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Reliability Analysis of Overhead Transmission Line Multilayered Stranded Conductor/Clamp Assemblies for Fretting Fatigue Failure.

Record Type:	Electronic resources : Monograph/item
Title/Author:	Reliability Analysis of Overhead Transmission Line Multilayered Stranded Conductor/Clamp Assemblies for Fretting Fatigue Failure./
Author:	Thomas, Oluwafemi Olumide.
Description:	1 online resource (194 pages)
Notes:	Source: Dissertations Abstracts International, Volume: 84-10, Section: A.
Contained By:	Dissertations Abstracts International84-10A.
Subject:	Tribology. -
Online resource:	http://pqdd.sinica.edu.tw/twdaoapp/servlet/advanced?query=30351543click for full text (PQDT)
ISBN:	9798377680338

Reliability Analysis of Overhead Transmission Line Multilayered Stranded Conductor/Clamp Assemblies for Fretting Fatigue Failure.
Thomas, Oluwafemi Olumide.

Reliability Analysis of Overhead Transmission Line Multilayered Stranded Conductor/Clamp Assemblies for Fretting Fatigue Failure. - 1 online resource (194 pages)

Source: Dissertations Abstracts International, Volume: 84-10, Section: A.

Thesis (Ph.D.)--McGill University (Canada), 2022.

Includes bibliographical references

Failure of transmission line overhead conductors due to fretting fatigue has led to an increased research effort in understanding the mechanical behavior of these multi-body structures from an experimental perspective and more recently from a computational perspective. However, research devoted to understanding the structural reliability of overhead conductors undergoing deterioration due to fretting fatigue is limited. The current approach to estimate the reliability of these structures has depended on the performance of expensive experiments on conductor - clamp systems that are then grouped into classes on the basis of the idealized stress method. Reliability estimates are then usually defined for the first wire failure of a conductor or some percentage of wire failures in terms of the number of cycles to failure for a specified idealized stress level. A limitation of this approach is that it is not based on the distribution of stresses at the local contact points responsible for initiating and propagating fretting fatigue cracks. The use of this approach results in large uncertainties on the prediction of conductor fatigue life since it does not account for the characteristics of different conductor/clamp configurations.In this thesis, the sources of variability in overhead conductor fatigue life prediction are first identified. A framework for assessing the reliability of overhead conductors under fretting fatigue conditions is then developed. The framework uses finite elements analyses of single contacts and of the conductor/clamp assembly to determine the state of stress at each wire-wire and wire-clamp/keeper contact. The state of stress at contacts is used to evaluate the fretting fatigue potential and to evaluate the probability of fatigue failure at each contact using single wire plain fatigue data. The Poisson binomial distribution is used to estimate the probability of failure for single and multiple wire failures considering all the contact within the conductor/clamp assembly and to develop fragility curves. The model is validated through comparisons with experimental data. Stress-number of cycle curves for one or more wire failures are presented for overhead conductors. Distribution of the number of wire failures in a conductor are also presented. Unlike the current approach, the framework presented in this thesis does not rely on performing expensive tests on the conductor and provides a means for generating specific conductor-clamp SN curves and safe limits for overhead conductor fatigue assessment and management.

Electronic reproduction.
Ann Arbor, Mich. :
ProQuest,
2023

Mode of access: World Wide Web

ISBN: 9798377680338Subjects--Topical Terms:

626393
Tribology.
Index Terms--Genre/Form:

542853
Electronic books.

Reliability Analysis of Overhead Transmission Line Multilayered Stranded Conductor/Clamp Assemblies for Fretting Fatigue Failure.
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520 $a Failure of transmission line overhead conductors due to fretting fatigue has led to an increased research effort in understanding the mechanical behavior of these multi-body structures from an experimental perspective and more recently from a computational perspective. However, research devoted to understanding the structural reliability of overhead conductors undergoing deterioration due to fretting fatigue is limited. The current approach to estimate the reliability of these structures has depended on the performance of expensive experiments on conductor - clamp systems that are then grouped into classes on the basis of the idealized stress method. Reliability estimates are then usually defined for the first wire failure of a conductor or some percentage of wire failures in terms of the number of cycles to failure for a specified idealized stress level. A limitation of this approach is that it is not based on the distribution of stresses at the local contact points responsible for initiating and propagating fretting fatigue cracks. The use of this approach results in large uncertainties on the prediction of conductor fatigue life since it does not account for the characteristics of different conductor/clamp configurations.In this thesis, the sources of variability in overhead conductor fatigue life prediction are first identified. A framework for assessing the reliability of overhead conductors under fretting fatigue conditions is then developed. The framework uses finite elements analyses of single contacts and of the conductor/clamp assembly to determine the state of stress at each wire-wire and wire-clamp/keeper contact. The state of stress at contacts is used to evaluate the fretting fatigue potential and to evaluate the probability of fatigue failure at each contact using single wire plain fatigue data. The Poisson binomial distribution is used to estimate the probability of failure for single and multiple wire failures considering all the contact within the conductor/clamp assembly and to develop fragility curves. The model is validated through comparisons with experimental data. Stress-number of cycle curves for one or more wire failures are presented for overhead conductors. Distribution of the number of wire failures in a conductor are also presented. Unlike the current approach, the framework presented in this thesis does not rely on performing expensive tests on the conductor and provides a means for generating specific conductor-clamp SN curves and safe limits for overhead conductor fatigue assessment and management.
520 $a La defaillance des conducteurs aeriens des lignes de transport electriques due a la fatigue par frottement est le sujet de plusieurs projets de recherche experimentaux et de modelisation numerique. Par contre, peu de projets de recherche se sont penches sur l'evaluation de la fiabilite mecanique des conducteurs aeriens assujettis a la fatigue par frottement. L'approche actuelle pour estimer la fiabilite des conducteurs se base sur la realisation d'experiences couteuses sur differents assemblages conducteur-pince et le regroupement des resultats sur la base de la methode des contraintes idealisees. Les estimations de fiabilite sont alors generalement definies pour la premiere defaillance d'un fil du conducteur ou un certain pourcentage de fils brises en fonction du nombre de cycles pour un niveau de contrainte idealise specifie. Une limitation de cette approche est qu'elle n'est pas basee sur la distribution des contraintes aux points de contact locaux responsables de l'initiation et de la propagation des fissures de fatigue par frottement. L'utilisation de cette approche engendre plusieurs incertitudes sur la prediction de la duree de vie du conducteur car elle ne tient pas compte des caracteristiques des differentes configurations de conducteur/pince.Dans cette these, les sources de variabilite dans la prediction de la duree de vie en fatigue des conducteurs aeriens sont d'abord identifiees. Une procedure pour l'evaluation de la fiabilite des conducteurs aeriens dans des conditions de fatigue par frottement est ensuite developpee. La procedure se base sur des analyses par elements finis du contact entre deux fils ainsi que des contacts multiples pour un assemblage conducteur/pince. L'etat de contrainte aux contacts est utilise pour evaluer le potentiel de fatigue par frottement et pour evaluer la probabilite de rupture par fatigue a chaque contact a l'aide de donnees de fatigue sur un fil. La distribution binomiale de Poisson est utilisee pour estimer la probabilite de defaillance pour un ou plusieurs fils en tenant compte de tous les contacts dans l'assemblage conducteur/pince et pour developper des courbes de fragilite. Le modele est valide par des comparaisons avec des donnees experimentales. Des relations contrainte-nombre de cycles pour une ou plusieurs defaillances de fil sont egalement derivees a partir du modele. Contrairement a l'approche actuelle, la procedure presentes dans cette these ne depend pas de la realisation de tests couteux sur le conducteur et fournit un moyen de generer des courbes SN specifiques pour un assemblage particulier ainsi que des limites de securite pour l'evaluation et la gestion de la fatigue des conducteurs aeriens.
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