On an Approach to Prediction of Contact Loading of Rail for Two-Point Contact Between Wheel and Rail

1993 ◽  
pp. 215-224 ◽  
Author(s):  
J. Piotrowski
Keyword(s):  
Point Contact ◽  
Contact Loading

Repeated point contact loading on Ce-TZP

Wear ◽  
1993 ◽  
Vol 170 (2) ◽  
pp. 247-253 ◽  
Author(s):  
Marie-Odile Guillou ◽  
John Leslie Henshall ◽  
Robert Maurice Hooper
Keyword(s):  
Point Contact ◽  
Contact Loading

scholarly journals Stress Analysis of Multilayered Coatings Subjected to Surface Point Contact Loading Based on Its Three-Dimensional Elastic Field Solution

Coatings ◽  
2020 ◽  
Vol 10 (9) ◽  
pp. 838
Author(s):  
Tingjian Wang ◽  
Yue Wu ◽  
Zhihui Qi ◽  
Yang Zhao ◽  
Jingjing Zhang ◽  
...  
Keyword(s):  
Friction Coefficient ◽  
Three Dimensional ◽  
Point Contact ◽  
Elastic Field ◽  
Surface Point ◽  
Contact Loading ◽  
Multilayered Coatings ◽  
Field Solution ◽  
Structural Layout ◽  
Present Solution

In order to investigate the effect of the structural layout of multilayered coatings on its mechanical behavior, a three-dimensional elastic field solution is developed for multilayered solids subjected to surface point contact loading, which is converted from the elastic field solution in frequency domain by using a numerical conversion algorithm. The elastic field solution in frequency domain is obtained by numerically solving a group of linear equations involving the unknown constants in the general elastic field solution of layered material that is obtained by using Fourier integral transform technique. The present solution is validated by comparing with the exact analytical solution for uncoated solids and finite element solution for solids coated with 30 layers. Lastly, the effect of structural layout of multilayered coatings is further investigated with present solution. The result shows that the gradient structural layout with elasticity modulus decreasing gradually from the top layer to the substrate, which is preferable to a larger friction coefficient for multilayered solids subjected to surface line contact loading, is preferable for a smaller friction coefficient <0.1 for multilayered solids subjected to surface point contact loading, and the gradient structural layout with elasticity modulus increasing first in the top layers and then decreasing in the bottom layers, which is preferable to a smaller friction coefficient for multilayered solids subjected to surface line contact loading, is preferable for a friction coefficient >0.2.

scholarly journals Track loading on Russian Railways under modern maintenance conditions

2019 ◽  
Vol 135 ◽  
pp. 02002
Author(s):  
Victor Kochergin ◽  
Igor Maksimov ◽  
Victor Pevzner ◽  
Evgeniya Polunina
Keyword(s):  
Point Contact ◽  
Field Tests ◽  
Test Methods ◽  
Test Method ◽  
Rolling Stock ◽  
Bench Test ◽  
Contact Loading ◽  
Static Tests ◽  
Bench Tests ◽  
Wide Range

Rail fasteners loading and its influence on the track deformability under modern maintenance conditions with increased cars axle loads is observed. The difference between oneand two-point wheelrail contact loading scheme is shown. The authors present the analysis of domestic and foreign methods of pads bench tests and show the necessity of carrying out tests imitating real (two-point contact) loading of pads. The bench test method for researching fastener loading and pad strain characteristics in a wide range of vertical and lateral loads under two-point contact scheme based on a number of field tests is presented. The results of static tests and following dynamic ones with cycling loading, which were carried out on a two-sleepers bench, are observed. Bench tests carried out by VNIIZHT and the analysis of the cyclic test methods showed the importance of fasteners tests with a real loading simulation making it possible to explain the causes of track gauge widening and decrease of track inclination, which considerably influences track stability and wear of the track and rolling stock.

Optimal Design of Layered Structures Under Normal (Frictionless) Contact Loading

2002 ◽  
Vol 124 (3) ◽  
pp. 438-442 ◽  
Author(s):  
Timothy C. Ovaert ◽  
Jihui Pan
Keyword(s):  
Finite Element ◽  
Point Contact ◽  
Optimization Methods ◽  
Layered Structures ◽  
Fe Model ◽  
Contact Loading ◽  
Design Variables ◽  
Conventional Optimization ◽  
Commercial Solver ◽  
Tribological Contact

A methodology is presented for the optimization of a tribological contact configuration, namely, a multi-layered elastic structure under normal (frictionless) point contact loading. This work is aimed at developing an algorithm by which the finite element (FE) mesh and the corresponding structure may be generated automatically for each variation in the vector of design variables during optimization iterations. The FE model for contact analysis may be developed in a given commercial solver such as ABAQUS or ANSYS. To do this, a flexible mesh generator, which interfaces with the FE model and the optimizer, was developed. The optimization scheme is implemented using a simulated annealing (SA) algorithm as the optimizer, with an axisymmetric (point contact) FE indentation model in the commercial finite element solver ABAQUS. The results suggest that conventional optimization methods may be employed to examine the design of tribological contact configurations such as multi-layered structures, working seamlessly within the operating system shell (e.g., Unix), and the finite element solver.

Point-contact spectroscopy of quasi-1D conductors with CDW

1999 ◽  
Vol 09 (PR10) ◽  
pp. Pr10-179-Pr10-181
Author(s):  
A. A. Sinchenko ◽  
Yu. I. Latyshev ◽  
S. G. Zybtsev ◽  
I. G. Gorllova
Keyword(s):  
Point Contact ◽  
Point Contact Spectroscopy

Split beam method for determining mode shapes of cantilever beams under multiple loading conditions

2021 ◽  
pp. 107754632110276
Author(s):  
Jun-Jie Li ◽  
Shuo-Feng Chiu ◽  
Sheng D Chao
Keyword(s):  
Operation Mode ◽  
Point Contact ◽  
Mode Shapes ◽  
Cantilever Beams ◽  
Loading Conditions ◽  
Mechanical Responses ◽  
Relative Contribution ◽  
Resonance Frequencies ◽  
Beam Method ◽  
Multiple Loading

We have developed a general method, dubbed the split beam method, to solve Euler–Bernoulli equations for cantilever beams under multiple loading conditions. This kind of problem is, in general, a difficult inhomogeneous eigenvalue problem. The new idea is to split the original beam into two (or more) effective beams, each of which corresponds to one specific load and bears its own Young’s modulus. The mode shape of the original beam can be obtained by linearly superposing those of the effective beams. We apply the split beam method to simulating mechanical responses of an atomic force microscope probe in the “dynamical” operation mode, under which there are a stabilizing force at the positioner and a point-contact force at the tip. Compared with traditional analytical or numerical methods, the split beam method uses only a few number of basis functions from each effective beam, so a very fast convergence rate is observed in solving both the resonance frequencies and the mode shapes at the same time. Moreover, by examining the superposition coefficients, the split beam method provides a physical insight into the relative contribution of an individual load on the beam.

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