Produção Nacional
Revisado por pares
Patric Daniel Neis, Ney Francisco Ferreira, Flávio José Lorini,
The current research intends to make a laboratory-scale tribometer to perform high temperature tests (fading). Results from a full-scale brake dynamometer, which were run according to the AK Master standard procedure, are used as a reference. Firstly, operating parameters from both laboratory-scale and full-scale machine have been adjusted according to the theory of scale. Secondly, a good correlation between the thermal results from both machines has been aimed. For doing that, various factors have ...
Tópico(s): Gear and Bearing Dynamics Analysis
2011 - Elsevier BV | Wear
Produção Nacional
Revisado por pares
Patric Daniel Neis, Patrick De Baets, Wouter Ost, Yeczain Pérez Delgado, Mia Loccufier, Farid Al‐Bender, Ney Francisco Ferreira, Flávio José Lorini,
In this paper, the friction stability of brake materials is investigated by means of a rotating stick–slip tester. Experimental results are compared with a computational model implemented in Simulink. The main goal of this work is to find out how vibrations induced by friction are related to mechanical system parameters such as inertia (mass), stiffness, damping and sliding speed. At the same time, a computational model is developed in order to analyse the dynamic response of a dry friction process ...
Tópico(s): Vehicle Dynamics and Control Systems
2011 - Elsevier BV | Wear
Produção Nacional
Revisado por pares
Patric Daniel Neis, Ney Francisco Ferreira, Fábio Pinto da Silva,
Three different techniques for measuring wear in brake pads are compared: a gravimetric method (electronic balance), a linear measuring touch probe method, and a three-dimensional laser scanning method. Laboratory-scale wear tests were performed on two different types of brake friction materials: a semi-metallic (SM) and a non-asbestos organic (NAO). All three techniques were able to show clear differences in the wear rates of the materials selected for study. It was observed that choosing only a few ...
Tópico(s): Railway Engineering and Dynamics
2014 - Elsevier BV | Wear
Produção Nacional
Revisado por pares
Carlos Edmundo de Abreu e Lima Ipar, Rodrigo Lebrón, André J. Souza, Ney Francisco Ferreira, Patric Daniel Neis,
Tópico(s): Tunneling and Rock Mechanics
2015 - Springer Science+Business Media | The International Journal of Advanced Manufacturing Technology
Produção Nacional
Patric Daniel Neis, Ney Francisco Ferreira, Jacob Sukumaran, Patrick De Baets, Mátyás Andó, Luciano Tedesco Matozo, Diego Masotti,
The present work presents the morphology evolution of a brake material surface submitted to braking tests through a laboratory-scale tribometer. Optical microscope images of the material’s surface were obtained for every 10 braking operations. These images were post-processed in appropriate computational software. By means of the image segmentation technique, morphological parameters related to the brake material surface were estimated. The wear rate and also the coefficient of friction resulting ...
Tópico(s): Aerodynamics and Fluid Dynamics Research
2015 - Ghent University | International Journal Sustainable Construction & Design
Produção Nacional
Revisado por pares
Patric Daniel Neis, Ney Francisco Ferreira, Gusztáv Fekete, Luciano Tedesco Matozo, Diego Masotti,
Tópico(s): Tribology and Wear Analysis
2016 - Elsevier BV | Tribology International
Produção Nacional
Revisado por pares
Patric Daniel Neis, Ney Francisco Ferreira, Jean Carlos Poletto, Luciano Tedesco Matozo, Diego Masotti,
This paper describes the development of a methodology for assessing and correlating stick–slip and brake creep groan. For doing that, results of tribotests are compared to data obtained in vehicle tests. A low velocity and a linear reduction in normal force were set for the tribotests. The vehicle tests consisted of subjecting a sport utility vehicle to three different ramp slopes. Creep groan events were measured by accelerometers placed on the brake calipers. The root mean square of the acceleration ...
Tópico(s): Railway Engineering and Dynamics
2016 - Elsevier BV | Journal of Sound and Vibration
Produção Nacional
Revisado por pares
L.Y. Barros, Patric Daniel Neis, Ney Francisco Ferreira, Rafael Paini Pavlak, Diego Masotti, Luciano Tedesco Matozo, Jacob Sukumaran, Patrick De Baets, Mátyás Andó,
A method has been developed for quantifying the percentage of friction layer coverage on a brake disc surface. The method is used to examine the relationship of layer coverage to the coefficient of friction and the morphology of the contact plateaus existing on the brake pad surface. Two kinds of brake pads, a non asbestos organic (NAO) and a semi-metallic (SM), were subjected to sliding against a gray cast iron disc in a laboratory-scaled tribometer. In order to observe the effect caused by the contact ...
Tópico(s): Vibration Control and Rheological Fluids
2016 - Elsevier BV | Wear
Produção Nacional
Revisado por pares
Patric Daniel Neis, Ney Francisco Ferreira, Jean Carlos Poletto, Jacob Sukumaran, Mátyás Andó, Yuhang Zhang,
The present research article addresses an investigation of tribological properties of 3 commercially available cast polyamide 6 (PA 6): a natural PA 6 polymer, a PA 6 filled with molybdenum disulfide (MoS2), and a PA 6 filled with a special solid lubricant. In order to analyze the potential use of these materials in industrial applications, their tribological results were compared with those measured for a commercial bronze alloy. All materials (including the bronze alloy) were subjected to sliding ...
Tópico(s): Lubricants and Their Additives
2017 - Elsevier BV | Wear
Produção Nacional
Revisado por pares
Jean Carlos Poletto, L.Y. Barros, Patric Daniel Neis, Ney Francisco Ferreira,
The present paper provides a statistical analysis of the error obtained in the measurement of density (Dcp), size (Scp) and area fraction (Acp) of the contact plateaus existing on the surface of brake friction materials (BFM). Two different analysis were performed: (1) random: micrographs were taken in random locations of the BFMs' surfaces; (2) deterministic: micrographs were taken in 3 arrangements, that are border (B), center (C) and distributed (D). Results of the random analysis revealed that a micrograph ...
Tópico(s): Adhesion, Friction, and Surface Interactions
2018 - Elsevier BV | Tribology International
Produção Nacional
Revisado por pares
Gustavo da Silva Gehlen, Patric Daniel Neis, L.Y. Barros, Jean Carlos Poletto, Maurício Ebeling, Ney Francisco Ferreira, Sandro Campos Amico, Clarissa Coussirat Angrizani,
Abstract The present study addresses the tribological behavior of polyester composites reinforced with a natural fiber (sisal), a synthetic fiber (glass) and their combination (glass/sisal hybrid). The composites were obtained by compression molding with an overall fiber content of 20 or 40 vol%. The composites were rubbed against a steel counterface using a tribometer. Pure sisal composite exhibited superior wear resistance, mainly due to the formation of a concise tribofilm. It also showed the lowest ...
Tópico(s): Tribology and Wear Analysis
2019 - Wiley | Polymer Composites
Produção Nacional
Revisado por pares
L.Y. Barros, Jean Carlos Poletto, Patric Daniel Neis, Ney Francisco Ferreira, Carlos Henrique Selle Pereira,
Previous studies have shown that the copper originated from the wear of automotive brake friction materials (BFM) is one of the main sources of the deposit of this metal in rivers and lakes, leading to environmental impacts. As a result, recent US legislations have forced a drastic reduction of the copper used in BFM’s in the next years, which will be likely followed by other governments around the world. Although the copper is widely used in BFM’s, the understanding of the action mechanisms of this ...
Tópico(s): Railway Engineering and Dynamics
2019 - Elsevier BV | Wear
Produção Nacional
Revisado por pares
Gustavo da Silva Gehlen, Patric Daniel Neis, L.Y. Barros, Jean Carlos Poletto, Ney Francisco Ferreira, Sandro Campos Amico,
The present paper addresses the tribological behaviour of new eco-friendly brake friction materials with rice husk (RH). Three formulations with different RH content (0%, 6% and 12%) were developed and subjected to the SAE J2522 test procedure, plus an extra high-temperature section, through a laboratory-scaled braking tribometer. At 300 °C, RH acted holding wear debris and improving wear resistance due to the formation of large contact plateaus. At 550 °C, RH's organic compounds degraded, leading to ...
Tópico(s): Lubricants and Their Additives
2022 - Elsevier BV | Wear
Produção Nacional
Revisado por pares
Ana Paula Gomes Nogueira, Gustavo da Silva Gehlen, Patric Daniel Neis, Ney Francisco Ferreira, Stefano Gialanella, Giovanni Straffelini,
The addition of the rice husk in a new eco-friendly Cu-free brake pad formulation was investigated in this study. Rice husk (RH) is a natural agro-waste residue with relatively high silica content, which should display abrasive properties that are not easily found in other natural materials. In this study, tribological properties of three friction materials were investigated using a pin-on-disc (PoD) tribometer. The three formulations were prepared adding to a common composition, each one of the following ...
Tópico(s): Tribology and Wear Analysis
2022 - Elsevier BV | Wear
Produção Nacional
Revisado por pares
Gustavo da Silva Gehlen, Ana Paula Gomes Nogueira, Davide Carlevaris, L.Y. Barros, Jean Carlos Poletto, Germano Lasch, Giovanni Straffelini, Ney Francisco Ferreira, Patric Daniel Neis,
The tribological behavior of new green friction materials with rice husk (RH) and rice husk ash (RHA) is discussed in the current paper. Two formulations developed, one with 6% RH and one with 6% RHA, were compared with a reference formulation with alumina under the AK Master test, through a braking tribometer. Formulation with RHA showed tribological performance equal to or better than the reference material, especially in high temperature applications where the RHA particles assisted in the building ...
Tópico(s): Vehicle Dynamics and Control Systems
2022 - Elsevier BV | Wear
Produção Nacional
Revisado por pares
Jean Carlos Poletto, Patric Daniel Neis, Ney Francisco Ferreira, Diego Masotti, Luciano Tedesco Matozo,
The present paper analyzed 6 brake noise indexes (or Squeal Indexes) in order to assess the squeal produced by 4 different pad materials, which were subjected to dynamometer tests in accordance with SAE J2521 test procedure. Regardless the rating system used in the analysis, the same ranking was obtained with respect to the amount of noise produced by the brake pads selected in this study. Results from the noisiest to the quietest friction material were: pad 1 (semi-metallic) > pad 4 (low-metallic) > pad ...
Tópico(s): Acoustic Wave Phenomena Research
2017 - Elsevier BV | Applied Acoustics
Produção Nacional
Revisado por pares
L.Y. Barros, Jean Carlos Poletto, Diogo Buneder, Patric Daniel Neis, Ney Francisco Ferreira, Rafael Paini Pavlak, Luciano Tedesco Matozo,
The transition in wear regime is a tribological phenomenon observed in many materials, where a sudden change in wear regime (from moderate to severe) occurs when operating parameters (e.g. pressure or sliding velocity) are changed. However, this phenomenon is rarely explored in brake friction materials (BFMs). Severe wear regime for BFMs results in an increase in cost and leads to environmental issues due to the high amount of loss in material. This work aims to study the transition in BFM applying ...
Tópico(s): Railway Engineering and Dynamics
2019 - Elsevier BV | Wear
Produção Nacional
Diego Masotti, Patric Daniel Neis, Ney Francisco Ferreira, Kássio Gomes, Jean Carlos Poletto, Luciano Tedesco Matozo,
Tópico(s): Gear and Bearing Dynamics Analysis
2015 - | SAE technical papers on CD-ROM/SAE technical paper series
Produção Nacional
Revisado por pares
Tej Singh, Gustavo da Silva Gehlen, Vedant Singh, Ney Francisco Ferreira, L.Y. Barros, Germano Lasch, Jean Carlos Poletto, Sharafat Ali, Patric Daniel Neis,
The aim of this study is to develop a method for selecting and ranking automotive brake friction composite materials made from agro-waste and natural fibers. This is achieved by using an integrated multi-criteria decision-making methodology. Consequently, six composite samples are produced by reinforcing rice husk, rice husk ash, and Grewia optiva fiber. These samples are then assessed for their frictional properties using a laboratory-scale brake tribometer, in accordance with the requirements ...
Tópico(s): Vehicle Dynamics and Control Systems
2024 - Elsevier BV | Results in Engineering
Produção Nacional
Revisado por pares
L.Y. Barros, Jean Carlos Poletto, Gustavo da Silva Gehlen, Germano Lasch, Patric Daniel Neis, A. Ramalho, Ney Francisco Ferreira,
This article aims to describe the sequence of events (cause-effect) that lead to the transition in wear regime from moderate to severe for brake friction materials (BFM). Tribofilm, contact plateaus and wear debris are characterized in both regimes through different techniques. It was concluded that there is a critical tensile strength which leads to the destruction of the contact plateaus (the secondary type), resulting in a direct contact between the metallic fibers of the BFM and the tribofilm deposited ...
Tópico(s): Railway Engineering and Dynamics
2023 - Elsevier BV | Tribology International
Produção Nacional
Revisado por pares
L.Y. Barros, Jean Carlos Poletto, Diogo Buneder, Roberto Flores, Gustavo da Silva Gehlen, Patric Daniel Neis, Ney Francisco Ferreira, Luciano Tedesco Matozo,
Abstract Brake friction materials (BFMs) are designed to have low wear rate under different conditions of contact pressure, temperature, and sliding velocity. The conditions to ensure a low wear rate (i.e., a moderate wear regime) between the disc and the BFM are not well established. The present article aims to enhance the comprehension about the wear regimes for BFMs. For this purpose, a commercial BFM was slid against a gray cast iron rotor (disc). Tests were performed under different sliding velocities ...
Tópico(s): Railway Engineering and Dynamics
2021 - Wiley | Polymer Composites
Produção Nacional
Mauricio Blanco Infantini, Eduardo André Perondi, Ney Francisco Ferreira,
Tópico(s): Hydraulic and Pneumatic Systems
2005 - | SAE technical papers on CD-ROM/SAE technical paper series
Produção Nacional
Revisado por pares
Tej Singh, Gustavo da Silva Gehlen, Ney Francisco Ferreira, L.Y. Barros, Germano Lasch, Jean Carlos Poletto, Sharafat Ali, Patric Daniel Neis,
There have been growing concerns over using non-renewable resources while manufacturing goods and related environmental laws worldwide. As part of efforts to reduce dependence on non-renewable resources, the uses of natural resources in brake friction materials are gaining prominence. Therefore, a natural fiber from the Himalayan region, Grewia Optiva, was used in the present study to develop a sustainable material for automotive braking applications. Brake friction composite materials were manufactured ...
Tópico(s): Tribology and Wear Analysis
2023 - Elsevier BV | Journal of Materials Research and Technology
Produção Nacional
Revisado por pares
Gustavo da Silva Gehlen, Patric Daniel Neis, Jean Carlos Poletto, L.Y. Barros, Diogo Buneder, Ney Francisco Ferreira,
The present study examined the effect of temperature on Pressure-Velocity Limit (PVL) of a commercial polyacetal (POM-C) with carbon black.The polymer was rubbed against a gray cast iron counterpart (disc) through a pin-on-disc tribometer.The operating parameters of the wear tests included a fixed constant load, 3 different temperatures (30, 55 and 85 • C), and sliding velocities (v) varying from 1.2 to 2.0 m/s.At 30 • C, the PVL was 2.04 MPa m s -1 (at 1.8 m/s).At 55 • C, two distinct PVLs were identified: ...
Tópico(s): Natural Fiber Reinforced Composites
2020 - Elsevier BV | Wear
Produção Nacional
Diego Masotti, Ney Francisco Ferreira, Patric Daniel Neis, Ademir Reus Menetrier, Luciano Tedesco Matozo, Paulo Emilio Dias Varante,
Tópico(s): Powder Metallurgy Techniques and Materials
2014 - | SAE technical papers on CD-ROM/SAE technical paper series
Produção Nacional
Patric Daniel Neis, Ney Francisco Ferreira, Luciano Tedesco Matoso, Diego Masotti, Jean Carlos Poletto,
Tópico(s): Railway Engineering and Dynamics
2015 - | SAE technical papers on CD-ROM/SAE technical paper series
T. Premkumar, I. Siva, Patric Daniel Neis, Sandro Campos Amico, Ney Francisco Ferreira, J.T. Winowlin Jappes,
Tópico(s): Polymer Nanocomposites and Properties
2019 - IOP Publishing | Materials Research Express
Produção Nacional
Patric Daniel Neis, Ney Francisco Ferreira, Jean Carlos Poletto,
The current paper addresses a comparative analysis of performance (friction and wear) and acoustic characteristics of an original and 3 aftermarket brake pads. All brake pads selected in this study belong to the same vehicle and they were purchased at the local market in Brazil. The braking tests were performed on a laboratory-scaled tribometer, which is located on the University facilities. Five parameters were used to characterize the brake pads: (1) average magnitude of friction; (2) friction variation; ( ...
Tópico(s): Vehicle Dynamics and Control Systems
2015 - Springer Science+Business Media | Journal of the Brazilian Society of Mechanical Sciences and Engineering
Produção Nacional
Revisado por pares
Carlos Edmundo de Abreu e Lima Ipar, Patric Daniel Neis, Ney Francisco Ferreira, Daniel Juchem Heck, Thomas Felipe Zibetti,
Tópico(s): Laser Material Processing Techniques
2020 - Springer Science+Business Media | The International Journal of Advanced Manufacturing Technology
Produção Nacional
Diego Severo Antunes, Diego Masotti, Ney Francisco Ferreira, Patric Daniel Neis, Letícia Fleck Fadel Miguel, Juliana Favero,
Tópico(s): Acoustic Wave Phenomena Research
2022 - Springer Science+Business Media | Journal of the Brazilian Society of Mechanical Sciences and Engineering