Finite Element Analysis of Automotive Disk Brake and Pad in Frictional Model Contact

Finite Element Analysis of Automotive Disk Brake and Pad in Frictional Model Contact

Belhocine Ali (Faculty of Mechanical Engineering, University of Sciences and the Technology of Oran, Oran, Algeria)
DOI: 10.4018/IJMMME.2015100103
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The object of this work is to present a study of the thermomechanical behavior of the automobile disc brake during the braking phase. Then, a purely mechanical study of dry contact between the disc and pads is developed with a good prediction becomes a major stake for the industrialists while modeling the loading and the boundary conditions around the disc. The same computer code was used to visualize displacements, total deformations in the disc, shear stresses, Von Mises stresses and, the tools of contact pads. Also studied was the case of thermoelasticity while interpreting the various exits results during this simulation.
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1. Introduction

When two bodies come into contact with friction, there is a dissipation of energy and thus of the heat produced at the level of the contact, which involves a dilation being able to increase the pressure field. This phenomenon increases if the tangential constraints as well as relative sliding speeds between the two bodies are significant. These thermomechanical effects are translated more the share of time by the formation of zones located with very high thermal gradients, the hot points. There is appearance of thermal deformations and the stress concentrations being able to generate cracks, vibrations, etc.

In the aircraft industry and automobile, many parts are subjected simultaneously to thermal and mechanical requests. The thermomechanical requests can cause deformations and same damages, for example, friction in a brake generates heat in the disc which can generate deformations and vibrations.

The work carried out by Akhtar et al. (2013), a finite element method has been employed to explain the transient thermoelastic phenomena of a dry clutch system. The effect of sliding speed on contact pressure distribution, temperature and heat flux generated along the frictional surfaces is analyzed. The clutch system has been simulated by axisymmetric model using ANSYS software.

Sowjanya and Suresh (2013) treated a static structural analysis of the disc brake by using Ansys workbench whose some composite materials were selected to compare the results obtained like the Deflection, Normal Stress, Von Mises stress.

In the research developed by Chengal Reddy et al. (2013), a thermal and structural coupled analysis was carried out to find the strength of the disc brake.

Gnanesh et al. (2014) Investigated thermal-structural analysis of normal and vented disc brake rotor using ANSYS software 13.0 in the case of design no holes and with holes in the rotor. The materials used in the simulation are cast iron, stainless steel and Aluminum metal matrix composites.

Manjunath and Suresh (2013) treated a structural and thermal analysis of the disc brake rotor by using Ansys workbench 14.5 to determine the deformation and the Von Mises stress established in the disc for the both solid and ventilated discs with two different materials to enhance performance of the rotor disc. In the work carried out by Parab et al. (2014), structural and thermal analysis was carried out on the disc brakes using three materials Stainless Steel and Cast iron & carbon carbon composite. Structural analysis is done on the disc brake to validate the strength of the disc brake and thermal analysis is done to analyze the thermal properties.

In the research developed by Tiwari et al.(2014), a transient structural analysis of the rotor disc of disc brake is aimed at investigation in to usage of structural steel materials is required, which improve braking efficiency and provide greater stability to the vehicle. This investigation can be done using ANSYS software 14.0 is a dedicated finite element package used for determining the variation of the stresses and deformation across the disc brake profile.

The aim of this paper was to investigate the thermomechanical field of the disc brake rotor and the pads during the braking phase. With this purely mechanical analysis, we determine the variation of the total deformation of the model disc-pads at the time of braking, the stress distribution of the brake pads. Lastly, the results of the thermoelastic coupling such as Von Mises stress, Contact pressure field and the total deformations of the disc and pads are also presented in this study which will be useful for the design in the industry of automobile.


2. Description Of A Disc

The friction tracks are known as external when they are located on the side of the rim and interior when they are located on the side of the axle.

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