Coupling Analysis of Frictional Heat under Control of Disc Brake Anti-Skid Brake System

2011 ◽  
Vol 199-200 ◽  
pp. 721-728
Author(s):  
Yi Bing Zhang ◽  
Ying Ying Zhang
Keyword(s):  
Thermal Stress ◽  
Friction Pair ◽  
Brake System ◽  
Frictional Heat ◽  
Brake Disc ◽  
Analysis Model ◽  
Element Analysis ◽  
Study Results ◽  
Friction Temperature ◽  
Braking Force

The nonlinearity of material properties at different temperatures and the manner of braking force applying on a brake system are two key factors to affect the coupling of temperature and thermal stress. Considering these two factors, a finite element analysis model of automobile brake disc and pad is established. By using the model, the dynamic frictional heat and thermal stress of braking friction pair could be simulated and the coupling characters of temperature and thermal stress on friction surfaces could be studied, where the braking force is constant or controlled by an anti-skid brake system(ABS). The study results shown that the friction temperature of brake disk rises in periodic and fluctuant tendency. The fluctuant increase of temperature will influence the character of braking. The increase of friction temperature between a brake disc and pad can decrease under the control of ABS, so the effect of thermo-mechanical coupling could be reduced.

Investigation of Friction Temperature in Railway Disc Brake

2012 ◽  
Vol 479-481 ◽  
pp. 202-206
Author(s):  
Wan Hua Nong ◽  
Fei Gao ◽  
Rong Fu ◽  
Xiao Ming Han
Keyword(s):  
Finite Element ◽  
Contact Pressure ◽  
Friction Pair ◽  
Brake Disc ◽  
Finite Element Software ◽  
Disc Surface ◽  
Friction Temperature ◽  
Steel Disc ◽  
Braking Force ◽  
Braking Process

The distribution of temperature on the rubbing surface is an important factor influencing the lifetime of a brake disc. With a copper-base sintered brake pad and a forge steel disc, up-to-brake experiments have been conducted on a full-scale test bench at a highest speed of 200 Km/h and a maximum braking force of 22.5 KN. The temperature distributions on brake disc surface have been acquired by an infrared thermal camera, and the contact pressure on the contact surface of the friction pair has been calculated by the finite element software ABAQUS. The results show that the area and thermal gradient of the hot bands increase with the increase of braking speed and braking force. The hot bands occur in priority at the radial location of r=200 mm and r=300 mm, and move radially in the braking process. The finite element modelling calculation indicates that the distribution of the contact pressure on the disc surface in radial direction is in a "U"-shape. The maximum contact pressure occur at the radial locations of r=200 mm and r=300 mm, and the minimum contact pressure occur in the vicinity of the mean radius of the disc. The conformity of contact pressure distributions with the practical temperature evolutions indicates that the non-uniform distribution of the contact pressure is the factor resulting in the appearance of hot bands on the disc surface.

Analysis of Temperature Field and Thermal Deformation for Lubricating Oil Transfer Pump

2012 ◽  
Vol 268-270 ◽  
pp. 1067-1070
Author(s):  
Jian Ning Xu ◽  
Wen Jie Lv ◽  
Bin Zhu ◽  
Duan Yin Zhu ◽  
Yan Xiong Gao
Keyword(s):  
Temperature Field ◽  
Thermal Deformation ◽  
Friction Pair ◽  
Lubricating Oil ◽  
Deformation Analysis ◽  
Analysis Model ◽  
Element Analysis ◽  
Screw Pump ◽  
Pump System ◽  
Twin Screw

Lubricating oil transfer pump is an important function subsystem in twin-screw pump system. The friction pair between Lubrication screw and shell also is heat source of the system, not only affect the temperature field of the subsystem and the whole system, and the excessive thermal deformation itself may exist can also cause drive failure. This paper established the temperature field and thermal deformation analysis model and boundary conditions of the lubrication screw by means of Finite Element Analysis, and analyzed temperature field and thermal deformation of the lubrication screw and shell as the coefficient of convective heat transfer is 1200W/m2∙°C in the oil production process, and proved thermal deformation of the lubrication screw and shell can not affect the normal work of Lubricating oil transfer pump in the condition.

Modeling of thermal contact problem of disc brake system with frictional heat generation

2014 ◽  
Vol 11 (4) ◽  
pp. 373-390 ◽  
Author(s):  
A. Belhocine ◽  
M. Bouchetara ◽  
Ar. Bakar ◽  
M. Nouby
Keyword(s):  
Temperature Distribution ◽  
Thermal Contact ◽  
Frictional Heat ◽  
Brake Disc ◽  
Heat Flux Distribution ◽  
Element Analysis ◽  
Critical System ◽  
Suspension Systems ◽  
The Finite Element Analysis ◽  
Air Bag

Safety aspect in automotive engineering has been considered as a number one priority in development of new vehicle. Each single system has been studied and developed in order to meet safety requirement. Instead of having air bag, good suspension systems, good handling and safe cornering, there is one most critical system in the vehicle which is brake systems. The objective of this work is to investigate and analyze the temperature distribution of rotor disc during braking operation using ANSYS Multiphysics. The work uses the finite element analysis techniques to predict the temperature distribution on the full and ventilated brake disc and to identify the critical temperature of the rotor. The analysis also gives us, the heat flux distribution for the two discs.

Effect of Water Pipe Cooling on Thermal Stress of FuYang River Aqueduct Structure

2013 ◽  
Vol 438-439 ◽  
pp. 569-572
Author(s):  
Xin Li Bai ◽  
Jiang Yan Li ◽  
Qian Pan
Keyword(s):  
Temperature Field ◽  
Thermal Stress ◽  
Simulation Method ◽  
Water Pipe ◽  
Analysis Model ◽  
Element Analysis ◽  
Crack Location ◽  
Cooling Pipe ◽  
Calculation Results ◽  
Water Pipe Cooling

In order to analyze the influence rule of water pipe cooling on the temperature field and thermal stress of large aqueduct structure, the finite element analysis model for FuYang River Aqueduct structure was established. The temperature field and thermal stress of the aqueduct structure were calculated. The following two cases were considered: structure with or without water pipe cooling, as well as the different beginning pouring months (May, June and July). The hydration-degree-based calculation methods of temperature and stress of concrete were adopted, and the high precision discrete simulation method of water pipe was used. The calculation results show that embedding the cooling pipe in concrete can effectively reduce the temperature difference between inside and outside of the early concrete and thermal stress, and is therefore effective to prevent concrete cracks. High accuracy of simulation and analysis can make people basically figure out the specific mechanism of concrete cracking and main factors even before construction, and determine accurately the structure crack location and the developing tendency.

Numerical Analysis of Thermoelastic Instability in Disc Brake System

2011 ◽  
Vol 110-116 ◽  
pp. 2780-2785 ◽  
Author(s):  
Sung Pil Jung ◽  
Hyun Seok Song ◽  
Tae Won Park ◽  
Won Sun Chung
Keyword(s):  
Three Dimensional ◽  
Mechanical Analysis ◽  
Brake System ◽  
Thickness Variation ◽  
Disc Brake ◽  
Friction Contact ◽  
Analysis Model ◽  
Element Analysis ◽  
Thermoelastic Instability ◽  
Analysis Technique

Thermal energy generated by the friction between the disc and pad is transferred to both components and causes thermal expansion of material of each component, and futher affects the friction contact condition. This is the main factor of the thermoelastic instability (TEI) of a disc brake. In this study, TEI is analyzed using the finite element analysis technique. Three dimensional thermo-mechanical analysis model of the disc brake system is created. An intermediate processor based on the staggered approach is used to exchange analysis results: temperature, friction contact power, nodal displacement and deformation. Disc thickness variation (DTV) and temperature distribution of the disc are calculated, and the tendency and meaning of the results are discussed.

Finite Element Analysis of Fiber-Reinforced Iron-Boron Alloy

2011 ◽  
Vol 383-390 ◽  
pp. 7413-7417
Author(s):  
Yun Zhang ◽  
Wei Yang ◽  
Jian Jun Wu
Keyword(s):  
Finite Element Analysis ◽  
Finite Element ◽  
Tensile Strength ◽  
Thermal Stress ◽  
Fiber Reinforced ◽  
Analysis Model ◽  
Element Analysis ◽  
Finite Element Analysis Model ◽  
Fiber Properties ◽  
The Finite Element Analysis

The Finite element analysis model of fiber-reinforced iron-boron alloy was established in this article. Effects of the fiber properties on residual thermal stress and tensile strength of the composites were calculated. Composites with different fibers were calculated and comparatively studied.

Research on Circumferential Thermal Stress Field of Coke Drum Using ANSYS

2011 ◽  
Vol 71-78 ◽  
pp. 1217-1220
Author(s):  
Rui Tao Zhu
Keyword(s):  
Thermal Stress ◽  
Stress Field ◽  
Temperature Difference ◽  
Analysis Model ◽  
Element Analysis ◽  
Finite Element Analysis Model ◽  
Indirect Coupling ◽  
Thermal Stress Field ◽  
Calculation Results ◽  
The Impact

The paper takes a realistic coke drum as an example. A finite element analysis model using ANSYS is made, acquired with indirect coupling method, and circumferential thermal stress field of coke drum is calculated. Especially, the boundary conditions are based on the measured data of the realistic coke drum. Then circumferential thermal stress field of coke drum is calculated. The calculation results indicate that the circumferential temperature difference with the same height has little impact to stress of the drum and the circumferential temperature difference has the most important effect on coke drum skirt, so the impact to circumferential cracking of the skirt weld cannot be neglected.

Numerical simulation of ultrasonic spot welding of superelastic NiTi alloys: Temperature distribution and deformation behavior

2022 ◽  
pp. 1-30
Author(s):  
Yuxin Wang ◽  
Sansan Ao ◽  
Wei Zhang ◽  
Anqi Wang ◽  
Mingpeng Cheng ◽  
...  
Keyword(s):  
Thermal Stress ◽  
Stress Distribution ◽  
Spot Welding ◽  
Welding Process ◽  
Temperature History ◽  
Niti Shape Memory Alloy ◽  
Analysis Model ◽  
Element Analysis ◽  
Simulation Results ◽  
Cu Interlayer

Abstract Ultrasonic spot welding (USW) has attracted increasing attention due to its high- throughput solid-state bonding mechanism, which shows great potential in the semiconductor and automotive industry for the joining of metal sheets. However, the short welding cycle makes it challenging to effectively monitor the temperature history and deformation of the workpieces during the USW process, especially for the materials with some special properties. In this study, a three-dimensional (3D) finite element analysis model for USW of superelastic NiTi shape memory alloy (SMA) with Cu interlayer was developed using ANSYS Workbench. The thermal-stress coupled phenomena including the heat generation and stress distribution during the welding process was simulated and analyzed. Firstly, the superelastic constitutive model of NiTi SMAs was constructed. The distribution of temperature and stress field was then obtained by thermal-stress analysis using the direct coupling method, and the superelasticity of SMAs was observed. The simulation results showed that the highest temperature occurred in the center of the welding area during USW, which is proportional to the welding time and inversely proportional to the clamping pressure. In addition, the maximum stress occurred at the center of the contact surface between upper NiTi and Cu interlayer. After that, the validity of the simulation results was verified by setting up a thermocouple temperature measurement platform to collect the temperature data, which exhibited a good agreement with the simulated results. The simulation procedure demonstrates its potential to predict temperature and stress distribution during USW process.

scholarly journals Thermo-Mechanical Coupling Analyses for Al Alloy Brake Discs with Al2O3-SiC(3D)/Al Alloy Composite Wear-Resisting Surface Layer for High-Speed Trains

Materials ◽  
2019 ◽  
Vol 12 (19) ◽  
pp. 3155
Author(s):  
Lan Jiang ◽  
Yanli Jiang ◽  
Liang Yu ◽  
Hongliang Yang ◽  
Zishen Li ◽  
...  
Keyword(s):  
Surface Layer ◽  
Thermal Stress ◽  
Transient Temperature ◽  
Al Alloy ◽  
Brake Disc ◽  
Air Cooling ◽  
Alloy Composite ◽  
Maximum Friction ◽  
Brake Discs ◽  
Friction Temperature

In the present work, a theoretical model of three-dimensional (3D) transient temperature field for Al alloy brake discs with Al2O3-SiC(3D)/Al alloy wear-resisting surface layer was established. 3D transient thermo-stress coupling finite element (FE) and computational fluid dynamic (CFD) models of the brake discs was presented. The variation regularities of transient temperature and internal temperature gradient of the brake discs under different emergency braking conditions were obtained. The effects of initial braking velocity (IBV) and thickness of Al2O3-SiC(3D)/Al alloy composite wear-resisting layer on the maximum friction temperature evolution of the disc were discussed. The results indicated the lower temperature and thermal stress distributed uniformly on the wear-resisting surface, which was dominated by high conductivity and cooling ability of the Al alloy brake disc. The maximum friction temperature was not obviously affected by the thickness of the wear-resisting layer. The maximum friction temperature of the brake discs increased with the increase of the IBV, the maximum friction temperature and thermal stress of the brake discs is about 517 °C and 192 MPa at IBV = 97 m/s considering air cooling, respectively. The lower thermal stress and fewer thermal cracks are produced during the braking process, which relatively decrease the damage. The friction behavior of the tribo-couple predicted using FE method correlated well with the experimental results obtained by sub-scale testing.

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