Fatigue of two contacting wires of the ACSR Ibis 397.5 MCM conductor: Experiments and life prediction

Rocha, P.H.C.; Díaz, J.; Silva, Cosme Roberto Moreira; Araújo, J.A.; Castro, F.C.

doi:10.1016/j.ijfatigue.2019.05.033

Cited by 32 publications

(13 citation statements)

References 24 publications

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“…The same value was used in recent research works which deal with fretting fatigue tests on individual wires. 11,12 In the present study, this parameter was fixed depending on the studied alternating stress amplitudes, which are far from the endurance limit of the tested wire.…”

Section: Preliminary Fretting Fatigue Testsmentioning

confidence: 99%

Fretting fatigue life assessment of overhead conductors using a clamp/conductor numerical model and biaxial fretting fatigue tests on individual wires

Omrani

Langlois

Dyke

et al. 2021

Fatigue Fract Eng Mat Struct

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The fatigue life of overhead conductors is usually evaluated through experimental tests on clamp/conductor assemblies. Some recent studies aim to estimate the fatigue life of conductors using uniaxial tests on individual strands. This paper presents an innovative method for assessing the fretting fatigue life of overhead conductors combining the effect of both tension and bending loadings. It consists of coupling a numerical approach based on modeling the clamp/conductor assembly using the finite element method and an experimental one based on fretting fatigue tests on individual wires. A biaxial fretting fatigue test rig has been developed and validated through preliminary tests performed on 1350-H19 aluminum wires under uniaxial and an equivalent biaxial loading. Tension and bending loadings obtained from the numerical model were then applied on individual wires. Results showed a good correspondence with existing experimental data of the fatigue tests carried on the aluminum conductor steel reinforced (ACSR) Bersfort conductor with a metal-to-metal suspension clamp.

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Section: Preliminary Fretting Fatigue Testsmentioning

confidence: 99%

Fretting fatigue life assessment of overhead conductors using a clamp/conductor numerical model and biaxial fretting fatigue tests on individual wires

Omrani

Langlois

Dyke

et al. 2021

Fatigue Fract Eng Mat Struct

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“…Os ensaios de fadiga por fretting foram realizados com uma máquina de ensaios servo hidráulica (MTS), com célula de carga de 5 kN, acoplado a um dispositivo pneumático de simulação de fretting que foi idealizado e criado por membros do GFFM, como é possível observar na publicação recente de GARCIA et al (2019) [21], juntamente com a sua dissertação [22], além dessas publicações é possível encontrar trabalhos que corroboram o funcionamento deste dispositivo [23,24]. A figura 4 mostra o desenho esquemático desse aparato necessário para realização de ensaios de fadiga por fretting.…”

Section: Ensaios De Fadiga Por Frettingunclassified

Análise comparativa da resistência à fadiga por fretting entre os cabos condutores feitos de liga de alumínio 900 MCM e 823 MCM

et al. 2021

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RESUMO Com a necessidade de aperfeiçoamento do processo de transmissão e distribuição de energia elétrica, as indústrias e concessionárias desse setor estão em busca de componentes mais otimizados para suas linhas de transmissão. Em consequência, há a necessidade de aprimorar a formação do cabo condutor, que é o elemento mais oneroso das linhas elétricas. Nestas circunstâncias, condutores formados apenas por fios de alumínio aparentam ser mais vantajosos em relação aos cabos com alma de aço, obtendo melhores índices de ampacidade/peso, diminuindo assim, o custo de transmissão. Neste cenário, o objetivo deste artigo, foi verificar a influência do fenômeno de fadiga por fretting sob condições controladas, nos fios de liga de alumínio AA 6201 T81 e AA 1120 H19, que formam os condutores CAL 900 MCM e CAL 823 MCM, respectivamente. Para alcançar tal fim, criou-se um programa experimental capaz de adquirir os dados sobre a resistência à fadiga dos cabos condutores e dos fios de forma separada, a fim de analisar a influência do fretting sob o parâmetro de carga normal de contato de 750 N. Ao examinar os resultados, o condutor CAL 900 MCM obteve a menor resistência à fadiga, apesar de ser constituído por uma liga com melhores propriedades mecânicas. O mesmo resultado foi obtido nos ensaios de fadiga por fretting nos fios, deste modo, pôde-se inferir que a liga AA 6201 T81, embora possua melhor resistência à fadiga, ela é mais suscetível a falha na presença de fretting quando comparada a liga AA 1120 H19.

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Section: Surface Yield Line Of Aluminum Wiresmentioning

confidence: 99%

“…The crack starts from the aluminum-wire surface and gradually expands to the core during the swing process in the simulation. Figure 19b shows the fatigue band displaying the characteristics of fatigue fracture, which indicates that this area is essentially the fatigue source area [33,34]. Figure 19c shows the tear characteristics observed in the second half in the crack-growth region, which indicate that the effective-force area decreases, and the local tensile stress increases to exceed its yield limit when the crack extends to the later stage.…”

Section: Sem Observation and Analysis Of Aluminum Wiresmentioning

confidence: 99%

Research on Failure Mechanisms of Broken Strands of Jumper Wires for EHV Transmission Lines in Strong-Wind Areas

Han

Yongjie

et al. 2019

Metals

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The jumper wires of an extra-high voltage (EHV) transmission line in strong-wind areas in Northwest China frequently break down. We installed some acquisition devices to collect the data of the jumper wires and wind speed in the fault area of one 750-kV transmission line. We also developed a swing simulation machine based on the collected data. The machine could simulate the swing condition of the jumper wires under various wind speeds. We analyzed the broken aluminum wires obtained from the simulation experiment of jumper wires. Yield lines appeared on the surface of the broken aluminum wires in the simulation experiment. Proliferation of dislocation and grain deformation occurred in the broken aluminum wires using transmission electron microscopy observation. The results show that the aluminum wires in the experiment under a Level-6 wind and above were in a full yield state and demonstrated strain-fatigue failure condition. The fracture of the broken aluminum wires showed distinct strain-fatigue fracture characteristics using the scanning electron microscope fracture morphology analysis. From the combination of the abovementioned research, we conclude that the failure mechanism of the broken strands of the jumper wires of the EHV transmission line in the strong-wind area is mainly a strain-fatigue failure mechanism.

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Fatigue of two contacting wires of the ACSR Ibis 397.5 MCM conductor: Experiments and life prediction

Cited by 32 publications

References 24 publications

Fretting fatigue life assessment of overhead conductors using a clamp/conductor numerical model and biaxial fretting fatigue tests on individual wires

Fretting fatigue life assessment of overhead conductors using a clamp/conductor numerical model and biaxial fretting fatigue tests on individual wires

Análise comparativa da resistência à fadiga por fretting entre os cabos condutores feitos de liga de alumínio 900 MCM e 823 MCM

Research on Failure Mechanisms of Broken Strands of Jumper Wires for EHV Transmission Lines in Strong-Wind Areas

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