Optimization of Design of Railway Disc Brake Pads

1996 ◽  
Vol 210 (1) ◽  
pp. 51-61 ◽  
Author(s):  
N Benseddiq ◽  
D Weichert ◽  
J Seidermann ◽  
M Minet
Keyword(s):  
Element Model ◽  
Lower Surface ◽  
Disc Brake ◽  
Two Dimensional ◽  
Bearing Surface ◽  
Braking Performance ◽  
Brake Pads ◽  
Disc Brakes ◽  
Dimensional Finite Element

High temperatures are one of the main problems encountered in disc brakes, contributing to rapid wear and poor braking performance. In this paper, a two-dimensional finite element model using a thermomechanical algorithm is used to predict the evolution of the bearing surface and temperature distribution at the interface between the disc and pad. After determination of the temperature of a conventional brake configuration, the behaviour of several modified friction pad designs is simulated numerically in order to improve contact and so to achieve lower surface temperatures.

Prediction of Railway Disc Brake Temperatures Taking the Bearing Surface Variations into Account

1995 ◽  
Vol 209 (2) ◽  
pp. 67-76 ◽  
Author(s):  
P Dufrénoy ◽  
D Weichert
Keyword(s):  
Contact Problem ◽  
Pressure Distribution ◽  
Contact Surface ◽  
Numerical Approach ◽  
Disc Brake ◽  
Experimental Measurements ◽  
Uniform Pressure ◽  
Two Dimensional ◽  
Bearing Surface ◽  
Disc Brakes

For several years, increasing velocities and loads on modern trains have pushed the braking materials more and more to their limits. The temperatures reached by disc brakes are very difficult to predict locally because of the discontinuous contact surface between disc and pads and because of the non-uniform pressure distribution on this surface. This contact problem may also vary rapidly with time during a single braking and from one braking to the next one. The present work proposes a two-dimensional numerical approach calculating the evolution of the bearing surface between disc and pad, with an impact-contact analysis coupled with a thermomechanical resolution. The distribution and the evolution of the temperatures are calculated and compared to experimental measurements. The method can be used to assess the performance of braking systems and gives valuable indications for braking design.

Braking performance of a novel frictional-magnetic compound disc brake for automobiles

2018 ◽  
Vol 233 (10) ◽  
pp. 2443-2454 ◽  
Author(s):  
Yan Yin ◽  
Jiusheng Bao ◽  
Jinge Liu ◽  
Chaoxun Guo ◽  
Tonggang Liu ◽  
...  
Keyword(s):  
Magnetic Field ◽  
Temperature Rise ◽  
Friction Material ◽  
Maximum Temperature ◽  
Interface Temperature ◽  
Disc Brake ◽  
Braking Performance ◽  
Maximum Temperature Rise ◽  
Disc Brakes ◽  
Braking Torque

Disc brakes have been applied in various automobiles widely and their braking performance has vitally important effects on the safe operation of automobiles. Although numerous researches have been conducted to find out the influential law and mechanism of working condition parameters like braking pressure, initial braking speed, and interface temperature on braking performance of disc brakes, the influence of magnetic field is seldom taken into consideration. In this paper, based on the novel automotive frictional-magnetic compound disc brake, the influential law of magnetic field on braking performance was investigated deeply. First, braking simulation tests of disc brakes were carried out, and then dynamic variation laws and mechanisms of braking torque and interface temperature were discussed. Furthermore, some parameters including average braking torque, trend coefficient and fluctuation coefficient of braking torque, average temperature, maximum temperature rise, and the time corresponding to the maximum temperature rise were extracted to characterize the braking performance of disc brakes. Finally, the influential law and mechanism of excitation voltage on braking performance were analyzed through braking simulation tests and surface topography analysis of friction material. It is concluded that the performance of frictional-magnetic compound disc brake is prior to common brake. Magnetic field is greatly beneficial for improving the braking performance of frictional-magnetic compound disc brake.

Étude de la réouverture de la lagune du Havre aux Basques. I. Modélisation numérique des conditions d'écoulement

1995 ◽  
Vol 22 (1) ◽  
pp. 55-71
Author(s):  
Y. Ouellet ◽  
A. Khelifa ◽  
J.-F. Bellemare
Keyword(s):  
Finite Element ◽  
Numerical Study ◽  
Element Model ◽  
Two Dimensional ◽  
Flow Conditions ◽  
Modélisation Numérique ◽  
Tidal Flows ◽  
Dimensional Finite Element ◽  
The Stability ◽  
La Madeleine

A numerical study based on a two-dimensional finite element model has been conducted to analyze flow conditions associated with different possible designs for the reopening of Havre aux Basques lagoon, located in Îles de la Madeleine, in the middle of the Gulf of St. Lawrence. More specifically, the study has been done to better define the depth and geometry of the future channel as well as its orientation with regard to tidal flows within the inlet and the lagoon. Results obtained from the model have been compared and analyzed to put forward some recommendations about choice of a design insuring the stability of the inlet with tidal flows. Key words: numerical model, finite element, lagoon, reopening, Havre aux Basques, Îles de la Madeleine.

Study of Influence of Residual Stresses on Crack Propagation in Particulate Ceramic Composites

2016 ◽  
Vol 258 ◽  
pp. 178-181 ◽  
Author(s):  
Zdeněk Majer ◽  
Luboš Náhlík ◽  
Kateřina Štegnerová ◽  
Pavel Hutař ◽  
Raúl Bermejo
Keyword(s):  
Residual Stresses ◽  
Crack Propagation ◽  
Element Model ◽  
Ceramic Composites ◽  
Particulate Composites ◽  
Micro Cracks ◽  
Dimensional Finite Element ◽  
Density Factor ◽  
Energy Density Factor

The aim of the present work is to analyze the influence of residual stresses in the particulate ceramic composite on the crack propagation. The crack propagation direction was estimated using Sih’s criterion based on the strain energy density factor. A two-dimensional finite element model was developed for determination of crack path. The residual stresses resulting from the mismatch of coefficients of thermal expansion during the fabrication process of the composite were implemented to the computational model. The effect of the particles shape on the crack propagation was investigated. Conclusions of this paper can contribute to a better understanding of the propagation of micro-cracks in particulate composites in the field of residual stresses.

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