The Experts below are selected from a list of 318 Experts worldwide ranked by ideXlab platform
Abdel M Wahab - One of the best experts on this subject based on the ideXlab platform.
-
multiscale analysis of the effect of roughness on Fretting Wear
Tribology International, 2017Co-Authors: Kyvia De Fatima Resende Pereira, Abdel M WahabAbstract:Abstract Fretting occurs when two loaded contacting surfaces are exposed to oscillatory relative movement of small amplitude. Depending on conditions such as surface finishing, coefficient of friction, normal load and slip amplitude, Fretting may reduce the service life of a component by Fretting Wear. The effect of surface roughness on the Fretting Wear profile is still uncertain and may be significant. However, most of the finite element (FE) models that are used to predict Fretting Wear do not take it into consideration. In this paper, we propose a multiscale procedure to study roughness effect on Fretting Wear using FE models. In order to do that, we treat the problem in two scales: a) micro scale to analyse the effect of roughness on the contact pressure for frictionless conditions, and b) macro scale to estimate the Wear profile evolution for a cylinder on plane contact configuration.
Minhao Zhu - One of the best experts on this subject based on the ideXlab platform.
-
The effect of oxygen pressure on the Fretting Wear of titanium alloys
International Journal of Modern Physics B, 2020Co-Authors: Xuejiao Wei, Liangliang Sheng, Jinfang Peng, Guoqing Gou, Minhao ZhuAbstract:A systematic experimental investigation was conducted to study the effect of oxygen environment of different pressure on the Fretting Wear behavior of Ti6Al4V titanium alloy. In order to well probe the real tribo-chemical state, in this work, an in-situ X-ray photoelectron spectroscopy (XPS) analysis test developed by a self-designed high precision Fretting Wear tester integrated with an XPS equipment was used. The tribo-oxidation formed at the different oxygen pressure and its effect on the Fretting Wear mechanism and the resulting Fretting Wear volume in the different Fretting run regime were discussed. Results show that the oxygen environment of different pressure has significant influence on the Wear resistance of titanium alloy depending on the Fretting run regime. In the partial slip regime (PSR), different oxygen pressure plays a little influence on Fretting Wear behavior, while a significant influence for the mixed Fretting regime (MFR) and slip regime (SR). The tribo-oxidations produced at the oxygen environment of different pressure for the different Fretting run regimes are found to correlate well with the resulting Fretting Wear mechanism and the Fretting Wear resistance.
-
Dependence of Fretting Wear resistance on microstructural features of alloyed steels
Tribology International, 2019Co-Authors: Xinyue Qiu, Xuejiao Wei, Minhao ZhuAbstract:Abstract Systematic experimental observations concerning the response of microstructural features on Fretting Wear of steel grades were conducted. Five steel grades with different typical microstructural features were selected. The effect of various microstructures on Fretting Wear behaviour and the resulting Wear mechanism were evaluated. Results show that microstructural features play a significant effect on Fretting Wear resistance depending on the applied loads. The DP and Q&P steel having low hardness show comparable or even better Fretting Wear resistance than the FM steel of the highest hardness regardless of loads, which are all better than TWIP and IF steel. The result suggests that the combination of soft ferrite and hard martensite with/without retained austenite having low hardness displays superior Fretting Wear resistance.
-
Fretting Wear behavior of acrylonitrile butadiene rubber nbr for mechanical seal applications
Tribology International, 2016Co-Authors: Mingxue Shen, Xudong Peng, Xiangkai Meng, Jinpeng Zheng, Minhao ZhuAbstract:Abstract The Fretting Wear behavior of acrylonitrile–butadiene rubber (NBR) was studied. The variation of Fretting running behavior, coefficient of friction (COF) and Wear mechanisms as a function of displacement amplitude and load were discussed in detail. Results showed that the sticky layers on the worn surface played an important role in Fretting Wear. Various damage characteristics could be exhibited in different Fretting running regimes, and the Fretting characteristics were strongly dependent on the displacement amplitude. However, the normal load had little effect on the evolution of the Fretting Wear. The results of X-ray photoelectron spectroscopy (XPS) revealed that no thermal degradation occurred in rubber during Fretting tests.
Daniel Nelias - One of the best experts on this subject based on the ideXlab platform.
-
Semi analytical Fretting Wear simulation including Wear debris
Tribology International, 2017Co-Authors: Vamshidhar Done, Murali Krishna R, Thibaut Chaise, Devarayan Kesavan, Daniel NeliasAbstract:Many numerical models are proposed in the literature using finite element and finite discrete element methods to study Fretting Wear, barely including the effect of Wear debris. These models being computationally expensive, simulating large number of Fretting Wear cycles is not practically feasible. A new methodology is proposed which needs only bulk material properties like friction/Wear coefficients and uses semi-analytical methods to simulate Fretting Wear with entrapped debris. In this approach, debris are assumed to be attached to one of the surfaces during the Fretting process. The results obtained from this approach were compared with Fretting experiments. The proposed method permits to capture the Wear depth and scar width, and results are very close to that observed in the experiments.
Andrea Mura - One of the best experts on this subject based on the ideXlab platform.
-
Characterization of Fretting Wear experiments on spline couplings by principal component analysis
Proceedings of the Institution of Mechanical Engineers Part J: Journal of Engineering Tribology, 2016Co-Authors: Waqar Ahmed Qureshi, Francesca Curà, Andrea MuraAbstract:Fretting Wear is a quasi-static process in which repeated relative surface movement of components results in Wear and fatigue. Fretting Wear is quite significant in the case of spline couplings which are frequently used in the aircraft industry to transfer torque and power. Fretting Wear depends on materials, pressure distribution, torque, rotational speeds, lubrication, surface finish, misalignment between spline shafts, etc. The presence of so many factors makes it difficult to conduct experiments for better models of Fretting Wear and it is the case whenever a mathematical model is sought from experimental data which is prone to noisy measurements, outliers and redundant variables. This work develops a principal component analysis based method, using a criterion which is insensitive to outliers, to realize a better design and interpret experiments on Fretting Wear. The proposed method can be extended to other cases too.
-
Principal Component Analysis for Characterization of Fretting Wear Experiments on Spline Couplings
Procedia Engineering, 2015Co-Authors: Waqar Qureshi, Francesca Curà, Andrea MuraAbstract:Spline couplings are often used in aerospace industry for the purpose of power and torque transfer. A spline coupling typically consists of a hub and shaft with internal and external teeth respectively. As the teeth are engaged and the spline coupling is put into operation, repeated relative surface movement of teeth begins and results in Fretting Wear. Principal component analysis (PCA) is a statistical technique to identify the important parameters and their relationships with each other. This work deals with the characterization of Fretting Wear by the help of principal component analysis. PCA has been applied to the experimental data obtained from Fretting Wear tests in the lab and important variables with respect to Fretting Wear identified. This serves as a new tool to interpret the experimental results and hypothesis generation in the field of Fretting Wear.
Kyvia De Fatima Resende Pereira - One of the best experts on this subject based on the ideXlab platform.
-
multiscale analysis of the effect of roughness on Fretting Wear
Tribology International, 2017Co-Authors: Kyvia De Fatima Resende Pereira, Abdel M WahabAbstract:Abstract Fretting occurs when two loaded contacting surfaces are exposed to oscillatory relative movement of small amplitude. Depending on conditions such as surface finishing, coefficient of friction, normal load and slip amplitude, Fretting may reduce the service life of a component by Fretting Wear. The effect of surface roughness on the Fretting Wear profile is still uncertain and may be significant. However, most of the finite element (FE) models that are used to predict Fretting Wear do not take it into consideration. In this paper, we propose a multiscale procedure to study roughness effect on Fretting Wear using FE models. In order to do that, we treat the problem in two scales: a) micro scale to analyse the effect of roughness on the contact pressure for frictionless conditions, and b) macro scale to estimate the Wear profile evolution for a cylinder on plane contact configuration.
-
MULTISCALE MODELLING OF ROUGHNESS EFFECT IN Fretting Wear
2015Co-Authors: Kyvia De Fatima Resende Pereira, Tongyan Yue, Magd Abdel WahabAbstract:This paper is a literature review of multiscale techniques and their possible applications to Fretting Wear simulations. Firstly, a brief introduction on Fretting phenomenon is given, followed by an overview of the recent FEM modelling techniques used in Fretting Wear. The surface roughness effects is neglected on the majority of the FEM Fretting Wear models, mainly because modelling all the small geometrical details of the surface is very computationally demanding. Therefore, the use of methodologies that could provide information about these small-scale features to the macro-scale model is of great interest. Multiscale techniques (hierarchical, semi-concurrent and concurrent), discussed in this paper, may be a viable option. More specifically, the use of hierarchical homogenization techniques to contact problems and a possible application in Fretting Wear are discussed in detail.
