Load Environment of Rail Joint Bars – Phase II, Joint Bar Service Environment and Fatigue Analysis

Akhtar, Muhammad; Koch, Kevin; Wiley, Roy; Davis, David

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Load Environment of Rail Joint Bars – Phase II, Joint Bar Service Environment and Fatigue Analysis

2014-07-01
By Akhtar, Muhammad ; Koch, Kevin ; Wiley, Roy

File Language:

English

Details

Creators:

Akhtar, Muhammad ; Koch, Kevin ; Wiley, Roy ; Davis, David
Corporate Creators:

Transportation Technology Center, Inc.
Corporate Contributors:

United States. Federal Railroad Administration
Subject/TRT Terms:
Publication/ Report Number:

DOT/FRA/ORD-14/22
Resource Type:

Tech Report
Geographical Coverage:

United States
Corporate Publisher:

United States. Federal Railroad Administration. Office of Research and Development
Abstract:

Detailed analysis of measured bending strains shows that the foundation deflections have the most significant effect on the magnitude of strains. All other factors, such as track type, track geometry, and fastening systems, have a less significant effect on strain levels. Fatigue analysis of the current and proposed candidate materials indicate that most joint bars may have a significantly longer fatigue life. The joint bar fatigue failures seen in service are likely from surface material discontinuities created as a result of manufacturing processes and mechanical notches induced during handling. Another factor that potentially affects the fatigue life is deteriorated foundations under rail joints. Significant residual stresses exist in as-manufactured joint bars. These stresses may affect the joint bar failures in negative or positive ways depending on the nature of service-induced stresses at a particular location. Instead of increasing the size of joint bars, managing residual stress appears to be an economical option to increase the strength of joint bars.
Format:

PDF
Download URL:

https://rosap.ntl.bts.gov/view/dot/28269/dot_28269_DS1.pdf
File Type:

[PDF - 2.91 MB]
Collection(s):

US Transportation Collection ; Federal Railroad Administration
Main Document Checksum:

urn:sha256:4a05b3ae5412e42e18929184afdc05acd66e6e806ab11c071cd66c6b3bc93209

File Language:

English

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