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1 – 4 of 4Song Yanjiang, Zhu Peng, Wang Xiaodong and Huang Pei
The purpose of this paper is to provide some useful information on the tribological performance of thermoplastic polyimide (TPI) reinforced with rigid glass fillers of different…
Abstract
Purpose
The purpose of this paper is to provide some useful information on the tribological performance of thermoplastic polyimide (TPI) reinforced with rigid glass fillers of different shapes and sizes under dry, water, and oil lubrication conditions.
Design/methodology/approach
Rigid glass fillers of different shapes and sizes are chosen to modify TPI and its mechanical properties are measured. The stress‐strain behaviors of the composites are simulated by the finite element method and the effect of filler morphology is also considered. Furthermore, the tribological performance of the composites is investigated in different environmental media, including air, water, and oil.
Findings
It is demonstrated that the toughness of the materials decreases on filling them with rigid glass, and that stress concentration causes cracks around the spherical glass beads, which reduces the material impact strength. Owing to heat moulding technology, glass fiber has certain orientation and absorbs the impact energy effectively. A better wear‐resistant material is obtained by choosing a bigger filler due to its higher bond strength with the matrix. Under water and oil lubrication, the fatigue failure is the main reason for material wear, and fiber‐reinforced TPI has favorable wear‐resistance due to its shape. Meanwhile, glass beads could roll on the contact surface, which polishes the surface and reduces the friction coefficient, and its effect is reduced on oil lubrication for its high viscosity.
Originality/value
This paper analyzes the effect of rigid glass fillers of different shapes and sizes on the mechanical properties and tribological performance of polyimide composites.
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Yanjiang Huang, Yanglong Zheng, Nianfeng Wang, Jun Ota and Xianmin Zhang
The paper aims to propose an assembly scheme based on master–slave coordination for a compliant dual-arm robot to complete a peg-in-hole assembly task.
Abstract
Purpose
The paper aims to propose an assembly scheme based on master–slave coordination for a compliant dual-arm robot to complete a peg-in-hole assembly task.
Design/methodology/approach
The proposed assembly scheme is inspired by the coordinated behaviors of human beings in the assembly process. The left arm and right arm of the robot are controlled to move alternately. The fixed arm and the moving arm are distinguished as the slave arm and the master arm, respectively. The position control model is used at the uncontacted stage, and the torque control model is used at the contacted stage.
Findings
The proposed assembly scheme is evaluated through peg-in-hole assembly experiments with different shapes of assembly piece. The round, triangle and square assembly piece with 0.5 mm maximum clearance between the peg and the hole can be assembled successfully based on the proposed method. Furthermore, three assembly strategies are investigated and compared in the peg-in-hole assembly experiments with different shapes of assembly piece.
Originality/value
The contribution of this study is that the authors propose an assembly scheme for a compliant dual-arm robot to overcome the low positioning accuracy and complete the peg-in-hole assembly tasks with different shapes parts.
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Zhou Jiang, Yiqi Jiang and Ingrid Nielsen
Workplace thriving is a psychological state that promotes employee health and development. In addition to presenting a useful instrument that captures the nature of a thriving…
Abstract
Purpose
Workplace thriving is a psychological state that promotes employee health and development. In addition to presenting a useful instrument that captures the nature of a thriving work life in China, the purpose of this paper is to investigate important factors that influence one’s thriving status within this national context.
Design/methodology/approach
Using diverse approaches across different samples, Study 1 contextualized the content of a workplace thriving scale (WTS) to fit the Chinese context. Study 2 tested the effects of learning goal orientation, exploration at work and role ambiguity on workplace thriving, employing a mediation model. As a supplement, Study 3 examined the test–retest reliability of workplace thriving.
Findings
Study 1 confirmed that in the Chinese setting, workplace thriving is a higher order construct represented by both a sense of learning and a sense of vitality. Study 2 found that learning goal orientation and exploration at work fostered thriving, while role ambiguity reduced thriving. Also, exploration mediated the relationship between learning goal orientation and thriving. Study 3 verified that the WTS was reliable over time in the Chinese setting, further increasing the reliability of results from Studies 1 and 2.
Originality/value
By rigorously and formally contextualizing the concept/construct of workplace thriving in China, this paper is informative for future research on thriving at work in Eastern cultures.
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