Papers by Keyword: Wear

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Authors: Xin Cao, Han Pan, Hong Wang
Abstract: "HaiYangShiYou 115" chain cable in use process was found in more broken wires. Through the chemical composition analysis, mechanical property testing, fracture analysis, metallographic examination methods, the cause of the broken wire are analyzed. The results show that: the material of steel cable anchor chain mechanical performance is basic comply with the design requirements, the broken wire fracture is relatively serious wear, all send the samples of the present wear trace shape is consistent, should be the same kind of wear the way by damage, and reduced the steel wire tensile strength, lead to fracture .
Authors: Bong Jae Choi, Kyung Eui Hong, Jeong Il Youn, Young Jig Kim
Abstract: The main purpose of this research is to evaluate the wear resistance of titanium matrix composites (TMCs). Reinforcements, TiB and TiC, were formed by in-situ reaction between boron carbide and commercial pure titanium. The confirmation of the sound synthesis of TMCs was done by phase identification. And then, sliding wear test were carried out to verify the wear resistance of TMCs by means of the coefficient of friction, wear loss and morphology wear track. The results of wear test indicate that TMCs have superior resistance than AISI H13 tool steel at the condition of severe loads.
Authors: Hironobu Oonishi, N. Murata, M. Saito, S. Wakitani, K. Imoto, S. Kin, Y. Chen, H. Nakaya, M. Tanaka, H. Amino
Authors: Piotr Szota, Sebastian Mróz, Henryk Dyja, Anna Kawałek
Abstract: Numerical modelling of the round bar rolling process, while considering the wear of the passes depending on their shape, was carried out within the present work. For the theoretical study of the rolling process, the Forge2008® was employed, which is finite element method-relying software that enables the thermomechanical simulation of rolling processes in a triaxial strain state. The wear model implemented in the Forge2008® permits no quantitative evaluation, but only comparative analysis of the wear of rolls. In order to use the results of simulation employing the simplified Archard model for the quantitative evaluation of roll wear, it is necessary to define the wear factor and hardness of the tool as a function of temperature. The paper present a methodology for the determination of the quantitative wear of rolls based on the results of computer simulations performed using the Forge2008® software for a selected round pass during rolling of round bars.
Authors: Jian Ping Zhang, Yan Kun Jiang, Xin Liu, Zhe Lin Dong
Abstract: Aiming at a large marine diesel engine, a mathematical model for the 3-D elastohydrodynamic lubrication analysis of piston ring-cylinder liner was presented. The average Reynolds equation and asperity contact approach were combined with the elastic deformation equation. The asymmetry in the circumferential direction, gas blowby and the effect of temperature and pressure on the oil density and viscosity were considered. The 3-D wear simulation of piston ring-cylinder liner was performed when the diesel engine was operated under warm start and cold start conditions, respectively. The 3-D distribution rules show that the first gas ring has the biggest wear loss, and the maximum wear loss of cylinder liner occurs in the vicinity of TDCF. Finally, the results matched well with the wear measurements, and it indicates the present method is effective and can help engineers to improve the tribological performance of the diesel engine.
Authors: José García, Thais Carvalho Miranda, Haroldo Cavalcanti Pinto, Flavio Soldera, Frank Mücklich
Abstract: In this work 3D visualization of wear in milling inserts has been investigated by Focused Ion Beam tomography. It has been observed that the morphology of the cracks differs in the z-axis direction, allowing particular characteristics of the microstructure and wear evolution to be visible. Two types of cracks develop: principal and lateral cracks. The formation of lateral cracks is strongly influenced by the degradation of the binder phase in the regions surrounding the principal crack. The lateral cracks and the deflection of the main cracks present a particular semi-elliptical geometry, which correlates with the stress field originated during the input of a cycling load in a fatigue condition.
Authors: Yu Bai, Fang Li Yu, Jun Du, Wen Xian Wang, Ze Qin Cui, Zhi Hai Han, Jian Feng Yang
Abstract: Due to the low density and high specific strength, magnesium and its alloys have been extensively used in the automobile and aerospace applications, where the weight reduction is critical. However, they are highly prone to corrosion, which has greatly limited their application in the automotive and aerospace industries. This paper briefly reviews the technologies for improving the corrosion and wear resistance of magnesium alloys and finds that the widespread application of magnesium alloys is still limited by the lack of proper protective coatings. Therefore, there is still a need to explore new materials and methods for the effective protection of magnesium and its alloys.
Authors: Ana García, Laura Ferreiro, Angel Varela, José Luís Mier, Carolina Camba, Fernando Barbadillo
Abstract: Wear is one of the most worrying problems in industry; it affects many production sectors. Therefore, the wear resistance of materials must be assessed in order to predict their response and anticipate possible failures. Maintenance could then be scheduled accordingly. Due to the large number of situations where wear is important, one of the main complications in tribology is that it is difficult to replicate in a laboratory the precise conditions of service. Thus, there is a need to choose between different kinds of tests to simulate actual conditions. However, this aim is difficult to achieve, as variables and conditions of service are numerous. In this situation, it is neither practical nor possible to have as many test devices in the laboratory as real possibilities. It is necessary to find a test that can be extrapolated to many possible situations. An important question is if the results obtained with different configurations simulated in the laboratory are good equivalents or, on the contrary, the choice of method has an influence and to what extent the latter case is true. In addition, it should be noted that wear test standards mention how difficult it is to reproduce results and how they are influenced by operating conditions In this paper, three wear tests methods are studied- the pin-on-disk, dry sand/rubber wheel test and wet sand/rubber wheel- in order to find a relationship between the results obtained by them. Furthermore, different techniques are analysed to establish, if possible, which ones are more likely to achieve more reliable results.
Authors: Yu Chi Lin, Han Ming Chen, Yong Chwang Chen
Abstract: This work focused on the wear performance of the clad layers which were formed with cladding titanium nitrides (TiN) powder on the JIS SKD11 tool steel by the gas tungsten arc welding (GTAW) method. A rotating type tribometer was used to evaluate the wear behavior of the clad specimens under different sliding conditions. Furthermore, a nanoindenter was used to measure the hardness and elastic modulus of the reinforcements. According to the wear test results, the wear performance of the specimens cladded with TiN powder was better than that of the JIS SKD11 tool steel specimens. During dry sliding wear test, the clad layers exhibited a strong wear resistance because they contained the hard TiN reinforcements. Therefore, the wear performance of the clad layers was substantially better than that of the SKD11 specimens under all the test conditions in this study. In addition, produced oxide films might influence the wear behavior of different specimens during the wear testing, and oxidation wear would even dominate the wear behavior of the clad layers under some conditions.
Authors: K. Rajkumar, Saigopal Vasudevan, N. Subbiah
Abstract: The wearing of bush made of brass in various applications is a cause for major concern. This study aims to analysing the various causes, mechanisms, environmental effects that influence the wearing and reduction in efficiency of the brass-steel sliding pair. The anti-friction and anti-wear properties are analysed under various conditions using a multitude of approaches. The particulate size of the dispersed lubricant (graphite and nanographite) and the temperature under which the experiment is being conducted is directly responsible for the sliding and wear properties of the brass specimen. The current studies and observations involved the use of a pin on disc apparatus, where the test specimen as the pin and slid against the steel plate (EN-31) at various speeds, loads, levels of lubrication and temperatures. The depth of wear under the different loading and sliding speeds are determined individually by means of an LVDT measurement.
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