Estimation of Service Life of Mechanical Engineering Components

2019 ◽  
Vol 799 ◽  
pp. 71-76
Author(s):  
Oskars Linins ◽  
Ernests Jansons ◽  
Armands Leitans ◽  
Irina Boiko ◽  
Janis Lungevics
Keyword(s):  
Service Life ◽  
Service Time ◽  
Surface Texture ◽  
Mechanical Engineering ◽  
Friction Pair ◽  
Theory Of Elasticity ◽  
New Approach ◽  
Material Fatigue ◽  
Texture Parameters ◽  
3D Surface Texture

The paper is aimed to the methodology for estimation of service life of mechanical engineering components in the case of elastic-plastic contact of surfaces. Well-known calculation methods depending on physics, theory of probability, the analysis of friction pair’ shape and fit include a number of parameters that are difficult or even impossible to be technologically controlled in the manufacturing of mechanical engineering components. The new approach for wear rate estimation using surface texture parameters as well as physical-mechanical properties and geometric parameters of components is proposed. The theoretical part of the calculations is based on the 3D surface texture principles, the basics of material fatigue theory, the theory of elasticity and the contact mechanics of surfaces. It is possible to calculate the service time of the machine, but the process of running-in of the components is relatively short (less than 5%), therefore, the service time is mainly determined by a normal operating period, which also was used to evaluate this period. The calculated input parameters are technologically and metrologically available and new method for calculating the service time can be used in the design process of the equipment. The results of approbation of the method for estimation service time of mechanical engineering, which prove the applicability of mentioned method, are offered as well.

scholarly journals A method for the taphonomic assessment of bone tools using 3D surface texture analysis of bone microtopography

2020 ◽  
Vol 12 (10) ◽  
Author(s):  
Naomi L. Martisius ◽  
Shannon P. McPherron ◽  
Ellen Schulz-Kornas ◽  
Marie Soressi ◽  
Teresa E. Steele
Keyword(s):  
Texture Analysis ◽  
Surface Texture ◽  
Bone Tools ◽  
3D Surface ◽  
Texture Parameters ◽  
One Step ◽  
Ancient Bone ◽  
Anthropogenic Modifications ◽  
3D Surface Texture ◽  
Surface Texture Analysis

Abstract Increasingly researchers have employed confocal microscopy and 3D surface texture analysis to assess bone surface modifications in an effort to understand ancient behavior. However, quantitative comparisons between the surfaces of purported archaeological bone tools and experimentally manufactured and used bones are complicated by taphonomic processes affecting ancient bone. Nonetheless, it may be reasonable to assume that bones within the same deposits are altered similarly and thus these alterations are quantifiable. Here we show how unworked bones can be used to quantify the taphonomic effect on bone surfaces and how this effect can then be controlled for and incorporated into an analysis for evaluating the modified surfaces of purported bone tools. To assess the baseline taphonomy of Middle Paleolithic archaeological deposits associated with typologically identified bone artifacts, specifically lissoirs, we directly compare the surface textures of ancient and modern unworked ribs. We then compare the ancient unworked ribs and lissoirs to assess their differences and predict the ancient artifacts’ original surface state using a multilevel multivariate Bayesian model. Our findings demonstrate that three of five tested surface texture parameters (Sa, Spc, and IsT) are useful for distinguishing surface type. Our model predictions show that lissoirs tend to be less rough, have more rounded surface peaks, and exhibit more directionally oriented surfaces. These characteristics are likely due to anthropogenic modifications and would have been more pronounced at deposition. Quantifying taphonomic alterations moves us one step closer to accurately assessing how bone artifacts were made and used in the ancient past.

Establishing proper scanning conditions in atomic force microscopy on polyimide and polyurethane samples and their effect on 3D surface texture parameters

Scanning ◽  
2015 ◽  
Vol 37 (5) ◽  
pp. 335-349 ◽  
Author(s):  
Iuliana Stoica ◽  
Elena Gabriela Hitruc ◽  
Daniel Timpu ◽  
Virgil Barboiu ◽  
Dan Sorin Vasilescu
Keyword(s):  
Atomic Force Microscopy ◽  
Surface Texture ◽  
Force Microscopy ◽  
Atomic Force ◽  
3D Surface ◽  
Texture Parameters ◽  
3D Surface Texture

Texture Classification of 3D Surface Textures via Directional Quincunx Lifting

2014 ◽  
Vol 686 ◽  
pp. 82-85
Author(s):  
You Jiao Li ◽  
Tong Sheng Ju ◽  
Meng Gao
Keyword(s):  
Surface Texture ◽  
Euclidean Distance ◽  
Texture Classification ◽  
Experimental Results ◽  
New Approach ◽  
Surface Textures ◽  
Minimum Euclidean Distance ◽  
3D Surface ◽  
3D Surface Texture

This thesis presents a new approach to classify 3D surface textures by using lifting transform with quincunx subsampling. Feature vectors are generated from eight different lifting prediction directions. We classify 3D surface texture images based on minimum Euclidean distance between the test images and the training sets. The feasibility and effectiveness of our proposed approach can be validated by the experimental results.

A Multifeature Approach to Tool Wear Estimation Using 3D Workpiece Surface Texture Parameters

2010 ◽  
Vol 132 (6) ◽  
Author(s):  
Yi Liao ◽  
David A. Stephenson ◽  
Jun Ni
Keyword(s):  
Tool Wear ◽  
Surface Texture ◽  
Polycrystalline Diamond ◽  
Texture Features ◽  
Surface Measurement ◽  
Warning Sign ◽  
Workpiece Surface ◽  
3D Surface ◽  
Texture Parameters ◽  
3D Surface Texture

This work presents a new way to determine the condition of a cutting tool based on 3D texture parameters of workpiece surface. Recently, a laser holographic interferometer has been developed to rapidly measure a large workpiece surface and generate a 3D surface height map with micron level accuracy. This technique enables online surface measurement for machined workpieces. By measuring and analyzing workpiece surface texture, the interaction between the tool’s cutting edges and the workpiece surface can be extracted as a spatial signature. It can then be used as a warning sign for tool change because the workpiece produced by a heavily worn tool exhibits more irregularities in its surface texture than that produced by a normal tool. Multiple texture parameters such as image intensity histogram distribution parameter, 3D peak-to-valley height, and 3D surface waviness parameter are employed to indicate the onset of severe tool wear. In this work, aluminum (Al308) and compacted graphite iron parts were machined by a polycrystalline diamond insert and a multiphase coated tungsten carbide insert, respectively. After that, multiple 3D surface texture features of workpieces samples under different phases of tool wear were analyzed in order to assess tool wear conditions. The experimental results verify that these surface texture features can be used as good indicators for online tool wear monitoring.

Characterization of Nanofinished WC-Co Coating Using Advanced 3D Surface Texture Parameters

2018 ◽  
Author(s):  
Gourhari Ghosh ◽  
Ajay Sidpara ◽  
P. P. Bandyopadhyay
Keyword(s):  
Surface Texture ◽  
Functional Performance ◽  
Fluid Retention ◽  
Motif Analysis ◽  
Aircraft Landing ◽  
Power Spectral ◽  
Engine Cylinder ◽  
Texture Parameters ◽  
Before And After ◽  
3D Surface Texture

WC-Co coatings are extensively used in abrasion, sliding, and erosion resistance applications for its favourable mechanical properties. Nanofinishing of WC-Co coating is required for aircraft landing gear cylinder and diesel engine cylinder. Characterisation of surface topography becomes an important aspect in tribological applications as it has significant effect on the functional performance of the surfaces. In this present study, the motif analysis with 5% wolf pruning is applied to identify the significant hills for pattern reorganization of the surface texture generated by different finishing steps such as grinding, shape adaptive grinding (SAG) and chemical assisted SAG (CA-SAG). Several 3D advanced texture parameters are employed to characterize the coated surface before and after finishing in terms of surface roughness, third and fourth moments (skewness and kurtosis) of the probability density function, bearing area ratio curve and fluid retention properties of the surface. Furthermore, power spectral density (PSD) analysis is performed to analyse the unevenness and periodicity of the texture. It is observed that the fluid retention property and the bearing property of the surface improve with the subsequent finishing stage.

scholarly journals Influence of Different Surface Texture Parameters on the Contact Performance of Piston Ring-Sleeve Friction Pair of Hydraulic Cylinders

2021 ◽  
Vol 2021 ◽  
pp. 1-12
Author(s):  
Wen’an Wang ◽  
Zhiqi Liu ◽  
Dongliang Chen ◽  
Zhiming Xie ◽  
Jianli Song
Keyword(s):  
Friction Coefficient ◽  
Surface Texture ◽  
Surface Density ◽  
Friction And Wear ◽  
Piston Ring ◽  
Friction Pair ◽  
Wear Characteristics ◽  
Texture Parameters ◽  
Cylinder Piston ◽  
Friction And Wear Characteristics

The surface texture, a major way to decrease friction and wear of the cylinder-piston ring friction pair, was conducted on cylinder-piston ring friction pair specimen using the orthogonal experimental design method to investigate the effect of different texture parameters (size, depth, shape, and surface density) of the friction and wear characteristics. Through simulation analysis, the texture parameters that affect the friction and wear characteristics are obtained. Using the evaluation method of friction coefficient and mass wear rate, the influence sequence and optimal values of texture parameters that affect friction and wear characteristics are obtained through range analysis. The results show that, after surface texture treatment under mixed lubrication conditions, the friction characteristics of the friction pair have changed and the friction coefficient and friction and wear rate have been significantly reduced. The results show that the triangular texture has a good antifriction effect, the texture depth is deepened, and the surface density and the size increases have a positive effect on the improvement of friction and wear. An ultra-depth microscope was used to observe the wear morphology of the friction and wear tests. The results show that the weakening of the third body wear by the texturing treatment and the maintenance of oil lubrication are the main reasons for reducing friction and wear.

3D Surface Roughness Parameters of Nanostructured Coatings with Application in the Aerospace Industry

2015 ◽  
Vol 772 ◽  
pp. 3-7 ◽  
Author(s):  
Guna Civcisa ◽  
Tõnu Leemet
Keyword(s):  
Surface Texture ◽  
Turbine Blades ◽  
Aerospace Industry ◽  
Base Material ◽  
Repeated Measurements ◽  
Gas Turbine Blades ◽  
3D Surface ◽  
Texture Parameters ◽  
3D Surface Roughness ◽  
3D Surface Texture

This paper presents a study of 3D surface texture measurements and analysis of several surface texture parameters. A stylus measuring instrument was used to measure 3D surface topographies. In experimental part of this study, two coated gas turbine blades used in aerospace industry were chosen to examine surface of the coatings in nano-scale. Surface texture parameters of Ti-Al coating and Ti-Al-N coating were measured and compared to each other. The aim of the research is to analyze the surface of these coatings in an areal (3D) manner. The results indicate slight differences between these two surface textures despite the fact that both are Titanium-based coatings, and the surface of base material for both samples was prepared in the same way before deposition. Further study with repeated measurements of surface texture for deposed coatings has to be made after erosion tests.

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