Wear and Contact Temperature Evolution in Pin-on-Disc Tribotesting of Low-Metallic Friction Material Sliding Against Pearlitic Cast Iron

Straffelini, Giovanni; Verlinski, S. V.; Verma, Piyush; Valota, Giorgio; Gialanella, Stefano

doi:10.1007/s11249-016-0684-9

Cited by 47 publications

(42 citation statements)

References 29 publications

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“…The solid model is based on the SOLID90 elements, while the contact is described by the TARGE174 and CONTA170 surface elements. As known from the literature [34,36], the Fourier number (F 0 ) is used to determine the mesh quality.…”

Section: Fe Modellingmentioning

confidence: 99%

“…Another strategy for calculating T s involves the finite element (FE) modelling, a very powerful method in different fields, including thermal analysis [29,[33][34][35][36], computing capacity and time. A critical aspect in modelling is the selection of the correct contact configuration [30,32].…”

Section: Introductionmentioning

confidence: 99%

“…A critical aspect in modelling is the selection of the correct contact configuration [30,32]. In a previous investigation [34], it was demonstrated that the perfect contact model, assuming that the surface temperatures of the contacting bodies are the same, is to be preferred if compared with the other two models: the imperfect contact approach and separated bodies approach.…”

Section: Introductionmentioning

confidence: 99%

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Pin-on-Disc Testing of Low-Metallic Friction Material Sliding Against HVOF Coated Cast Iron: Modelling of the Contact Temperature Evolution

2017

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Pin-on-disc (PoD) testing is widely used to investigate the sliding behaviour of materials and relevant wear mechanisms under different tribological conditions. The approach has been also profitably applied to the characterization of materials for brake systems to obtain specific information on the wear mechanisms. In the present study, the transient thermal analysis of a pin made with a friction material dry sliding against HVOF coated and uncoated pearlitic cast iron disc in a PoD apparatus was investigated by means of a finite element analysis together with experimental measurements. The aim of the investigation was to model the surface contact temperature in this sliding system to highlight the role of the different surface conditions, i.e., coated and uncoated, on the evolution of the pin and disc temperatures during sliding. In addition, we propose a simplified analytical equation for estimating the average temperature rise in the contact region during sliding, by extending the Kennedy approach in order to be able to provide a quick evaluation of the contact temperature for this kind of couplings, what is very helpful when characterizing a large number of systems in different contact conditions.

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Section: Fe Modellingmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Pin-on-Disc Testing of Low-Metallic Friction Material Sliding Against HVOF Coated Cast Iron: Modelling of the Contact Temperature Evolution

2017

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“…Referring to the process states of Equation (13), the hub speed of each wheel is updated once its derivative is known from the wheel dynamics of Equation (15). The process parameters, , and , are the wheel radius, the wheel inertia and the vehicle mass, respectively.…”

Section: Wheel Torque Observermentioning

confidence: 99%

“…ω i is known from the wheel dynamics of Equation (15). The process parameters, R ω , I ω and m v , are the wheel radius, the wheel inertia and the vehicle mass, respectively.…”

Section: Simulationmentioning

confidence: 99%

Survey on Modelling and Techniques for Friction Estimation in Automotive Brakes

et al. 2017

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Abstract:The increased use of disc brakes in passenger cars has led the research world to focus on the prediction of brake performance and wear under different working conditions. A proper model of the brake linings' coefficient of friction (BLCF) is important to monitor the brake operation and increase the performance of control systems such as ABS, TC and ESP by supplying an accurate estimate of the brake torque. The literature of the last decades is replete with semi-empirical and analytical friction models whose derivation comes from significant research that has been conducted into the direction of friction modelling of pin-disc couplings. On the contrary, just a few models have been developed and used for the prediction of the automotive BLCF without obtaining satisfactory results. The present work aims at collecting the current state of art of the estimation techniques for the BLCF, with special attention to the models for automotive brakes. Moreover, the work proposes a classification of the several existing approaches and discusses the relative pro and cons. Finally, based on evidence of the limitations of the model-based approach and the potentialities of the neural networks, the authors propose a new state observer for BLCF estimation as a promising solution among the supporting tools of the control engineering.

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Tribological properties and related effects of compressed, thermally modified and wax-impregnated wood

Waßmann,

Ahmed

2024

Eur. J. Wood Prod.

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This paper develops a process for the preparation of modified wood with low friction and low wear for tribological applications such as self-lubricating bearings. Two types of wood, beech (Fagus sylvatica) and robinia (Robinia pseudoacacia), have been studied and the results compared with naturally lubricated native lignum vitae. The process developed consists of plasticisation followed by compression in a mould, thermal modification and subsequent wax impregnation. Plasticisation was carried out by conditioning the samples to a low equilibrium moisture content of 10%, followed by heating to a sample core temperature of 80 °C. This process protects the internal wood structure from mechanical damage during densification. After plasticisation, the wood was compressed in a press mould. A low springback effect (SBE), resulting in compression of up to 40%, was achieved by unloading the mould without opening it. This step optimises compressive strength and hardness. Subsequent heat treatment reduces thickness swelling by up to 85%. Finally, a wax impregnation was applied to reduce friction. Sliding wear tests on modified beech wood have shown that the lowest wear occurs in the cross-sectional orientation (load perpendicular to the fibre ends; rxt orientation). Sliding friction studies using a steel ball on a ball-on-disc tribometer showed that compressed and thermally modified samples impregnated with rapeseed wax or beeswax exhibited coefficients of friction in a range of 0.08 to 0.09. These values are almost four times lower than those of plain compressed wood and even lower than those of lignum vitae, which was used for plain bearings decades ago. This study clearly demonstrates the high potential of compressed, thermally modified and wax-impregnated wood.

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Wear and Contact Temperature Evolution in Pin-on-Disc Tribotesting of Low-Metallic Friction Material Sliding Against Pearlitic Cast Iron

Cited by 47 publications

References 29 publications

Pin-on-Disc Testing of Low-Metallic Friction Material Sliding Against HVOF Coated Cast Iron: Modelling of the Contact Temperature Evolution

Pin-on-Disc Testing of Low-Metallic Friction Material Sliding Against HVOF Coated Cast Iron: Modelling of the Contact Temperature Evolution

Survey on Modelling and Techniques for Friction Estimation in Automotive Brakes

Tribological properties and related effects of compressed, thermally modified and wax-impregnated wood

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