Dynamic finite element modeling and fatigue damage analysis of thermite welds

Railway track comprises of continuous welded rail mounted with rail clips on sleepers integrated to a ballast track form system. Modeling the rail structure with thermite weld subjected to the complex dynamic loadings is a challenging problem. Fatigue failures at the head‐to‐web, web‐to‐foot, and fo...

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Published inFatigue & fracture of engineering materials & structures Vol. 43; no. 1; pp. 119 - 136
Main Authors Liu, Z., Shi, X., Tsang, K.S., Hoh, H.J., Pang, J.H.L.
Format Journal Article
LanguageEnglish
Published Oxford Wiley Subscription Services, Inc 01.01.2020
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ISSN8756-758X
1460-2695
DOI10.1111/ffe.13091

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Abstract Railway track comprises of continuous welded rail mounted with rail clips on sleepers integrated to a ballast track form system. Modeling the rail structure with thermite weld subjected to the complex dynamic loadings is a challenging problem. Fatigue failures at the head‐to‐web, web‐to‐foot, and foot regions of weld collar are investigated. In this paper, a combined method of multibody system dynamic analysis and dynamic finite element analysis was used. A train roll‐in experiment was conducted at a train depot test track to validate modeling results predicted at the strain gauge location. Three critical plane‐based multiaxial fatigue criterions incorporated with a smallest enclosing circle algorithm were implemented in Python code to study the fatigue behavior at weld collar. Parametric studies were also conducted to investigate the effects of track component materials, track curvature, and train velocity. This approach provides a method for predicting the failures of thermite welded joints in railway tracks.
AbstractList Railway track comprises of continuous welded rail mounted with rail clips on sleepers integrated to a ballast track form system. Modeling the rail structure with thermite weld subjected to the complex dynamic loadings is a challenging problem. Fatigue failures at the head‐to‐web, web‐to‐foot, and foot regions of weld collar are investigated. In this paper, a combined method of multibody system dynamic analysis and dynamic finite element analysis was used. A train roll‐in experiment was conducted at a train depot test track to validate modeling results predicted at the strain gauge location. Three critical plane‐based multiaxial fatigue criterions incorporated with a smallest enclosing circle algorithm were implemented in Python code to study the fatigue behavior at weld collar. Parametric studies were also conducted to investigate the effects of track component materials, track curvature, and train velocity. This approach provides a method for predicting the failures of thermite welded joints in railway tracks.
Author Tsang, K.S.
Liu, Z.
Pang, J.H.L.
Hoh, H.J.
Shi, X.
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Snippet Railway track comprises of continuous welded rail mounted with rail clips on sleepers integrated to a ballast track form system. Modeling the rail structure...
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SubjectTerms Algorithms
critical plane process
Damage assessment
dynamic modeling approach
Fatigue failure
Finite element method
Mathematical models
Mechanical components
Modelling
multiaxial fatigue
Multibody systems
Railroad ties
Railway tracks
smallest enclosing circle
Strain gauges
Webs
Welded joints
wireless strain measurement
Title Dynamic finite element modeling and fatigue damage analysis of thermite welds
URI https://onlinelibrary.wiley.com/doi/abs/10.1111%2Fffe.13091
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