scholarly journals Fuzzy Fatigue Failure Model to Estimate the Reliability of Extend the Service Life of Rolling Stock

2017 ◽  
Vol 14 (01) ◽  
pp. 01-07
Author(s):  
Dr. Waail Mahmod Lafta
Keyword(s):  
Service Life ◽  
Fatigue Failure ◽  
Rolling Stock ◽  
Failure Model

Fatigue Failure Model for Composite Laminates under Multi-Axial Cyclic Loading

2000 ◽  
Vol 183-187 ◽  
pp. 945-950 ◽  
Author(s):  
Chong Soo Lee ◽  
W. Hwang ◽  
Hyun Chul Park ◽  
Kyung Seop Han
Keyword(s):  
Cyclic Loading ◽  
Fatigue Failure ◽  
Composite Laminates ◽  
Failure Model ◽  
Axial Cyclic Loading

Fatigue behaviour of Vossloh SKL14 tension clamps

2021 ◽  
Author(s):  
Bohumil Culek ◽  
Eva Schmidová ◽  
Petr Tomek ◽  
Petr Vnenk ◽  
Marek Pětioký
Keyword(s):  
Service Life ◽  
Fatigue Failure ◽  
Critical Points ◽  
Fatigue Curve ◽  
Fatigue Behaviour ◽  
Fractographic Analysis ◽  
Railway Track ◽  
Strain Gauges ◽  
Dynamically Loaded ◽  
Fatigue Failures

<p>The reliability of the railway superstructure depends, among other things, on the actual fastening of the rail to the sleepers. This structure is extremely dynamically loaded. In the paper, the attention is paid to the flexible Vossloh W14 fastening system with the use of SKL14 tension clamps. These clamps are often damaged by fatigue failures, especially in curves of small radii (R &lt; 400 m). Within the research, fracture areas were identified and a fractographic analysis was performed. The analysis proved fatigue failure and, therefore, an estimation of the service life of the clamps was made. The evaluation was focused on a selected area of railway track where the fatigue-damaged clamps were found. The strain gauges were placed directly on the clamps at critical points and the obtained values were confronted with the experimentally obtained fatigue curve. Based on the presented findings, the service life of the clamps in the selected track was identified.</p>

FATIGUE FAILURE OF FIBROUS COMPOSITE BASED ON MULTISCALE APPROACH

2021 ◽  
Author(s):  
LAUREN KADLEC ◽  
CASSANDRA HALLER ◽  
YOUNG KWON ◽  
SOO-JEONG PARK ◽  
YUN-HAE KIM
Keyword(s):  
Fatigue Failure ◽  
Fibrous Composite ◽  
Fatigue Tests ◽  
Multiscale Approach ◽  
Failure Model ◽  
Successful Completion ◽  
Constituent Material ◽  
Material Behaviors ◽  
Fatigue Data ◽  
Strength And Stiffness

A framework was presented for a fatigue failure model of fibrous composites using a multiscale approach, which uses the fatigue data of the fiber and matrix materials, respectively. Using this model, fatigue failure of fibrous composite materials and structures can be predicted from the constituent material behaviors. To that end, fiber bundles were tested under cyclic loading to determine their residual strength and stiffness. A successful completion of the model is expected to replace many fatigue tests as the configuration of the fibrous composite is varied.

One of possible approaches to estimating the service life of a wheel set axle of high-speed rolling stock

2021 ◽  
Author(s):  
G. M. Volokhov ◽  
A. A. Lunin ◽  
D. A. Knyazev ◽  
V. V. Chunin ◽  
M. V. Timakov
Keyword(s):  
Service Life ◽  
High Speed ◽  
Rolling Stock

STUDY OF RESIDUAL RESOURCE AND ESTABLISHMENT OF THE LIMIT LIFE OF NON-PURCHASER PASSENGER CARS OF CONSTRUCTION OF KVZ

2020 ◽  
pp. 54-62
Author(s):  
N. Radkevich ◽  
S. Sapronova ◽  
V. Tkachenko
Keyword(s):  
Service Life ◽  
Residual Life ◽  
Rolling Stock ◽  
Technical Diagnostics ◽  
Passenger Cars ◽  
Load Bearing ◽  
Metal Structures ◽  
Passenger Traffic ◽  
Long Operation ◽  
Theoretical Results

In order to ensure the uninterrupted performance of passenger traffic, the task of ensuring the operation of rolling stock outside the extended service life, including passenger cars for the carriage of passengers, remains relevant. Based on this, there is a need for comprehensive research aimed at substantiating the possibility of ensuring operation while maintaining dynamic and strength characteristics. The article examines the residual life of load-bearing metal structures of passenger cars based on the results of technical diagnostics and standard tests. It is concluded that the condition of the load-bearing metal structures of passenger cars built by the Kryukiv Carriage Plant (KСP) after long operation does not approach the limit. The obtained practical and theoretical results make it possible to extend the service life of passenger cars for the construction of KCP beyond the factory set by 41 years.

scholarly journals Modeling the mechanical wear of the contact elements of pantograph during high-speed movement

2020 ◽  
Vol 157 ◽  
pp. 01022
Author(s):  
Victor Philippov ◽  
Alexandr Smerdin
Keyword(s):  
Service Life ◽  
High Speed ◽  
Theoretical Calculations ◽  
Experimental Studies ◽  
Maximum Error ◽  
Life Assessment ◽  
Rolling Stock ◽  
Mechanical Wear ◽  
Wear Process ◽  
Mechanical Component

The use of contact elements with an extended service life is one of the most economical and least costly ways to ensure reliable, economical and environmentally friendly transmission of electricity to rolling stock. To evaluate the service life in OSTU, a methodology for conducting experimental studies of contact pairs of pantograph has been developed and successfully tested, involving bench tests for each pair of contact materials “contact insert - contact wire” in order to determine their optimal combination to reduce wear and increase service life. Assessment of the amount of wear and prediction of the life of the contact elements are made, including using mathematical modeling. The purpose of this article is to improve the mechanical component of the wear model of the contact elements of pantograph in high-speed conditions. The results of experimental studies and theoretical calculations of the mechanical wear of contact elements are presented. The analysis of the graphs allows us to conclude that it is possible to use an improved mathematical model for modeling the mechanical component of the wear process of the elements of contact pairs with a maximum error value of not more than 5%.

POINTWORK SERVICE LIFE EXTENSION BY MEANS OF UNEVEN STIFFNESS OF TURNOUT CURVE RAILS LINE

2017 ◽  
pp. 7-14
Author(s):  
Ludmila Blazhko ◽  
Vladislav Zakharov ◽  
Yevgeniy Chernyayev ◽  
Yevgeniy Shekhtman
Keyword(s):  
Service Life ◽  
Computational Methods ◽  
Practical Importance ◽  
Side Impact ◽  
Life Extension ◽  
Rolling Stock ◽  
Study Results ◽  
Service Life Extension ◽  
Train Speed ◽  
Side Track

Objective: To reduce side wear of rail elements of side track backing-up rail. Methods: Comparative and computational methods were applied in the study. Results: It was detected that in order to extend the pointwork turnout curve service life, it is necessary to reduce the side impact on an outer rail by using rail pads of diverse elasticity. Practical importance: Application of rail pads of diverse elasticity under the outer and inner rails of a pointwork turnout curve makes it possible to increase the speed of rolling stock movement on the side direction of pointwork and increase the life of a pointwork turnout curve with fixed train speed.

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