Xiangyu Du, Junying Yang, Fei Gao, Xiaoming Han and Linlin Su
This paper aims to reveal the effects of the copper third body on different copper matrix friction materials with a novel experimental way called “exogenous powder.”
Abstract
Purpose
This paper aims to reveal the effects of the copper third body on different copper matrix friction materials with a novel experimental way called “exogenous powder.”
Design/methodology/approach
An accurate adding device of exogenous copper powder was designed to control the flow rate. The tribological properties with and without exogenous copper powder were investigated by a pin-on-disc tribometer during dry sliding.
Findings
Experimental results indicate that the Cu addition tends to increase the friction coefficient. For pure Cu material, the exogenous copper third body exhibits poor fluidity on the friction surface, causing serious adhesive wear on the friction interface. For the Cu 90% + 10% Gr material, the plasticity of exogenous copper powder may intensify the deformation of the third body of the surface, presenting layered accumulation distribution. For the pure Cu and Cu 95% + 5% SiO2 material, the Cu addition makes the composition and density of the third body uneven in the direction of depth.
Originality/value
The role of the copper component on different materials is revealed from a new perspective, and the relationship between the third body structure and the friction properties is explored.
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Keywords
Chong Zhao, Manqi Yao, Xiaoming Han, Wei Qi, Linlin Su, Rong Fu and Fei Gao
This study aims to analyze the temperature difference between aluminum-based brake disc (ABD) and cast steel brake disc (CSBD) for rail vehicles in the braking process, which is…
Abstract
Purpose
This study aims to analyze the temperature difference between aluminum-based brake disc (ABD) and cast steel brake disc (CSBD) for rail vehicles in the braking process, which is related to the popularization and use of ABD.
Design/methodology/approach
Two friction pairs composed of ABD, CSBD and copper-based powder metallurgy brake pad were studied in this paper. The temperature characteristics of the two friction pairs were compared by 1:1 braking test and simulation calculation.
Findings
When the speed is 160–250 km/h and the braking pressure is 18 and 29 kN, the calculated maximum temperature of CSBD is 574°C and 681°C, respectively, which is higher than that of ABD 49°C–148°C and 73°C–217°C. Under the test conditions, the maximum temperature of CSBD is 487°C and 624°C respectively, which is higher than that of ABD 63°C–95°C and 63°C–188°C. The temperature difference between ABD and CSBD increases with the increase of braking pressure and speed. The surface temperature distribution of CSBD is “three-peak,” whereas that of ABD is “single-peak.”
Originality/value
This paper reveals the temperature difference between ABD and CSBD and provides data support for promoting the use of ABD.
Peer review
The peer review history for this article is available at: https://publons.com/publon/10.1108/ILT-08-2024-70320/
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Youjie Chen, Rong Fu, Junying Yang, En Zhang, Linlin Su and Fei Gao
This study aims to clarify the relationship between the coefficient of friction (COF) and temperature of aluminum-based brake discs.
Abstract
Purpose
This study aims to clarify the relationship between the coefficient of friction (COF) and temperature of aluminum-based brake discs.
Design/methodology/approach
Three friction blocks with different COFs are examined by a TM-I-type reduced-scale inertial braking dynamometer. On this basis, the thermo-mechanically coupled model of friction pairs is established to study the evolution of brake disc temperature under different COFs using ADINA software.
Findings
Results indicate that the calculated disc temperature field matches the experimental well. The effect of COF on the peak temperature is magnified by the braking speed. With the COF increasing, the rise rate of instantaneous peak temperature is accelerated, and the dynamic equilibrium period and cooling-down period are observed in advance. The increase in COF promotes the area ratio of the high-temperature zone and the maximum radial temperature difference. When the COF is increased from 0.245 to 0.359 and 0.434 at 140 km/h, the area ratio of high-temperature zone increases from 12% to 44% and 49% and the maximum radial temperature difference increases from 56°C to 75°C and 83°C. The sensitiveness of the axial temperature difference to the COF is related to the braking time. The maximum axial temperature difference increases with COF in the early stages of braking, while it is hardly sensitive to the COF in the later stages of braking.
Originality/value
The effect of COF on the aluminum-based brake disc temperature is revealed, providing a theoretical reference for the popularization of aluminum-based brake discs and the selection of matching brake pads.
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Shixuan Fu, Jingjing Yang and Linlin Su
COVID-19 affects the peer-to-peer (P2P) accommodation industry. With regard to prospect theory, individuals’ negative emotions, such as institutional distrust, are easily evoked…
Abstract
Purpose
COVID-19 affects the peer-to-peer (P2P) accommodation industry. With regard to prospect theory, individuals’ negative emotions, such as institutional distrust, are easily evoked and impede consumption intention in an environment of permeating uncertainty and risks. While existing research indicates the negative effects of institutional distrust, scant research has explored its antecedents and intervention mechanisms. This study thus aims to unveil the influencing factors and explore mitigating mechanisms of customers’ institutional distrust of P2P accommodations.
Design/methodology/approach
Online reviews data were used to identify the underlying critical issues. The authors developed a model to depict how institutional distrust is formed under the boundary condition of subjective norm by the results. The model was verified using a questionnaire survey. Finally, in-depth semi-structured interviews were conducted to ensure its robustness.
Findings
The external environment and internal platform effectiveness are two critical aspects affecting institutional distrust of P2P accommodations. The external environment influences institutional distrust through perceived threat, explaining the formation mechanism of customers’ institutional distrust through customers’ internal psychology. Furthermore, the authors found subjective norm moderating the effect of perceived threat on customers’ institutional distrust.
Research limitations/implications
This is one of the first studies, to the best of the authors’ knowledge, to explore institutional distrust of P2P accommodations after COVID-19. The finding contributes to studies on P2P accommodation by uncovering the contingent role of subjective norm in influencing customers’ institutional distrust.
Originality/value
This is a pioneering study that explores the antecedents and mitigating mechanisms of institutional distrust of P2P accommodations during the new normal of COVID-19.
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Sihua Chen, Linlin Su and Xusen Cheng
The Physical Internet (PI) provides solutions to improve the current unsustainable economically logistics systems. This paper aims to identify the key themes and point out the…
Abstract
Purpose
The Physical Internet (PI) provides solutions to improve the current unsustainable economically logistics systems. This paper aims to identify the key themes and point out the gaps to demonstrate the current state of the PI deployment in the industry. Furthermore, this paper attempts to provide possible opportunities for future research to lead research directions of PI deployment in the industry.
Design/methodology/approach
This paper follows the methodology of systematic literature review (SLR) including five processes of (1) identifying the search process; (2) selecting publications following the criteria that include and/or exclude a publication; (3) evaluating and analyzing the chosen literature; (4) reporting findings and (5) synthesizing future research opportunities. A total of 88 papers ranging from 2011 to 2021 were selected and coded for analysis.
Findings
This paper has identified 7 themes, including the PI concepts, assessments of the PI, components of the PI, innovative facilities applied in the PI, collaboration in the PI, the PI implementation and literature review. Meanwhile, five key methodologies including experimental, exploratory, review, design science research as well as mixed-methods have been classified. A framework has been proposed to summarize the results incorporating the real-life industries involved in the existing research. The authors also present the research gaps and future research opportunities for the PI deployment in industries.
Originality/value
This study is one of the first research focusing on the PI real-life implementation and thus contributes to the PI literature differing from other literature review papers. The proposed framework is useful to learn about the current core research themes in the PI. The discussion of future research opportunities may inspire interesting research delving into the field.
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Youjie Chen, Fei Gao, Rong Fu, Linlin Su, Xiaoming Han and Junying Yang
This study aims to clarify the relationship of friction material type and brake disc temperature through braking experiment.
Abstract
Purpose
This study aims to clarify the relationship of friction material type and brake disc temperature through braking experiment.
Design/methodology/approach
The braking performances of resin materials (RM), semimetallic materials (SM) and copper-based powder metallurgy materials (PM) friction blocks mating with forged steel brake disc were examined based on TM-I-type reduced-scale inertial braking dynamometer. The brake disc surface temperature was recorded by infrared thermal camera during braking.
Findings
Experimental results indicate that the thermal wear resistance of three friction materials differs with mental content, resulting in the deviation of pad-disc system contact state during braking, thus forming different temperature distribution on the brake disc surface. The peak temperature on the disc face of RM (190°C) is 36.6% and 45.4% lower than that of PM (300°C) and SM (348°C) at 160 km/h. The maximum radial temperature deviation of PM (35°C) is approximately three times than that of RM (12°C) and 40% higher than that of SM (25°C) at 50 km/h, whereas the maximum temperature deviation of SM (97°C) is six times than that of RM (16°C) and 31% higher than that of PM (74°C) at 160 km/h.
Originality/value
The effect of friction material type on the disc surface temperature distribution is revealed, which provides a meaningful reference for the design of brake friction pairs and choice of brake pad materials.
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Shan Chen, Meiqi Fang, Linlin Wang, Jiafu Su and Junbo Tuo
This paper intends to address the decision-making and coordination of green supply chain (GSC) considering risk-averse manufacturers under mixed carbon policy.
Abstract
Purpose
This paper intends to address the decision-making and coordination of green supply chain (GSC) considering risk-averse manufacturers under mixed carbon policy.
Design/methodology/approach
This paper focuses on a GSC consisting of a manufacturer and a retailer, in which the manufacturer is risk-averse (R-A). This paper employs Stackelberg game theory and mean variance analysis to assess the pricing decision-making process under various scenarios. Furthermore, cost-sharing contracts are introduced to coordinate the GSC.
Findings
The research results suggest that the green level of the product and the profit of the GSC under a centralized scenario are higher than those under a decentralized scenario, while the retail price is lower. Under the decentralized scenario, the green level of product, wholesale price and manufacturer’s profit in the R-A scenario are lower than the values in the risk-neutrality scenario, while retailer's profit is higher. In addition, when a cost-sharing contract is utilized for coordination in the GSC, it can lead to Pareto improvement, regardless of whether the manufacturer makes risk-neutrality or R-A decisions.
Originality/value
This research provides a deeper understanding of GSC decision-making and coordination strategy under mixed carbon policy with consideration of R-A from a theoretical perspective and provides decision support for enterprises to choose strategies in practice.
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This study extends the literature on top management team (TMT) diversity and innovation by introducing entrepreneurial passion diversity as an important TMT affective component in…
Abstract
Purpose
This study extends the literature on top management team (TMT) diversity and innovation by introducing entrepreneurial passion diversity as an important TMT affective component in determining firm innovation performance. This paper draws on the knowledge-based view and proposes that TMT passion diversity, in terms of intensity separation and focus variety, may hinder the process of knowledge creation, and, in turn, reduce firm innovation performance.
Design/methodology/approach
The authors conduct a questionnaire survey using a simple random sampling technique and collect data from 195 small- and medium-sized enterprises in China. Ordinary least squares regression and a structural equation model are applied to test the hypotheses.
Findings
This study finds that TMT passion intensity separation has a negative effect on firm innovation performance via knowledge exchange and knowledge combination. TMT passion focus variety has a negative effect on firm innovation performance via knowledge combination.
Originality/value
This study highlights the affective diversity of entrepreneurial passion in TMTs and clarifies the detrimental role of TMT entrepreneurial passion diversity in innovation and knowledge creation. It contributes new insights to the literature on TMT diversity, knowledge management and entrepreneurial passion.
Details
Keywords
Although prior research highlights the organizational and cognitive challenges associated with achieving innovation ambidexterity, comparatively limited attention has been paid to…
Abstract
Purpose
Although prior research highlights the organizational and cognitive challenges associated with achieving innovation ambidexterity, comparatively limited attention has been paid to the affective characteristics that may differentiate top management teams (TMTs) of firms. The authors build on emerging research and identify TMT entrepreneurial passion diversity as an affective characteristic with particular relevance to innovation ambidexterity.
Design/methodology/approach
Based on data collected from 195 small- and medium-sized enterprises in China, this study uses ordinary least squares regression models to test the hypotheses.
Findings
The results show that TMT passion intensity separation is negatively related to innovation ambidexterity, while TMT passion focus variety has an inverted U-shaped relationship with innovation ambidexterity. In addition, environmental dynamism weakens the effects of TMT passion intensity separation and strengthens the effects of passion focus variety.
Originality/value
This study pushes forward the research agenda on affective microfoundations of innovation ambidexterity. It also reveals the potential dark side of TMT entrepreneurial passion by explicitly delineating its effects on innovation management.
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Jiawen Chen, Linlin Liu and Yong Wang
This study investigates business model innovation in small- and medium-sized manufacturing enterprises (SMEs) and its impact on firm growth.
Abstract
Purpose
This study investigates business model innovation in small- and medium-sized manufacturing enterprises (SMEs) and its impact on firm growth.
Design/methodology/approach
The study was based on analyzing data collected through a questionnaire survey. Structural equation modeling was applied to test the hypotheses.
Findings
Business model innovation has a positive effect on SME growth in the manufacturing sectors. Moreover, growth is also achieved through the indirect effect of business model innovation on customer trust and commitment.
Practical implications
Managers will benefit from understanding how business model innovation can help their companies to overcome resource constraints and achieve sustained growth. When manufacturing SMEs engage in modular or structural changes to their business model, they may find it worthwhile to focus on maintaining a relationship of trust and commitment with their customers.
Originality/value
This study highlights business model innovation as a unique and important, yet underexplored, factor in manufacturing SME growth. The findings also untangle the complex processes of customer relationship management by which business model innovation improves manufacturing competitive advantage for SMEs.