Influence of contact form on mechanical wear characteristics of single diamond scratching on Ta12W

2020 ◽  
Vol 72 (10) ◽  
pp. 1311-1316 ◽  
Author(s):  
Haiyong Wu ◽  
Hui Huang
Keyword(s):  
Significant Influence ◽  
Contact Area ◽  
Point Contact ◽  
Wear Volume ◽  
Contact Form ◽  
Mechanical Wear ◽  
Content Type ◽  
Wear Characteristics ◽  
Single Crystal Diamond ◽  
Point Line

Purpose Mechanical wear is the main wear form of abrasive single crystal diamond (SCD) grit. The mechanical wear of SCD grit has a significant influence on the tool life and machining quality. This paper aims to investigate the influence of grit–workpiece contact form on the mechanical wear characteristics of SCD grit. Design/methodology/approach Three different grit–workpiece contact forms, which involved point/line/face contact forms, are investigated to reveal the wear mechanism of SCD grit scratching on Ta12W. The wear morphology, wear volume and scratching forces are measured, and the stress models of different contact forms are analyzed. Findings The results show that mechanical wear mainly occurs in the grit–workpiece contact area and increases gradually from contact area to entire SCD grit. The scratching forces vary with the mechanical wear progress of SCD grits. The SCD grit with point contact form is the most prone to produce wear. The SCD grit with face contact form can remove more material volume than the other two SCD grits, and it is the most wear resistant. The stress state is closely related with the mechanical wear of SCD grit. The contact form has a significant influence on the mechanical wear of SCD grit. Originality/value The results of this study can provide a theoretical basis for the fabrication of abrasive tools.

scholarly journals Experiment and Smooth Particle Hydrodynamics Simulation for the Wear Characteristics of Single Diamond Grit Scratching on Sapphire

Mechanika ◽  
2021 ◽  
Vol 27 (3) ◽  
pp. 244-250
Author(s):  
Haiyong Wu
Keyword(s):  
Stress State ◽  
Machining Process ◽  
Wear Volume ◽  
Smooth Particle Hydrodynamics ◽  
Sph Method ◽  
Workpiece Material ◽  
Diamond Grit ◽  
Wear Characteristics ◽  
Single Crystal Diamond ◽  
Particle Hydrodynamics

Abrasive single crystal diamond (SCD) grit is widely used in the machining process of sapphire. The wear of SCD grit has a significant influence on the surface quality of sapphire. In this paper, smooth particle hydrodynamics (SPH) method is employed to reveal the wear mechanism of SCD grit with Steinberg constitutive equation and Grüneisen state equation. The wear morphology, wear volume and scratching forces are measured and analyzed by combination of SPH simulations and experiments. The results show that the scratching forces fluctuate in a certain range and decrease with the increasing of workpiece material removal volume. Different degrees of cleavage and fracture appear in the front and rear of SCD grit. The shear stress and extrusion stress are the main stresses of SCD grit during the scratching process. The wear progress and wear form are mainly determined by the stress state. Different stress state leads to different wear progress of the SCD grit. The SPH method is able to reflect and illustrate the wear characteristics of SCD grit scratching on sapphire.

The influence of crystallographic orientation on wear characteristics during single abrasive diamond grit scratching on sapphire

2018 ◽  
Vol 70 (8) ◽  
pp. 1414-1421 ◽  
Author(s):  
Haiyong Wu ◽  
Hui Huang ◽  
Xipeng Xu
Keyword(s):  
Crystallographic Orientation ◽  
Design Methodology ◽  
Theoretical Foundation ◽  
Experimental Studies ◽  
Diamond Grit ◽  
Content Type ◽  
Wear Characteristics ◽  
Machining Quality ◽  
Single Crystal Diamond

Purpose The wear of an abrasive single-crystal diamond (SCD) grit affects the machining quality of the sapphire wafer. This paper aims to investigate the influence of crystallographic orientation on the wear characteristics of SCD grit scratching on sapphire. Design/methodology/approach The wear characteristics of two SCD grits (SCD100 and SCD111) with different crystallographic orientations were systematically investigated. The wear mechanism involved in the scratching process was explored. The wear morphology, scratching forces and friction coefficient during the scratching process were measured and analyzed. Findings The experiment results show that the wear progress of the two SCD grits is obviously different. The wear resistance of SCD111 grit is greater than that of SCD100 grit in normal wear stage. However, the SCD100 grit could remove more sapphire material than SCD111 grit. The SCD grits mainly sustain extrusion stress and shear stress during scratching on sapphire. The crystallographic orientation of SCD grits plays a significant role in the wear progress during scratching on sapphire. Originality/value The results of the experimental studies could provide a theoretical foundation for improving the fabrication of abrasive diamond tools.

scholarly journals B2B service brand identity and brand performance

2015 ◽  
Vol 49 (7/8) ◽  
pp. 1139-1162 ◽  
Author(s):  
Darren Andrew Coleman ◽  
Leslie de Chernatony ◽  
George Christodoulides
Keyword(s):  
Significant Influence ◽  
Structural Equation ◽  
Brand Management ◽  
Brand Identity ◽  
Equation Modeling ◽  
Brand Performance ◽  
Content Type ◽  
Visual Identity ◽  
Service Brand ◽  
The Uk

Purpose – This paper aims to apply the business-to-business (B2B) Service Brand Identity (SBI) scale to empirically assess the influence of service brand identity on brand performance for the first time. Design/methodology/approach – Based on data collected from 421 senior marketing executives, this paper applies the B2B SBI and structural equation modeling to fulfill the above purpose. Findings – Brand personality and human resource initiatives have a positive and significant influence on brand performance. Corporate visual identity, in addition to an employee and client focus, has an insignificant impact on performance. Consistent communications have a negative and significant influence on brand performance. Research limitations/implications – Data were only collected from executives in the UK. This research would benefit from replicative studies. Practical implications – This research empirically establishes the brand management activities that drive brand performance. Originality/value – This is the first empirical study to assess the influence service brand identity has on brand performance.

When social media met commerce: a model of perceived customer value in group-buying

2016 ◽  
Vol 30 (4) ◽  
pp. 398-410 ◽  
Author(s):  
Yong-Ki Lee ◽  
Sally Y. Kim ◽  
Namho Chung ◽  
Kwanghoon Ahn ◽  
Jong-Won Lee
Keyword(s):  
Social Media ◽  
Least Squares ◽  
Significant Influence ◽  
Customer Value ◽  
Design Methodology ◽  
Social Commerce ◽  
Research Directions ◽  
Content Type ◽  
Group Buying ◽  
Perceived Customer Value

Purpose Social commerce using social media has been on the rapid increase. Among various social commerce models, group-buying has become the mainstream. There is a paucity of research related to how customers perceive value in group-buying situations. This paper aims to examine and analyze various factors that influence perceived customer value in group-buying. Design/methodology/approach Data were collected using a survey on customers who had purchased a restaurant service deal on a group-buying site. A partial least squares technique was used to estimate the model. Findings Results show that perceived customer value affects customers’ group buying intentions and that all four antecedents of perceived value (low price, valence of experience, trust in social media and reputation of the group-buying site) have a significant influence. Implications and further research directions are discussed at the end of the paper. Originality/value This study provides valuable strategic implications for social commerce firms.

An investigation of trust in e-banking

2015 ◽  
Vol 38 (12) ◽  
pp. 1267-1284 ◽  
Author(s):  
Chian-Son Yu ◽  
Mehdi Asgarkhani
Keyword(s):  
Significant Influence ◽  
Holistic View ◽  
Banking Services ◽  
Content Type ◽  
Empirical Results ◽  
Other Information ◽  
Information And Communication ◽  
Structural Assurance ◽  
Antecedents And Consequences ◽  
Academic Implications

Purpose – The purpose of this paper is to understand the connection among trust’s antecedents, dimensions and consequences in the context of e-banking. Design/methodology/approach – A survey of 510 and 122 respondents in Taiwan and New Zealand (NZ), respectively, was conducted. Findings – The empirical results indicate that, first, not all trusts’ precursors the authors considered have significant influence on generating consumers’ trust and, second, that influential weights of these precursors on building consumer trust vary across consumers and cultures. Meanwhile, all factors on the e-banking side hold greatly significant influence on consumers’ trust in both NZ and Taiwan cases. Research limitations/implications – Practical and academic implications culled from the empirical results are discussed, and these implications may also be applicable to other information and communication technology (ICT) solutions and innovation banking services. Practical implications – Before banks shift their focus on to trust resources of consumer side, banks are advised to create clients’ trust from e-banking side, such as situational normality and structural assurance. Originality/value – This paper takes a holistic view to investigate the links between trust’s dimensions, antecedents and consequences in a single research structure, and the implications may also be applicable to other ICT solutions and innovative banking services.

Do young consumers care about ethical consumption? Modelling Gen Z's purchase intention towards fair trade coffee

2021 ◽  
Vol ahead-of-print (ahead-of-print) ◽  
Author(s):  
Zachary Robichaud ◽  
Hong Yu
Keyword(s):  
Peer Influence ◽  
Significant Influence ◽  
Fair Trade ◽  
Purchase Intention ◽  
Sustainable Consumption ◽  
Subjective Norms ◽  
Ethical Consumption ◽  
Convenience Sample ◽  
Content Type ◽  
Fair Trade Coffee

PurposeA global shift in ethical/sustainable purchase drivers highlights Generation Z (persons aged 15–24) as an important market for producers and marketers. Although much research has touched on fair trade consumption, very little has focused on Gen Z's consumption patterns. This study provides insights into and implications of younger consumers' motivations in ethical/sustainable consumption.Design/methodology/approachThis research examines Gen Z's purchase intention towards fair trade coffee with the theory of reasoned action framework. Data were collected with a convenience sample, and analyses were conducted using structural equation modelling.FindingsThe research found a significant influence of knowledge of fair trade towards product interest. Furthermore, general attitudes towards fair trade had a significant influence on product interest, product likeability and convenience. Lastly, product interest and subjective norms significantly influenced Gen Z's purchase intentions towards fair trade coffee.Originality/valueFindings suggest that Gen Z's shift in ethical/sustainable consumption revolves around their subjective norms or peer influence circles and contributes to the notions of self-branding, identify claims and social currency. Younger generations are digital natives, and social media has created a looking glass into their actions. This digital expansion has created more opportunities for individuals to monitor the actions of others and release information in real-time. Therefore, ethical/sustainable consumption by Gen Z can be used as a communication tool among their peers to project personal values and ideological shifts and to influence others close to them.

Design and topological optimization of rear pressure bulkhead for a typical aircraft

2021 ◽  
Vol ahead-of-print (ahead-of-print) ◽  
Author(s):  
Marshal Thakran ◽  
Meenakshi ◽  
Jitender Sharma ◽  
Charles Gilbert Martin
Keyword(s):  
Numerical Analysis ◽  
Significant Influence ◽  
Design Methodology ◽  
Structural Integrity ◽  
Topological Optimization ◽  
Content Type ◽  
Iterative Design ◽  
Practical Implications ◽  
Insight Into ◽  
Selection Of

Purpose The purpose of this paper is to evaluate the model of a rear pressure bulkhead with different design optimizations to meet the pressurized cabin requirements of an aircraft. Design/methodology/approach This paper presents the results of the static analysis of a dome-shaped rear pressure bulkhead model designed in Catia-v5. Numerical analysis of model meshed in hyper-mesh and solved using Opti-Struct for iterative design optimizations. Findings All the iterative models are analyzed at 9 Psi. Rear pressure bulkhead designed with L-section stringer shows better results than the model optimized with T-section stringer for the same thickness. The model optimized with L-shaped stinger also reduces the weight of the bulkhead without affecting the structural integrity. Practical implications It has been concluded in this paper that the selection of specific shapes of the stringers shows a significant influence on weight reduction. Originality/value This paper provides a topical, technical insight into the design and development of a rear pressure bulkhead. It also outlines the future development of dome-shaped rear pressure bulkhead.

Experimental and numerical study on cavitation under elastohydrodynamic lubrication point contact

2021 ◽  
pp. 135065012110527
Author(s):  
Mingfei Ma ◽  
Wen Wang ◽  
Wenxun Jiang
Keyword(s):  
Contact Area ◽  
Numerical Study ◽  
Ambient Pressure ◽  
Point Contact ◽  
Elastohydrodynamic Lubrication ◽  
Hertzian Contact ◽  
Pressure Area ◽  
Cavitation Pressure ◽  
Experimental Researches ◽  
State 1

As a common phenomenon in elastohydrodynamic lubrication, cavitation has an effect on the completeness of the oil film in the contact area. Many studies have therefore been conducted on cavitation. Experimental researches on cavitation usually rely on optical interference observation, which offers a limited resolution and observation range. In this paper, an infrared thermal camera is used to observe the cavity bubbles on a ball-on-disc setup under sliding/rolling conditions. The results show that the cavity length increases with an increases of the entrainment speed and the viscosity of the lubricants. These observations are explained by a numerical model based on Elrod's algorithm. Effects of entrainment speed and lubricant viscosity on the breakup of cavitation bubbles and the cavitation states are investigated. Both the simulation and experimental results show that a negative pressure area is present behind the Hertzian contact area. The ambient pressure plays a role in maintaining cavitation state 1. The cavitation pressure is close to the vacuum pressure when the entrainment speed is low and to the ambient pressure instead when the entrainment speed is high.

The influence of spatial design characteristics on low-rise residential neighbourhoods in Basra city

2014 ◽  
Vol 7 (4) ◽  
pp. 559-585
Author(s):  
Hani Alahmed ◽  
Wa’el Alaghbari ◽  
Rahinah Ibrahim ◽  
Azizah Salim
Keyword(s):  
Social Interaction ◽  
Social Interactions ◽  
Significant Influence ◽  
Statistical Data ◽  
Residential Building ◽  
Content Type ◽  
Spatial Design ◽  
Two Factors ◽  
Design Characteristics

Purpose – This paper aims to investigate the ways that could enhance residents’ social interaction in low-rise residential building neighbourhoods of Basra city in Iraq. The lack of social interaction among residents of Basra city prompted the authors to frame a strategy for this case study. Design/methodology/approach – The spatial design characteristics of low-rise residential building neighbourhoods implicated to support the residents in terms of social interactions in comparison to those exhibited by a single home and traditional neighbourhoods. The statistical data demonstrated that by using this strategy, several unique features of secured, collective, responsive and supportive spaces could enhance the residents’ social interaction. Findings – This study found that all collective space factors have a significant influence on social interaction. “Fostering proper proximity and accessibility” factor was ranked first and the most significant factor with an influence on social interaction. Secured spaces (hierarchical spatial structure, physical security supports and construct) have a significant influence on social interaction. The most interesting finding in this study is that all factors of the supportive spaces construct have a significant influence on social interaction. Finally, this study showed that two factors of the responsive spaces construct, increasing variety and increasing legibility, have an insignificant influence on social interaction. Originality/value – The design of low-rise residential building neighbourhoods in Basra city may be used to develop social interaction as the contributing factor for maintaining values of traditional neighbourhood communities. This study highlights certain recommendations for architects, especially urban designers, to reinforce residents’ social interaction in low-rise residential building neighbourhoods in Basra city.

Public reporting on food safety incidents in China: intention and its determinants

2018 ◽  
Vol 120 (11) ◽  
pp. 2615-2630 ◽  
Author(s):  
Shijiu Yin ◽  
Ying Li ◽  
Yusheng Chen ◽  
Linhai Wu ◽  
Jiang Yan
Keyword(s):  
Food Safety ◽  
Influencing Factors ◽  
Significant Influence ◽  
Subjective Norm ◽  
Moral Norm ◽  
Descriptive Norm ◽  
Injunctive Norm ◽  
Content Type ◽  
Safety Reporting ◽  
Reporting Behaviour

Purpose The purpose of this paper is to analyse the factors that influence food safety reporting intention and behaviour of the public. Design/methodology/approach Data used in this study came from a questionnaire survey conducted in Shandong Province, China. The 642 qualified samples were analysed through structural equation model based on the expanded theory of planned behaviour to study public food safety reporting behaviour and its influencing factors. Findings Results indicated that participation attitude, subjective norm, perceived behavioural control (PBC) and moral norm had significantly positive effects on public reporting intention, which had a direct effect on behaviour. Among subjective norm, descriptive norm had a more significant influence on the intention to report than injunctive norm. PBC indirectly affected reporting behaviour through participation intention, and directly affected participation behaviour. Socio-demographic variables had significant influence on participation attitude, injunctive norm and PBC, whereas these variables had no influence on descriptive norm and moral norm. Originality/value This research is of academic value and of value to policy makers. To promote public participation in food safety reporting, the government should consider influencing factors of food safety reporting.

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