Banca de DEFESA: Thamise Sampaio Vasconcelos Vilela

Uma banca de DEFESA de DOUTORADO foi cadastrada pelo programa.
STUDENT : Thamise Sampaio Vasconcelos Vilela
DATE: 11/03/2024
TIME: 14:30
LOCAL: Microsoft TEAMS
TITLE:

Integrated Analysis of the Fatigue Behavior of Overhead Conductors: Development of a Master Curve for Fatigue Life Estimation

KEY WORDS:

Master Curve, Conductor Fatigue, Estimated Life, Mean Stress, Overhead Conductor, S-N Curve

PAGES: 117
BIG AREA: Engenharias
AREA: Engenharia Mecânica
SUMMARY:

When installing overhead conductors on transmission lines, it is necessary to apply a static stretching load to protect the conductor against harmful wind vibrations, maintaining a line clearance in accordance with the power line design. The parameters that control this stretching load are the Everyday Stress (EDS) and the H/w parameter. They have been proposed as a means of power lines designing safe from fatigue due to Aeolian vibration. The greater the stretching stress, the more the conductor becomes vulnerable to wind vibration, as its self-damping capacity is reduced and the mean stress increases, which can cause premature failure. However, the study of the effect of mean stress on the fatigue life of conductors is a gap in the literature, as it is not as widely studied with regard to modeling the EDS (or H/w) effect on conductors. The diversity of conductor types (shape, materials and arrangement) is one of the main reasons for this gap. Therefore, this work aims to develop a master curve that allows predicting the fatigue life of any conductor under the effects of average voltage, using the models: Goodman,Gerber, Soderberg,Smith-Watson-Topper e Walker. To this end, the SWT and Walker approaches were used with results from fatigue tests from different stretching load values to create the master curves and validate the application of such criteria to the fatigue life of different conductors’ families and, thus, evaluate the effect of mean stress on life in fatigue. This master curve is a practical and simple tool that provides fatigue life prediction at a high level (three times the useful life) to variety of conductors at low cost. Thus, the power line transmission community could choose a more conservative curve.

COMMITTEE MEMBERS:
Interno - 1523261 - COSME ROBERTO MOREIRA DA SILVA
Interno - 1646090 - FABIO COMES DE CASTRO
Externo à Instituição - JEFERSON APARECIDO MORETO - USP
Presidente - 1249764 - JORGE LUIZ DE ALMEIDA FERREIRA
Externo à Instituição - RAPHAEL ARAÚJO CARDOSO - UFRN