en cours d'essai : aspects fondamentaux et application à l'enrobé à matrice de pierre

2003 ◽  
Vol 30 (5) ◽  
pp. 902-913 ◽  
Author(s):  
Daniel Perraton ◽  
Hassan Baaj ◽  
Hervé Di Benedetto ◽  
Michel Paradis
Keyword(s):  
United States ◽  
Mechanical Properties ◽  
Standardized Tests ◽  
Fatigue Damage ◽  
The United States ◽  
New Approach ◽  
Stone Matrix Asphalt ◽  
Damage Rate ◽  
Stone Matrix

Fatigue of bituminous asphalts is one of the main types of pavement destruction. This phenomenon was studied extensively in Europe (RILEM) and in the United States (SHRP). There are no standardized tests in Quebec to assess asphalt fatigue resistance. In France, a new approach based on the determination of damage rates due to fatigue has been developed for a tension–compression test on asphalt core samples to study their fatigue strength. This paper presents a summary of the knowledge on asphalt fatigue. Damage rate analyses, developed by the DGCB (Département de Génie Civil et du Bâtiment) of the ENTPE at Lyon, is detailed and applied to stone matrix asphalt (SMA). Results show the validity of the approach by damage and the good fatigue damage strength of the SMA.Key words: bituminous asphalts, fatigue, complex module, damage, stone matrix asphalts (SMA), viscoelasticity, mechanical properties of bituminous asphalts.[Journal Translation]

Development of the Algorithm for Determination of Mechanical Properties of Steel 20 with Different Levels of Cumulative Fatigue Damage with the Application of Compact Samples

2018 ◽  
Vol 284 ◽  
pp. 581-586 ◽  
Author(s):  
R.N. Hasanov ◽  
A.S. Valiev ◽  
I.R. Kuzeev
Keyword(s):  
Mechanical Properties ◽  
Fatigue Damage ◽  
Bending Test ◽  
Large Samples ◽  
Study Results ◽  
Impact Bending ◽  
Cumulative Fatigue Damage ◽  
Steel 20 ◽  
Different Levels

Nowadays, a change of material properties is evaluated on the basis of the results of "traditional" methods (for example, tensile testing and impact bending test). Unfortunately, "traditional" mechanical testing requires quite large samples, that leads to a damage of studied objects integrity. That is why testing with the application of compact samples, which allows converting obtained results into regular parameters, such as tensile properties and fracture resistance, was developed. Due to the novelty of this method, influence of different factors on testing results is understudied. Here arises the aim to study the influence of the level of accumulated damage on testing results. Regular changes of small punch testing tensile diagrams, depending on the number of worked out cycles, are under study in the present paper. Based on the study results, algorithm for determination of mechanical properties of steel 20 with different levels of cumulative fatigue damage with the application of compact samples was developed.

An analysis of the transport properties and mechanical stability of rapidly solidified Al-Sb alloy

2015 ◽  
Vol 10 (2) ◽  
pp. 2663-2681
Author(s):  
Rizk El- Sayed ◽  
Mustafa Kamal ◽  
Abu-Bakr El-Bediwi ◽  
Qutaiba Rasheed Solaiman
Keyword(s):  
Mechanical Properties ◽  
Thermal Conductivity ◽  
Melt Spinning ◽  
Elastic Moduli ◽  
Mechanical Stability ◽  
Microstructural Analysis ◽  
Alloy System ◽  
Antimony Content ◽  
The Stability ◽  
Rapidly Solidified

The structure of a series of AlSb alloys prepared by melt spinning have been studied in the as melt–spun ribbons  as a function of antimony content .The stability  of these structures has  been  related to that of the transport and mechanical properties of the alloy ribbons. Microstructural analysis was performed and it was found that only Al and AlSb phases formed for different composition.  The electrical, thermal and the stability of the mechanical properties are related indirectly through the influence of the antimony content. The results are interpreted in terms of the phase change occurring to alloy system. Electrical resistivity, thermal conductivity, elastic moduli and the values of microhardness are found to be more sensitive than the internal friction to the phase changes. 

Basic set of experiments for determination of mechanical properties of sand

2014 ◽  
Vol 62 (1) ◽  
pp. 129-137
Author(s):  
A. Sawicki ◽  
J. Mierczyński
Keyword(s):  
Mechanical Properties ◽  
Soil Mechanics ◽  
Physical And Mechanical Properties ◽  
Local Strain ◽  
Initial State ◽  
Laboratory Equipment ◽  
Additional Information ◽  
Basic Set ◽  
Initial Anisotropy

Abstract A basic set of experiments for the determination of mechanical properties of sands is described. This includes the determination of basic physical and mechanical properties, as conventionally applied in soil mechanics, as well as some additional experiments, which provide further information on mechanical properties of granular soils. These additional experiments allow for determination of steady state and instability lines, stress-strain relations for isotropic loading and pure shearing, and simple cyclic shearing tests. Unconventional oedometric experiments are also presented. Necessary laboratory equipment is described, which includes a triaxial apparatus equipped with local strain gauges, an oedometer capable of measuring lateral stresses and a simple cyclic shearing apparatus. The above experiments provide additional information on soil’s properties, which is useful in studying the following phenomena: pre-failure deformations of sand including cyclic loading compaction, pore-pressure generation and liquefaction, both static and caused by cyclic loadings, the effect of sand initial anisotropy and various instabilities. An important feature of the experiments described is that they make it possible to determine the initial state of sand, defined as either contractive or dilative. Experimental results for the “Gdynia” model sand are shown.

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