Pressure distribution at the contact surface in the collision of a deformable cylinder with a rigid obstacle

1992 ◽  
Vol 24 (8) ◽  
pp. 522-525
Author(s):  
Yu. A. Emel'yanov ◽  
A. I. Kozachuk ◽  
A. V. Orlov
Keyword(s):  
Pressure Distribution ◽  
Contact Surface ◽  
Rigid Obstacle ◽  
Deformable Cylinder

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.

A Method for Slip-Stick Area Analysis of Contact Surface in Rotor Blades With Friction Damper

2017 ◽  
Author(s):  
Mao Xinnan ◽  
Wang Yanrong ◽  
Ye Hang
Keyword(s):  
Pressure Distribution ◽  
Contact Surface ◽  
Normal Pressure ◽  
Rotor Blades ◽  
Partial Slip ◽  
Friction Damper ◽  
Contact Center ◽  
Theoretical Derivation ◽  
Contact State ◽  
Shear Traction

High cycle fatigue damage caused by resonance can significantly affect the reliability and life of rotor blades in turbomachinery. Dry friction damper is widely used in vibration reduction design of joint components because of its excellent performance. To predict the vibration response of rotor blades with friction damper, it’s necessary to analyze the pressure distribution of contact area and determine the contact state of each point. Most researchers focused on the construction and improvement of friction models, and assumed that only the normal pressure distribution decides where slip and stick areas are, but the shear traction also play a role. In this paper, a novel method is proposed to quantitatively conduct the slip-stick area analysis of contact surface by means of theoretical derivation and numerical simulation. Both the non-dimensional normal pressure and shear traction distribution are obtained for different contact conditions. It is found that both the normal pressure and shear traction of each point dominate its contact state. Moreover, the area at contact edges always begins slipping firstly, even if the normal pressure there is much larger than contact center. The developed method will also help to establish more accurate partial-slip model for various jointed structures with friction damping.

Life Evaluation of a Disk Brake of Railway Vehicles Considering Pressure Distributions at a Frictional Surface

2007 ◽  
Vol 353-358 ◽  
pp. 303-306 ◽  
Author(s):  
Sung Keun Cho ◽  
Jung Hun Choi ◽  
Young Min Lee ◽  
Chang Sung Seok
Keyword(s):  
Thermal Stress ◽  
Pressure Distribution ◽  
Contact Surface ◽  
3D Model ◽  
Thermal Stresses ◽  
Distribution Analysis ◽  
Disk Brake ◽  
Pressure Distributions ◽  
Life Evaluation ◽  
Stress Analyses

In this study, we performed thermal stress analyses on a ventilated disk brake with a 3D model for two cases (whether the pressure distribution on a contact surface is uniform or not). A pressure distribution analysis was performed to determine the pressure distribution on the contact surface. Then, by using the results that were obtained from the pressure distribution analyses, we performed thermal stress analyses. Finally, we have found the spots where the maximum thermal stresses occur. Also, for the life evaluation of a disk brake, we have conducted the fatigue test and obtained the S-N curve. From those results, we evaluated the life of a disk brake.

scholarly journals Measurement of Pressure Distribution on Contact Surface by Transferred Oil Film.

1995 ◽  
Vol 61 (3) ◽  
pp. 372-376
Author(s):  
Katsumi YAMAGUCHI ◽  
Motomi UCHIDA
Keyword(s):  
Pressure Distribution ◽  
Contact Surface ◽  
Oil Film

A Method to Measure Contact Pressure Between Metallic Surfaces by Changes in Surface Roughness

1981 ◽  
Vol 103 (2) ◽  
pp. 210-217 ◽  
Author(s):  
S. Kato ◽  
K. Yamaguchi ◽  
T. Kato
Keyword(s):  
Surface Roughness ◽  
Pressure Distribution ◽  
Elasticity Theory ◽  
Contact Surface ◽  
Flat Surface ◽  
Metallic Surfaces ◽  
Interface Pressure ◽  
Roughness Change ◽  
Before And After ◽  
Contact Surfaces

A new method was developed to find the interface pressure distribution of metallic surfaces in contact by measuring the roughness change. The pressure distribution of two kinds of contact surfaces, a sphere and a flat surface, a flat end of a cylinder and a flat surface, was measured experimentally by the method and compared with that of the elasticity theory. As a result, it was shown that it is possible to find the pressure distribution by measuring the roughness change in the contact surface before and after contact.

Effect of Malalignment and Friction on Contact Pressure in the Polyethylene Component in the Total Knee Replacement

2002 ◽  
Author(s):  
Nagarajan Chandran ◽  
F. Amirouche ◽  
Wayne Goldstein ◽  
Riad Barmada
Keyword(s):  
Total Knee Replacement ◽  
Pressure Distribution ◽  
Contact Pressure ◽  
Knee Replacement ◽  
Contact Surface ◽  
Tibial Component ◽  
Loading Condition ◽  
Experimental Results ◽  
Component Rotation ◽  
Total Knee

The articulation of the femoral and tibial component contact surface is influenced by the alignment of these components. Malalignment of the total knee is perceived to increase the contact pressure and reduces the life of the polyethylene component. In this paper the contact pressure obtained from a experimental results [2] are used as the loading condition for a normal TKA alignment. In the case of a malalignment, we assumed that the loads at the interface do not change and the malalignment is to the femur component rotation. The results show that the pressure distribution is higher in the malaligned fit, which implies a reduced lifetime for the TKA. In the analysis, the experimental loads derived from cadaver knee testing are increased by a scale factor of 5, 10, 20, 50 to predict a more realistic loading condition of the knee. The effect of malrotation on the pressure distribution under these condition shows that the percentage change in the pressure distribution is slightly larger than that from the experimental loads.

Wedge and eggbar shoes change the pressure distribution under the hoof of the forelimb in the square standing horse

2003 ◽  
Vol 23 (7) ◽  
pp. 306-309
Author(s):  
Chris W. Rogers ◽  
Willem Back
Keyword(s):  
Pressure Distribution

Unsteady Pressure Distribution of a Flapping Wing Undergoing Root Flapping Motion with Elbow Joint at Different Reduced Frequencies

2017 ◽  
Vol 10 (3) ◽  
pp. 105
Author(s):  
Ahmad F. Razaami ◽  
M. K. H. M. Zorkipli ◽  
H. C. Lai ◽  
M. Z. Abdullah ◽  
Norizham Abdul Razak
Keyword(s):  
Pressure Distribution ◽  
Elbow Joint ◽  
Flapping Wing ◽  
Flapping Motion ◽  
Unsteady Pressure

THEORETICAL CONSIDERATION OF AN OSCILLATING ARC PRESSURE DISTRIBUTION

2006 ◽  
Vol 10 (4) ◽  
pp. 537-548
Author(s):  
T. Yamamoto ◽  
I. Kuno ◽  
Koichi Takeda ◽  
Takehiko Toh ◽  
Jim Tanaka ◽  
...  
Keyword(s):  
Pressure Distribution ◽  
Theoretical Consideration ◽  
Arc Pressure
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