Song Quan, Guo Yong, Gong Jun, Xuedong Liu, Jin Yongping and Yang Shuyi
This paper aims to study the frictional performance of reciprocating pair with high velocity by using hydrodynamic lubrication principle and fish scale textured piston model.
Abstract
Purpose
This paper aims to study the frictional performance of reciprocating pair with high velocity by using hydrodynamic lubrication principle and fish scale textured piston model.
Design/methodology/approach
Based on the idea of function characteristic approximation and coordinate change, a mathematical representation model of imitating fish scale texture pit section is established. According to the principle of dynamic pressure lubrication of the textured fluid, a three-dimensional numerical model of flow field for fish scale texture is established without considering cavitation. Numerical analysis of the model carp scale texture unit by orthogonal experimental design and FLUENT software is carried out.
Findings
Effects of fish scale pit texture on friction properties for a reciprocating pair piston surface with high velocity (impact piston) are acquired. Effects of texture characterization parameters and flow rate on the surface friction performance for impact piston are found. Effects of different characteristic parameters combination of imitating fish scale texture on friction performance for impact piston surface are obtained.
Originality/value
The model is an effective tool to study the friction and wear of reciprocating pair with high velocity. The effects of fish scale textured piston pair supply a theory lead to design the reciprocating pair with better friction performance.
Peer review
The peer review history for this article is available at: https://publons.com/publon/10.1108/ILT-09-2019-0398
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Keywords
Marcia Texler Segal, Vasilikie Demos and Esther Ngan-ling Chow
Purpose/approach – This introduction sets forth the main themes of the volume, reviews the methods employed by its contributors, and demonstrates the relationships among the…
Abstract
Purpose/approach – This introduction sets forth the main themes of the volume, reviews the methods employed by its contributors, and demonstrates the relationships among the chapters.
Research implications – The introduction demonstrates the ways gender research engages topics of current social, economic, and political importance and the ways in which focus on these topics advances an intersectional approach to gender research.
Practical and social implications – Drawing on each of the chapters, the authors point to the ways in which the global movement of people, media, and ideas foster changes in self-concepts, behavior, and social policy.
Value of the chapter – The essay serves as an overall introduction to the volume.
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Feng Tai, Fu Guo, Jianping Liu, Zhidong Xia, Yaowu Shi, Yongping Lei and Xiaoyan Li
The purpose of this paper is to investigate the creep properties of Sn‐0.7Cu composite solder joints reinforced with optimal nano‐sized Ag particles in order to improve the creep…
Abstract
Purpose
The purpose of this paper is to investigate the creep properties of Sn‐0.7Cu composite solder joints reinforced with optimal nano‐sized Ag particles in order to improve the creep performance of lead‐free solder joints by a composite approach.
Design/methodology/approach
The composite approach has been considered as an effective method to improve the creep performance of solder joints. Nano‐sized Ag reinforcing particles were incorporated into Sn‐0.7Cu solder by mechanically mixing. A systematic creep study was carried out on nano‐composite solder joints reinforced with optimal nano‐sized Ag particles and compared with Sn‐0.7Cu solder joints at different temperatures and stress levels. A steady‐state creep constitutive equation for nano‐composite solder joints containing the best volume reinforcement was established in this study. Microstructural features of solder joints were analyzed to help determine their deformation mechanisms during creep.
Findings
The creep activation energies and stress exponents of Ag particle‐enhanced Sn‐0.7Cu lead‐free based composite solder joints were higher than those of matrix solder joints under the same stress and temperature. Thus, the creep properties of nano‐composite solder joints are better than those of Sn‐0.7Cu solder joints.
Originality/value
The findings indicated that nano‐sized Ag reinforcing particles could effectively improve the creep properties of solder joints. A new steady‐state creep constitutive equation of nano‐composite solder joints was established. Deformation mechanisms of Sn‐0.7Cu solder and nano‐composite solder joints during creep were determined.
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Cay Anderson-Hanley, Ph.D., is assistant professor of psychology at Union College in Schenectady, NY. She obtained her doctorate from the University at Albany, and completed a…
Abstract
Cay Anderson-Hanley, Ph.D., is assistant professor of psychology at Union College in Schenectady, NY. She obtained her doctorate from the University at Albany, and completed a postdoctoral fellowship in geriatric neuropsychology at UCLA. Her scientific work has focused on the neuropsychological effects of aging, cancer, and exercise interventions. She teaches clinically oriented courses, including psychological assessment. Cay has served as a co-PI on the NSF Advance grant awarded to Skidmore and Union Colleges since 2008, and contributed to the development and analysis of the climate survey utilized in the chapter in this volume. She has interest in understanding and finding solutions for the challenges of achieving professional-personal life balance for all faculty members, especially as it pertains to facilitating women's advancement in the sciences.