Role of Surface Roughness in the Interlayer Boundary Formation during Manufacturing of Clad Metal Composites

2020 ◽  
Vol 989 ◽  
pp. 654-659
Author(s):  
Denis Rinatovich Salikhyanov
Keyword(s):  
Surface Roughness ◽  
Computer Simulation ◽  
Research Work ◽  
Dissimilar Materials ◽  
Metal Composites ◽  
Boundary Formation ◽  
Actual Contact ◽  
Mathematical And Computer Simulation

In the present research work, the role of surface roughness in the interlayer boundary formation during manufacturing of clad metal composites was analyzed. Process of interlayer boundary formation was described through mathematical and computer simulation. The importance of taking into account not only arithmetical mean roughness Ra or ten-point mean roughness Rz, but also Rz/S ratio (where S – mean spacing of adjacent peaks) is shown, because this relation affects the length of actual contact between dissimilar materials. As the result of mathematical and computer simulation, dependence of the length of actual contact between dissimilar materials on Rz/S ratio and semi-angle of the ridge vertex was obtained.

Effect of Surface Roughness and Lubricant on Scuffing Initiation

2012 ◽  
Author(s):  
Jiman Han ◽  
Qian Zou
Keyword(s):  
Surface Roughness ◽  
Film Thickness ◽  
Contact Area ◽  
Thickness Distribution ◽  
Research Work ◽  
Elastohydrodynamic Lubrication ◽  
Area Ratio ◽  
Contact Area Ratio ◽  
Effect Of Surface

Scuffing failure generally occurs at oil film breakdown and large amount of metal-to-metal interaction between the contacting surfaces, where the role of surface roughness and lubricant becomes prominent. In order to evaluate the effect of surface roughness and lubricant on scuffing, scuffing simulation was carried out using contact mechanics and plasto-elastohydrodynamic lubrication model (MixedPEHL) by taking into account the plastic deformation in the contact area. The evolution of pressure, film thickness, contact area ratio, and subsurface effective plastic strain (EPS) was performed with three types of surface roughness and two different lubricants. Comparisons of pressure distribution, film thickness distribution, film thickness to surface roughness ratio (λ ratio), and contact area ratio were described to investigate the effect of surface roughness and lubricants on scuffing behavior. A better understanding on the effect of surface roughness and lubricant on scuffing processes was obtained through the research work.

The role of surface roughness in the wettability and floatability of quartz particles

2020 ◽  
Vol 527 ◽  
pp. 146799 ◽  
Author(s):  
Zhanglei Zhu ◽  
Wanzhong Yin ◽  
Donghui Wang ◽  
Haoran Sun ◽  
Keqiang Chen ◽  
...  
Keyword(s):  
Surface Roughness

A study of factors which influence the job satisfaction of stockpeople on commercial pig farms

1990 ◽  
Vol 1990 ◽  
pp. 95-95
Author(s):  
R C Segundo ◽  
P R English ◽  
G Burgess ◽  
S A Edwards ◽  
O MacPherson ◽  
...  
Keyword(s):  
Job Satisfaction ◽  
Reproductive Performance ◽  
Research Work ◽  
Farm Animals ◽  
Considerable Influence ◽  
Pig Farms ◽  
And Performance ◽  
The Uk ◽  
Farm Livestock

The role of stockmanship in relation to the wellbeing of farm animals has been emphasised in the UK Codes of Recommendations for the Welfare of Farm Livestock (MAFF, 1983). Moreover, previous research work has demonstrated important effects of good and bad stockmanship not only on welfare but also on growth, lactational and reproductive performance of pigs and other farm livestock (Hemsworth et al, 1987). There is a need, therefore, to establish the factors which motivate and demotivate stockpeople since the degree of job satisfaction is likely to have a considerable influence on the attitude and performance of stockpeople and on their empathy with the animals in their care. With this objective in mind, a questionnaire was designed to investigate the aspects which could have an influence on the job satisfaction of the stockpeople involved in pig production.

Role of Rubber Stiffness and Surface Roughness in the Tribological Performance on Ice

2017 ◽  
Vol 61 (2) ◽  
pp. 295-303 ◽  
Author(s):  
Nihat A. Isitman ◽  
András Kriston ◽  
Tibor Fülöp
Keyword(s):  
Surface Roughness ◽  
Tribological Performance

Interfacial Slip Violations in Polymer Solutions:  Role of Microscale Surface Roughness

Langmuir ◽  
2003 ◽  
Vol 19 (8) ◽  
pp. 3304-3312 ◽  
Author(s):  
Javier Sanchez-Reyes ◽  
Lynden A. Archer
Keyword(s):  
Surface Roughness ◽  
Polymer Solutions ◽  
Interfacial Slip

Theories of Nation Building: An Analysis for Academicians and Nation Builders to Employ Nepali Army

Unity Journal ◽  
2021 ◽  
Vol 2 ◽  
pp. 1-17
Author(s):  
Anand Sing Bhat
Keyword(s):  
Social Integration ◽  
Social Transformation ◽  
Theoretical Perspective ◽  
Research Work ◽  
Nation Building ◽  
Armed Forces ◽  
Policy Makers ◽  
Library Research ◽  
Historical Times

Some of the theories of nation building have been dedicated to the study of link between nation and nationalism; others are attributed to explore nation building, state building, social integration, national integration and even conflict transformation during various historical periods. However, nation building is a normative concept used by academicians and nation builders alike to study the role of armed forces in nation building in recent times. Although research has conducted on ethnicity and nation building in Nepal, a little is known about application of theoretical perspective to explore the role of Nepali Army in nation building. Apparently, this article argues that the level of theoretical awareness of academicians and nation builders needs improvement and multiple theories of nation building are relevant to explore the role of Nepali Army in nation building during various enclaves of Nepali nation. Important issues like what are the relevant theories in Nepali context to analyse nation building? Their implication during the historical times to study the link of Nepali Army with nation building needs to be studied. Hence, this paper comparatively examines a nation building theories and their relevant implications during various enclaves of Nepali nation particularly applauding the role on Nepali Army. Conceptual framework based on Saunder's Research Onion Peeled (2007) method was used with qualitative design in a way of inductive approach to conduct the research work to investigate the research questions. Comparative document study, library research, quick survey with policy makers, government employees, professors, university students APF Officers and Army Officers based on purposive sampling method have been used. Study found that Nepali nation passes through its own way of building the nation in various enclaves, none of the theories are complete to study the employment of Nepali Army to produce visible and encouraging results. The level of theoretical awareness of academicians and nation builders needs further improvement. For this, multiple theories particularly related to social transformation, infrastructural development in support of centre to periphery relation; social integration and nationalism are appropriate.

Microstructural Size Dependency in Nonlinear Lateral Stability of Random Reinforced Microshells via Meshfree-Based Applied Mathematical Modeling

2021 ◽  
pp. 2150164
Author(s):  
Jie-Hua Sun ◽  
Zhi-Dong Zhou ◽  
Saeid Sahmani ◽  
Babak Safaei
Keyword(s):  
Research Work ◽  
Meshfree Method ◽  
Resin Matrix ◽  
Small Scale ◽  
Lateral Stability ◽  
Computational Framework ◽  
Probabilistic Technique ◽  
Prime Objective ◽  
Shear Deformable

The prime objective of this research work is to develop an efficient small scale-dependent computational framework incorporating microstructural tensors of dilatation gradient, rotation gradient, and deviatoric stretch gradient to analyze nonlinear lateral stability of cylindrical microshells. The numerical strategy is established based upon a mixed formation of the third-order shear deformable shell model and modified strain gradient continuum mechanics. The graphene nanoplatelet reinforcements are assumed to be randomly dispersed in a checkerboard scheme within the resin matrix. Accordingly, to extract the effective material properties, the Monte Carlo simulation together with a probabilistic technique are employed. The numerical solution for the microstructural-dependent nonlinear problem is carried out via the moving Kriging meshfree method having the capability to accommodate accurately the essential boundary conditions using proper moving Kriging shape function. It is represented that the role of the stiffening characters related to the effect of microstructural dilatation gradient, rotation gradient, and deviatoric stretch reduces continuously by going to deeper territory of the load-deflection stability path. Moreover, it is indicated that among various microstructural gradient tensors, the stiffening character of the rotation gradient is higher than deviatoric stretch gradient, and the stiffening character of the latter is more considerable than the dilatation gradient tensor.

Evaluation of Surface Integrity in Electrochemical Micromachining of A286 Super alloy

2021 ◽  
Author(s):  
Rajkeerthi E ◽  
Hariharan P
Keyword(s):  
Surface Roughness ◽  
Surface Quality ◽  
Surface Integrity ◽  
Research Work ◽  
Machining Process ◽  
Electrochemical Micromachining ◽  
Dissolution Mechanism ◽  
Machined Surface ◽  
Micro Holes ◽  
Super Alloy

Abstract Surface integrity of micro components is a major concern particularly in manufacturing industries as most geometry of the products must meet out necessary surface quality requirements. Advanced machining process like electrochemical micro machining possess the capabilities to machine micro parts with best surface properties exempting them from secondary operations. In this research work, different electrolytes have been employed for producing micro holes in A286 super alloy material to achieve the best surface quality and the measurement of surface roughness and surface integrity to evaluate the machined surface is carried out. The machined micro hole provides detailed information on the geometrical features. A study of parametric analysis meant for controlling surface roughness and improvement of surface integrity has been made to find out the suitable parameters for machining. The suitability of various electrolytes with their dissolution mechanism and the influence of various electrolytes have been thoroughly studied. Among the utilized electrolytes, EG + NaNO3 electrolyte provided the best results in terms of overcut and average surface roughness.

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