INVESTIGATION OF CHANGES IN THE MODULUS OF ELASTICITY OF THE SURFACE LAYER MATERIAL DURING FRETTING WEAR

Tribologia ◽  
2020 ◽  
Vol 289 (1) ◽  
pp. 13-19
Author(s):  
Vyacheslav F. BEZJAZYCHNYI ◽  
Marian SZCZEREK ◽  
Roman V. LYUBIMOV
Keyword(s):  
Surface Layer ◽  
Modulus Of Elasticity ◽  
Fretting Wear ◽  
Material Surface ◽  
Research Results ◽  
Layer Material

The method, the equipment used, and the results of the study are described in relation to the regularity of changes in the modulus of elasticity of the part material surface layer during operation when the part is under conditions of fretting wear of the contacting surfaces. Recommendations for the practical use of the research results are given.

Prediction and assessment of effective state of machinery surface layer at science intensive technologies use

2018 ◽  
Vol 2018 (8) ◽  
pp. 44-48
Author(s):  
В. Бутенко ◽  
V. Butenko
Keyword(s):  
Surface Layer ◽  
Quality Index ◽  
Working Capacity ◽  
Material Quality ◽  
Layer Material ◽  
Operation Characteristics

The assessment indices of surface layer effective state in machinery subjected to different ways of finishing are considered. The role of the dislocation restructurization process in the formation of operation characteristics of surface layer material quality and prediction of its working capacity is shown. A generalized quality index of multi-component functional layers formed on operation surfaces of machinery is described.

High Strength Autoclaved Mortars

1984 ◽  
Vol 42 ◽  
Author(s):  
R. Baggott ◽  
A. Sarandily
Keyword(s):  
Surface Energy ◽  
Modulus Of Elasticity ◽  
Preparation Method ◽  
High Strength ◽  
Dominant Factor ◽  
Material Surface ◽  
Specific Material

AbstractAutoclaved cement-silica mortars having flexural strengths of up to 57 MPa were prepared by pressing and casting methods of fabrication. It was found that the Griffith dependence of strength upon the size of the largest flaw, the modulus of elasticity and the surface energy was applicable. The relative contributions of these three parameters were evaluated and it was established that although the maximum flaw was the dominant factor in a specific material, surface energy changes were responsible for major strength differences associated with water-solid ratios or variations in the preparation method. Preliminary studies identified the various microstructural features that operated as Griffith's flaws.

Finishing and Hardening of a Flat Surface Ring Area of a Workpiece by Rotary Burnishing

2017 ◽  
Vol 743 ◽  
pp. 245-247
Author(s):  
Victor P. Kuznetsov ◽  
Vladimir V. Voropaev ◽  
Andrei S. Skorobogatov
Keyword(s):  
Surface Layer ◽  
Feed Rate ◽  
Steel Surface ◽  
Flat Surface ◽  
Elementary Volume ◽  
Aisi 304 ◽  
Layer Material ◽  
Hardening Process ◽  
Aisi 304 Steel ◽  
Smoothing Process

This work researches a smoothing process of original micro-profile and hardening process of AISI 304 steel surface layer material while performing rotary burnishing of the flat surface ring area. The paper establishes the interrelation between the number of indenter impacts and elementary volume of the material with a roughness and microhardness of the surface layer. The minimum roughness Ra=30 … 45 nanometers and the maximum microhardness of 425 … 475 HV0.25 is reached with the feed rate of 0.05 mm/rev and impact multiplicity of 70 … 100.

The Analysis of Finishing Tooling Influence on Contact Fatigue Researched by Profilometer

2013 ◽  
Vol 199 ◽  
pp. 117-122
Author(s):  
Wojciech Labuda ◽  
Adam Charchalis
Keyword(s):  
Surface Roughness ◽  
Surface Layer ◽  
Contact Fatigue ◽  
Roughness Coefficient ◽  
304L Stainless Steel ◽  
Technological Parameters ◽  
Research Results ◽  
Burnishing Process ◽  
Relative Hardness ◽  
Surface Layer Quality

The article presents the research results referring to the analysis of the influence of finish treatment ( lathing, grinding, burnishing) on the contact fatigue of steel applied to marine pump shafts. The research was performed on a roller 40 mm in diameter made of 304L stainless steel. Within the research, the optimalization of burnishing technological parameters was conducted on account of the minimalization of Ra surface roughness coefficient as well as the maximalization of SU degree of surface layer relative hardness [. The multi criteria optimalization conducted by min-max method [ with regard to minimum surface roughness as well as maximum degree of surface layer hardness demonstrated that burnishing process should be carried out at the following technological parameters: burnishing force 1.1 kN, burnishing speed 35 m/min, feed 0.13 mm/rev. In addition, the influence of the burnisher passes number on the surface layer quality was determined [.The paper will present the research results of contact fatigue examination of samples after finish machining.

Electrochemical Properties of Ni-Cr and Co-Cr Alloys Used in Prosthodontics

2011 ◽  
Vol 183 ◽  
pp. 143-148 ◽  
Author(s):  
M. Pochrząst ◽  
Jan Marciniak ◽  
K. Wróbel ◽  
Bohdan Bączkowski
Keyword(s):  
Surface Layer ◽  
Electrochemical Properties ◽  
Electrochemical Impedance ◽  
Artificial Saliva ◽  
Electric Circuit ◽  
Material Surface ◽  
Electrochemical Tests ◽  
Solution Interface ◽  
Pitting Corrosion Resistance ◽  
Selection Of

The aim of the work was evaluation of electrochemical properties of Co-based alloys (Remanium GM 800+ and Biosil F) and Ni-based alloys (Heraenium NA and Remanium G-Soft) commonly used on frameworks for porcelain faced cast partial dentures. First stage of the work was evaluation of surface roughness by means of direct linear contact measurement (SURTRONIC 3+ profiler, Taylor/Hobson) of samples after casting and surface treatment. Electrochemical properties of surface were assessed by means of potentiodynamic and impedance methods. In potentiodynamic tests, in order to evaluate pitting corrosion resistance of the analyzed alloys, anodic polarization curves were recorded. The VoltaLab® PGP 201 system was applied in corrosion tests. Moreover, in order to evaluate structure and properties of the surface layer the electrochemical impedance spectroscopy (EIS) was applied. Selection of this method enabled to determine the impedance of the material – surface layer – solution interface with the use of approximation of impedance data by means of equivalent electric circuit model. The EIS tests were carried out with the use of the AutoLab PGSTAT 302N system equipped with the FRA2 Faraday impedance module. Electrochemical tests were carried out in artificial saliva at the temperature of 37°C and pH = 7,0±0,1.

The Impact of Road Construction Materials Dynamic Modulus Parameters on Road Surface Shearing Stress

2012 ◽  
Vol 178-181 ◽  
pp. 1183-1187
Author(s):  
Er Yong Chuo ◽  
De Qun Wang ◽  
Guo Rui Deng
Keyword(s):  
Surface Layer ◽  
Asphalt Pavement ◽  
Damping Ratio ◽  
Construction Materials ◽  
Road Surface ◽  
Shearing Stress ◽  
Wave Load ◽  
Layer Material ◽  
Driving Speed ◽  
The Impact

At the beginning,we used the ABAQUS to establish a two-dimensional finite element model of typical asphalt pavement, and analysised the changing axiom of road surface shearing stress under the half sine wave load. Also, we studied on the impact of damping ratio and the driving speed on shearing stress. Finally, by using SPSS13.0 software to compare the impact of speed, the surface layer material damping ratio, lower modulus ratio, the thickness of the surface layer and the thickness of the subbase. The results show that, to reduce the cracking damage caused by oversized shearing stress in asphalt pavement, we should first consider the damping ratio of surface layer material, and the most effective method is to use the road-building material of high damping ratio to prevent cracks, at the same time we should raise the driving speed.

scholarly journals Features of Creation of Surface Layer Mechanical Condition Parameters in Orthogonal Cutting

2019 ◽  
Vol 297 ◽  
pp. 05006
Author(s):  
Valeriy Blumenstein ◽  
Konstantin Petrenko
Keyword(s):  
Surface Layer ◽  
Metal Cutting ◽  
Orthogonal Cutting ◽  
Surface Plastic Deformation ◽  
Analytical Models ◽  
Surface Plastic ◽  
Strain Rate Tensor ◽  
Flow Lines ◽  
Mechanical Condition ◽  
Research Results

In this article, the technique and research results on creation of surface layer mechanical conditions parameters at orthogonal cutting are presented. Stress tensor, strain rate tensor and general mechanical condition factors distribution along flow lines were obtained. Distributions of stresses, strain rates, mean normal stress and stress state index along flow lines consist of three steps of quasi-monotonous deformation. On every step there is a monotonous increasing or decreasing of these parameters. It is demonstrated that creation of surface layer mechanical condition parameters in metal cutting and surface plastic deformation methods follow common patterns. Experimental research results confirmed the validity of proposed analytical models for stressing programs in orthogonal metal cutting.

Theoretical analysis of the effect of the surface layer material hardening on the corrosion resistance of the surface during operation

2021 ◽  
pp. 351-355
Author(s):  
V.F. Bez’yazychny ◽  
V.V. Pleshkun ◽  
O.N. Fedonin
Keyword(s):  
Corrosion Resistance ◽  
Surface Layer ◽  
Theoretical Analysis ◽  
Quality Parameters ◽  
Processing Conditions ◽  
Material Quality ◽  
Layer Material ◽  
Technological Processing

The analysis of the influence of technological processing conditions and material quality parameters of the surface layer of the part, including material hardening indicators, on the corrosion resistance characteristics of the part material is presented. The corresponding calculated dependences are given.

Sign in / Sign up

Export Citation Format

Share Document