The Tribology Design in Transport Machinery Design

2014 ◽  
Vol 602-605 ◽  
pp. 148-150
Author(s):  
Guo Xin Zhang ◽  
Min Li ◽  
Jiang Wei Cao
Keyword(s):  
Service Life ◽  
Structural Design ◽  
Friction And Wear ◽  
Surface Design ◽  
Material Choice ◽  
Machinery Design

A common problem in transport machinery equipment is friction and wear. This problem largely affects the service life in a transport machinery equipment. It should be given enough attention to the tribology design in transport machinery design. This article mainly describe the tribology design content from the material choice, surface design, structural design to lubrication technology, etc.

Research on Friction and Wear of Gear Transmission with Meshed Medium Belt

2013 ◽  
Vol 753-755 ◽  
pp. 1719-1722 ◽  
Author(s):  
Zhi Min Fan ◽  
Hui Xia Yang
Keyword(s):  
Service Life ◽  
Direct Effect ◽  
Wear Mechanism ◽  
Friction And Wear ◽  
Transmission System ◽  
Gear Transmission ◽  
New Type ◽  
Vibration Noise

As a new type of gear transmission, the gear transmission with meshed medium belt has advantages of reducing vibration noise and friction damage on the gear surface. During the process of the gear transmission with meshed medium belt, the friction and wear is mainly occurred on the medium belt, so the service life of the medium belt has a direct effect on the performance and efficiency of the transmission system. The friction and wear mechanism of the medium belt is researched and effective ways to prolong the service life of the medium belt are given in this paper.

Experiment Study on Dynamic Response of Rough AC Surface under Vehicle

2011 ◽  
Vol 243-249 ◽  
pp. 4366-4372
Author(s):  
Guang Hai Zhang ◽  
Hai Gui Kang ◽  
Yuan Xun Zheng
Keyword(s):  
Service Life ◽  
Dynamic Response ◽  
Structural Design ◽  
Asphalt Pavement ◽  
Road Surface ◽  
Dynamic Responses ◽  
Experiment Study ◽  
Asphalt Road

In order to study dynamic response of rough road surface resulting from different speeds and loads under a certain roughness for purpose of effective enhancement pertinence for structural design of an asphalt pavement and extension of its service life, displacement meters, stress meters and strain meters are embedded at different structural layers on the rough road surface to monitor the dynamic responses of AC pavement. The result shows that roughness can dramatically increase response on an asphalt road surface resulting from load and speed.

scholarly journals Coordinating influence of multilayer graphene and spherical SnAgCu for improving tribological properties of a 20CrMnTi material

RSC Advances ◽  
2018 ◽  
Vol 8 (25) ◽  
pp. 14129-14137 ◽  
Author(s):  
Xiaoxue Li ◽  
Jingli Xu
Keyword(s):  
Service Life ◽  
Tribological Properties ◽  
Friction And Wear ◽  
Wear Behavior ◽  
Operational Reliability ◽  
Multilayer Graphene ◽  
Friction And Wear Behavior

In order to increase the service life and operational reliability of a 20CrMnTi-steel-based gearing system, the friction and wear behavior of 20CrMnTi needs to be further improved.

I35W Bridge Collapse: Design Issues in Past and Challenges Revealed for Future

2010 ◽  
Author(s):  
Su Halo
Keyword(s):  
Service Life ◽  
Structural Design ◽  
Preliminary Analysis ◽  
Steel Bridges ◽  
Lessons Learned ◽  
Transportation Safety ◽  
Design Issues ◽  
The Past ◽  
Bridge Collapse ◽  
Safety Assessments

The past several decades can be remembered as the most successful period for engineering, which has also brought up great challenges to engineers to digest rapidly-developed ideas, new tools, and novel methodologies while to assure industrial designs and daily operations being safe, economic, and technologically advancing. This article discusses some particular issues in structural design, focused on the lessons learned from the highway I35W Bridge’s collapse that occurred at August 1st, 2007, based on a preliminary analysis of this disaster and an associated report submitted to the related administrative agencies [27]. By comparing the results in that report with the materials’ evidences of National Safety Transportation Safety Board (NTSB) official investigation [1,2] and the recent in-depth analyses [28,29], it seems that the issues addressed early may still have certain significance for the safety assessments of those similarly-structured steel bridges today. A bridge’s service life is 75 years or longer. According to a NTSB’s document [37], there are more than hundreds this kind of bridges still on service [4].

Friction and wear behavior of hydrogenated diamond-like carbon coating against titanium alloys under large normal load and variable velocity

2017 ◽  
Vol 69 (2) ◽  
pp. 199-207 ◽  
Author(s):  
Jun Liu ◽  
Zhinan Zhang ◽  
Zhe Ji ◽  
Youbai Xie
Keyword(s):  
Friction Coefficient ◽  
Service Life ◽  
Carbon Coating ◽  
Friction And Wear ◽  
Wear Behavior ◽  
Normal Load ◽  
Diamond Like Carbon ◽  
Content Type ◽  
Friction And Wear Behavior ◽  
Dlc Coating

Purpose This paper aims to investigate the effects of reciprocating frequency, large normal load on friction and wear behavior of hydrogenated diamond-like carbon (H-DLC) coating against Ti-6Al-4V ball under dry and lubricated conditions. Design/methodology/approach The friction and wear mechanisms are analyzed by scanning electron microscope, energy dispersive spectroscopy and Raman spectroscopy. Findings The results show that as reciprocating frequency increases under lubricated conditions, the friction coefficient decreases first and then increases. When the reciprocating frequency is 2.54 Hz, the value of friction coefficient reaches the minimum. The friction reduction is because of the transformation from sp3 to sp2, the formation of transfer layer on Ti-6Al-4V ball and the reduction in viscous friction, whereas the increase of friction coefficient is related to wear. In dry conditions, the friction coefficient is between 0.06 and 0.1. And, the service life of H-DLC coating decreases with the increase in reciprocating frequency and normal load. Research limitations/implications It is confirmed that adding the lubricant could prolong the service life of H-DLC coating and reduce friction and wear efficiently. And, the wear mechanisms under dry and lubricated conditions encompass abrasive wear and adhesive wear. Originality/value The results are helpful for application of diamond-like carbon coating.

Experimental Study on Anti-Fatigue Damage Structural Design of Diesel Engine Bearings

2012 ◽  
Vol 214 ◽  
pp. 97-101
Author(s):  
Zhen Jie Guo
Keyword(s):  
Experimental Study ◽  
Fatigue Life ◽  
Diesel Engine ◽  
Service Life ◽  
Fatigue Damage ◽  
Working Conditions ◽  
Structural Design ◽  
Connecting Rod ◽  
Main Bearing ◽  
Modern Times

With higher requirements on energy-saving and environmental protection of diesel engine in the modern times, the loads on main bearing and connecting rod bearing of diesel engine are continuously increased, and also working conditions are even more critical. Bearings are the key moving parts of diesel engine, and play an important influence on reliability, service life and other performances of diesel engine. Therefore, the reasons for fatigue damages to its bearings greatly affect fatigue life. In traditional designs, effects of the problem are studied few. In this paper, therefore, this problem is studied for discussing the formation reasons and solutions for it theoretically.

Structural Fatigue Analysis of a Container Crane

2012 ◽  
Vol 159 ◽  
pp. 272-276
Author(s):  
Shi Qing Lu ◽  
Han Bin Xiao ◽  
Ping Deng
Keyword(s):  
Fatigue Life ◽  
Service Life ◽  
Data Processing ◽  
Structural Design ◽  
Time History ◽  
Structural Fatigue ◽  
Container Crane ◽  
Collection Data ◽  
Damage Law

This paper presents an approach to evaluate the structural fatigue life of port cranes. Based on a testing of 40t/45m container crane in a port of China, the stress time-history collection, data processing, the determination of S-N curve and the distribution of the load amplitude is analyzed in detail. Finally, the modified linear cumulative damage law is employed to evaluate the remaining safety service life of the container crane. The result of this study can be a reference for the anti-fatigue structural design of cranes, and it also provides a guideline for ports’ management and maintenance departments to make maintenance plans for port cranes.

Verankerung der Stützmauer Entschigtal / Anchorage of the Sustaining Wall Entschigtal

1997 ◽  
Vol 3 (6) ◽  
pp. 619-632
Author(s):  
M. Schmid
Keyword(s):  
Service Life ◽  
Bearing Capacity ◽  
Structural Design ◽  
Test Methods ◽  
Actual State ◽  
Complex Task ◽  
Load Bearing Capacity ◽  
Load Bearing ◽  
Required Service

Abstract Structural design and the position of the sustaining wall Entschigtal were at the origin of corrosion of the back layer of reinforcement. A drecrease of the load bearing section was observed in 1995. The assessment of the actual state of the reinforcement turned out to be a complex task in the context of the inspection of the structure. It was the combination of different test methods which finally led to reliable results concerning the extent and the position of corrosion of reinforcement. In order to restore the load bearing capacity for the remaining required service- life consolidation measures werde necessary. Permanent strand anchors have been placed to strengthen the wall.

Effect of the micro-structure evolution of friction layer on the sliding tribology behavior of TiAl-10 Wt.% Ag at 16 N-0.5 m/s

2018 ◽  
Vol 70 (9) ◽  
pp. 1676-1683
Author(s):  
Kang Yang ◽  
Hongru Ma ◽  
Xiyao Liu ◽  
Yangming Zhang
Keyword(s):  
Service Life ◽  
Friction And Wear ◽  
Three Dimensional ◽  
Deep Understanding ◽  
Structure Evolution ◽  
Micro Structure ◽  
Wear Properties ◽  
Content Type ◽  
Wear Rates ◽  
Mechanical Components

Purpose This paper aims to study the micro-structure evolution of friction layers to optimize the friction and wear behaviors of TiAl-based material. It further enlarges the scope of using TiAl alloys and increase in the service life of TiAl alloy-made mechanical components, especially under some extreme conditions. Design/methodology/approach To study the structure evolution of friction layers, the HT-1000 tribometer is used to study the friction and wear properties of as-prepared samples. With the assistance of field emission scanning electron microscopy and an electron probe micro-analyzer, the stratified structures in cross-sections and a surface morphology of the wear scars are well characterized. A ST400 surface profiler helps in better understanding of the three-dimensional texture profiles of wear scars. X-ray diffractometer (XRD) is also used to analyze phases in the as-prepared samples. Findings An analysis method on the micro-structure evolution can provide better views to understand the influence of friction layers on the tribological behavior, at different wear stages. It finds that the micro-structure evolution of friction layers has an immediate effect on the friction coefficients and wear rates of TiAl-based material. It also proves to be a useful tool for evaluating the behaviors in friction and wear of TiAl-based material. Originality/value The findings of this paper provide better assistance to explore the effect of friction layers on the friction and wear behaviors of TiAl-based materials. The results help in deep understanding of the micro-structure evolution of friction layers. It also increases the service life of TiAl-based mechanical components.

scholarly journals Friction and Wear between Polymer and Metal in the Mixing Process

Materials ◽  
2019 ◽  
Vol 12 (24) ◽  
pp. 4029
Author(s):  
Yiren Pan ◽  
Lin Zhu ◽  
Huaqiao Liu ◽  
Meng Zhang ◽  
Wenwen Han ◽  
...  
Keyword(s):  
Service Life ◽  
Physical Properties ◽  
Friction And Wear ◽  
Alloy Coating ◽  
Mixing Process ◽  
Dispersion Process ◽  
Test Part ◽  
Mixing Chamber ◽  
Long Time

In order to obtain a longer mixing chamber life, a layer of hard alloy coating is generally welded on the surface. However, when the mixing chamber is used for a long time, the surface will be worn due to friction with small fillers and rubber. As a result, there will be a large gap between the mixing chamber and the rotor, which will further affect the quality of the mixed rubber. In this paper, the dispersion process of the reinforcing system is simulated at first, and the mixed rubber samples are obtained from different dispersion stages in preparation for experiments with the chamber material. On this basis, the friction experiment is carried out with the same material as the mixing chamber on the friction experiment machine employed in the improved test part. The experiment shows that the friction and wear between the mixture and metal produced in each mixing stage are different. The wear in the stage with high friction is not necessarily large. The wear will be intensified in the middle and later mixing periods, while the friction will tend to be stable. In this paper, besides the exploration on the friction of fillers and rubber on the mixing chamber in different mixing stages, the most important thing is to change the mixing process of rubber formula, so as to extend the service life of the mixing chamber without changing the comprehensive physical properties of the mixing rubber.

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