Effect of Track Parameters on Rail Joint Bar Stresses and Crack Growth

Akhtar, Muhammad; Davis, David; Maal, Luis; Gordon, Jeff; Jeong, David Y.; Transportation Technology Center, Inc.; United States. Federal Railroad Administration; John A. Volpe National Transportation Systems Center (U.S.)

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Effect of Track Parameters on Rail Joint Bar Stresses and Crack Growth

2011-02-03
By Akhtar, Muhammad ; Davis, David ; Maal, Luis ; ...

[PDF-1.11 MB]

English

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Creators:

Akhtar, Muhammad ; Davis, David ; Maal, Luis ; Gordon, Jeff ; Jeong, David Y.

Akhtar, Muhammad ; Davis, David ; Maal, Luis ; Gordon, Jeff ; Jeong, David Y. Less -
Corporate Creators:

Transportation Technology Center, Inc. ; United States. Federal Railroad Administration ; John A. Volpe National Transportation Systems Center (U.S.)

Transportation Technology Center, Inc. ; United States. Federal Railroad Administration ; John A. Volpe National Transportation Systems Center (U.S.) Less -
Corporate Contributors:

United States. Federal Railroad Administration. Office of Research, Development, and Technology
Subject/TRT Terms:

[+]

American Railway Engineering And Maintenance-of-Way Association AREMA Bending Stress Continuous Welded Rail Crack Growth Failure Freight Trains Freight Transportation Jointed Track Load Factor Rail Joints Rail Joint Stress Railroad Engineering Railroad Track Parameters Railroad Tracks Research Hub Residual Stress Stress Cracking Thermal Stresses Track Components
Resource Type:

Tech Report
Geographical Coverage:

United States
Corporate Publisher:

John A. Volpe National Transportation Systems Center (U.S.)
Abstract:

By their very nature, rail joints create discontinuities in the running surface of the rails. In addition to bending, thermal, and residual stresses, rail joints are also subjected to dynamic loads due to these discontinuities. Under normal track and load conditions, joint bars fail due to high cycle fatigue, which is evident from fatigue striations observed on broken bars. Accelerated track degradation increases deflections, which further increase joint bar stresses, possibly changing the failure from high cycle fatigue to low cycle fatigue and in some cases even yielding. The current joint bar design is meant to support only the railhead and base. This feature is of limited value in continuous welded rail (CWR) where resistance to longitudinal force loads is also desired. Rail joint bar failures are a safety and reliability concern for railroads. Because of their redundancy (i.e. two bars in each joint), a failed joint bar is almost always found and replaced before an accident occurs. Rail joints are typically not one of the five leading track causes of accidents in the FRA accident database. However, the industry is experiencing some joint caused accidents.
Format:

PDF
Collection(s):

Federal Railroad Administration US Transportation Collection Volpe Center
Main Document Checksum:

[+]

urn:sha256:e95498dc7d5e0a171a0c4ee4a2843262a68f279127f514db64a82b4df682c650
Download URL:

https://rosap.ntl.bts.gov/view/dot/36486/dot_36486_DS1.pdf
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Effect of Track Parameters on Rail Joint Bar Stresses and Crack Growth

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