scholarly journals Literature Review on Fretting Wear and Contact Mechanics of Tribological Coatings

Coatings ◽  
2019 ◽  
Vol 9 (8) ◽  
pp. 501 ◽  
Author(s):  
Lifeng Ma ◽  
Kilho Eom ◽  
Jean Geringer ◽  
Tea-Sung Jun ◽  
Kyungmok Kim
Keyword(s):  
Literature Review ◽  
Contact Mechanics ◽  
Relative Displacement ◽  
Fretting Wear ◽  
Tribological Coatings ◽  
Review Study ◽  
Stress States ◽  
Wear Damage ◽  
Industrial Solutions ◽  
Fretting Damage

This article reviews fretting wear damage in industries and in the contact mechanics of coated systems. Micro-slip motion resulting in fretting damage is discussed along with major experimental factors. The experimental factors, including normal force, relative displacement, frequency and medium influence are directly compared. Industrial solutions to reduce fretting damages are then discussed. The contact mechanics of a coated system are reviewed to quantify stress states in a coating layer and the substrate. Finally, a literature review on simulation for fretting is carried out. This review study provides useful methods and practical solutions to minimize fretting wear damage.

scholarly journals Effects of Dispersant and ZDDP Additives on Fretting Wear

2020 ◽  
Vol 69 (1) ◽  
Author(s):  
A. Kontou ◽  
R. I. Taylor ◽  
H. A. Spikes
Keyword(s):  
Bearing Steel ◽  
Fretting Wear ◽  
Significant Protection ◽  
Surface Characterisation ◽  
Stroke Length ◽  
Base Oil ◽  
Wear And Friction ◽  
Dry Conditions ◽  
Wear Damage ◽  
Fretting Damage

AbstractThis paper examines the effect of dispersant and anti-wear additives on fretting wear in lubricated bearing steel contacts. Reciprocating sliding ball-on-flat fretting tests with a stroke length of 50 μm have been carried out on steel-to-steel contacts in both dry and lubricated conditions. Wear and friction coefficient have been measured, and surface characterisation has been carried out using optical techniques to investigate fretting wear. The presence of base oil reduces fretting wear markedly compared to dry conditions, but fretting damage is still observed at low reciprocation frequencies. As frequency is increased, there is a transition from oxidative to adhesive/scuffing damage. The anti-wear additive ZDDP is effective in forming a tribofilm on the surfaces and reducing visible oxidation and wear. A succinimide dispersant also reduces the accumulation of solid debris but does not alleviate wear damage. The combination of both ZDDP anti-wear additive and dispersant in base oil appears to provide significant protection against fretting wear.

scholarly journals Dynamic Analysis of a Bladed Disk With Friction and Fretting-Wear in Blade Attachments

2009 ◽  
Author(s):  
Loi¨c Salles ◽  
Laurent Blanc ◽  
Fabrice Thouverez ◽  
Aleksander M. Gouskov ◽  
Pierrick Jean
Keyword(s):  
Jacobian Matrix ◽  
Relative Displacement ◽  
Correction Method ◽  
Fretting Wear ◽  
Wear Depth ◽  
Industrial Plants ◽  
Friction Dampers ◽  
Coulomb’S Friction ◽  
Bladed Disk ◽  
Wear Damage

Assembled bladed disks have many contact interfaces (blade-disk joint, blade shrouds, friction dampers...). Because of relative displacements at these interfaces, fretting-wear occurs, which affects negatively the lifetime of the structure. Methods exist to predict fretting-wear in quasi-static analysis. However they don’t predict all the phenomena observed in blade attachments on real industrial plants. This paper studies the assumption of a responsibility of dynamics for fretting-wear damage. A numerical treatment of fretting-wear under vibratory loading is proposed. The method is based on the Dynamical Lagrangian Frequency Time method. It models unilateral contact through Coulomb’s friction law. The basic idea is to separate time in two scales, slow scale for tribological phenomena and fast scale for dynamics. For a chosen number of periods of vibration, a steady state is assumed and the variables are decomposed in Fourier series. An Alternating Frequency Time procedure is performed to calculate the non-linear forces. Then, a Hybrid Powell’s algorithm is used as solver. A quasi-analytical expression of the Jacobian matrix decreases the duration of calculations. This expression is also used to predict new relative displacement at the interfaces due to the increase of wear depth. This method is similar to a prediction-correction method, with wear depth as the term of continuation. Numerical investigations on a bladed-disk with friction contact interfaces illustrate the performances of this method and show the coupling between dynamical and tribological phenomena.

Study on the Influence of Pitch Diameter Ratio on Contact Mechanics Parameters between the ACSR Strand

2012 ◽  
Vol 246-247 ◽  
pp. 113-117
Author(s):  
Hong Liang Wu ◽  
Hui Ding ◽  
Cheng Li Zhu ◽  
Hong Dou
Keyword(s):  
Contact Mechanics ◽  
Contact Spot ◽  
Diameter Ratio ◽  
Fretting Wear ◽  
Von Mises Stress ◽  
Parameter Distribution ◽  
Fem Method ◽  
Distribution Laws ◽  
Von Mises ◽  
Fretting Damage

Fretting damage generates under the breeze vibration condition. Fretting wear under various pitch diameter ratio at the ACSR strand interface has been studied by FEM method with the LGJ-25/4 ACSR taken as an example. The contact mechanics parameter distribution laws at the strand interface have been obtained. It shows that the peak of von Mises stress, contact pressure, contact state and shear stress at the contact spot decrease as the pitch diameter ratio increases. And the width of yield area also decreases as the pitch diameter ratio increases.

Assessment of Fretting‐Wear Damage in Nuclear and Process Equipment

2021 ◽  
pp. 373-395
Author(s):  
Michel J. Pettigrew ◽  
Metin Yetisir ◽  
Nigel J. Fisher ◽  
Bruce A. W. Smith ◽  
Victor P. Janzen
Keyword(s):  
Fretting Wear ◽  
Process Equipment ◽  
Wear Damage

scholarly journals Surgical treatment of Eagle’s Syndrome through intraoral access: a case report and literature review

2021 ◽  
Vol 1 (1) ◽  
pp. 15-21
Author(s):  
Rodrigo Cristhian Avelino Bezerra ◽  
Jonas Nogueira Ferreira Maciel Gusmão ◽  
Bruno Frota Amora Silva ◽  
Rodrigo Lemos Alves ◽  
Eliardo Silveira Santos ◽  
...  
Keyword(s):  
Case Report ◽  
Surgical Treatment ◽  
Literature Review ◽  
Facial Pain ◽  
Clinical Case ◽  
Styloid Process ◽  
Eagle’S Syndrome ◽  
Intraoral Approach ◽  
Eagle Syndrome ◽  
Review Study

The styloid process is a bone projection that originates in the tympanic portion of the temporal bone. The enlongation of the styloid process, or the ossification of the styloid process, can originate a series of symptoms such as dysphagia, odynophagia, facial pain, otalgia, headache, tinnitus and trismus, establishing the clinical picture of Eagle Syndrome. In this report, we present an important clinical case of adult patient diagnosed with Eagle’s Syndrome who underwent surgery for reduction of the enlongated styloid process, by intraoral approach, added to a literature review study.

scholarly journals AL-QUR’ĀN MESSAGE ABOUT ETHOS OF WORK IN THE PANDEMIC TIME COVID-19

2021 ◽  
Vol 6 (1) ◽  
pp. 59-80
Author(s):  
Eka Damayanti ◽  
Firdaus ◽  
Abdul Ghany ◽  
Ekawati Hamzah
Keyword(s):  
Content Analysis ◽  
Literature Review ◽  
Work Ethic ◽  
The World ◽  
Review Study ◽  
Holy Book

Al-Qur’ān is the holy book as a guide for people in any condition. This including the COVID-19 pandemic that has spread across the world. This article aims to outline the message in the Qur'ān about work ethic during the Covid-19 pandemic. This article is a literature review study with the Maudhui method of the Qur'ān verses related to work ethic. It was using content analysis. The study showed that even though the pandemic is taking place, Muslims are still obliged to work because Allah expressly commands them to work. God's commandment is that humans carry out work according to their ability and earnestly for life in the world and a provision in the hereafter because work is an act of jihad fisabillah.

scholarly journals EMPLOYEE PERFORMANCE MODELS: COMPETENCE, COMPENSATION AND MOTIVATION (HUMAN RESOURCES LITERATURE REVIEW STUDY)

2020 ◽  
Vol 2 (1) ◽  
pp. 185-198
Author(s):  
Muhammad Reza Putra ◽  
Gupron Gupron
Keyword(s):  
Literature Review ◽  
Human Resources ◽  
Employee Performance ◽  
Performance Models ◽  
Competence Motivation ◽  
Review Study ◽  
A Company

In a company, employees are one of the most important elements in achieving company goals. The performance of an employee is certainly influenced by several factors that a manager needs to know. Managers must know the strengths and weaknesses of each manager in order to maximize potential and minimize employee shortages. The factors that influence an employee's performance are motivation, compensation and competence. Motivation is needed by an individual because basically humans need encouragement or inducement in order to work better. Motivation is given as a way to improve employee performance to carry out their responsibilities. The different competencies of each employee are also a factor in the good and bad performance of an employee. The competence of each employee must be improved in order to achieve company goals. Compensation also affects an employee's performance. Compensation can be in the form of money or other facilities. Compensation is given as remuneration by the company to employees who have carried out their duties and responsibilities.

scholarly journals On Deploying Blockchain Technologies in Supply Chain Strategies and the COVID-19 Pandemic: A Systematic Literature Review and Research Outlook

2021 ◽  
Vol 13 (19) ◽  
pp. 10566
Author(s):  
Mohammad Nabipour ◽  
M. Ali Ülkü
Keyword(s):  
Supply Chain ◽  
Literature Review ◽  
Systematic Literature Review ◽  
Web Of Science ◽  
Environmental Issues ◽  
Future Studies ◽  
Blockchain Technology ◽  
Industrial Sectors ◽  
Holistic Review ◽  
Review Study

The emergence of a new pandemic, known as COVID-19, has touched various sections of the supply chain (SC). Since then, numerous studies have been conducted on the issue, but the need for a holistic review study that highlights the gaps and limits of previous research, as well as opportunities and agendas for future studies, is palpable. Through a systematic literature review on blockchain technology (BCT) deployment in supply-chain management (SCM) concerning the COVID-19 pandemic, this research seeks to add to the content of previous studies and to enlighten the path for future studies. Relevant papers were found using a variety of resources (Scopus, Google Scholar, Web of Science, and ProQuest). Seventy-two articles were systematically selected, considering the PRISMA procedure, and were thoroughly analyzed based on BCT, methodologies, industrial sectors, geographical, and sustainability context. According to our findings, there is a significant lack of empirical and quantitative methodologies in the literature. The majority of studies did not take specific industries into account. Furthermore, the articles focusing on the sustainability context are few, particularly regarding social and environmental issues. In addition, most of the reviewed papers did not consider the geographical context. The results indicate that the deployment of BCT in several sectors is not uniform, and this utilization is reliant on their services during the COVID-19 pandemic. Furthermore, the concentration of research on the impacts of the BCT on SCM differs according to the conditions of various countries in terms of the consequences of the COVID-19 pandemic. The findings also show that there is a direct relationship between the deployment of BCT and sustainability factors, such as economic and waste issues, under the circumstances surrounding COVID-19. Finally, this study offers research opportunities and agendas to help academics and other stakeholders to gain a better knowledge of the present literature, recognize aspects that necessitate more exploration, and drive prospective studies.

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