Analysis of anchor rod failure in a guyed transmission tower: Influence of microstructures and corrosion mechanisms

Matos, Tiago Scheffer de; Portella, Kleber Franke; Henke, Sérgio Luiz; Bragança, Mariana O.G.P.; Galvao, Marcio; Dias, B.G.; Lagoeiro, Leonardo Evangelista; Almeida, Larissa Medeiros de

doi:10.1016/j.engfailanal.2020.105166

Cited by 14 publications

(6 citation statements)

References 33 publications

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“…The fan configuration leads to higher buckling loads and vibration frequencies than the parallel configuration due to its higher horizontal force component at the middle height of the tower. A palpable decrease of buckling loads and vibration frequencies is observed due to the loss of one or two inferior cables leading to a loss of circumferential symmetry and a decrease of the flexural stiffness of the tower, justifying the large number of accidents recorded in the literature caused by the cable rupture [6]. Figure 2 shows the first vibration mode of the fan and parallel configuration.…”

Section: Linear Analysismentioning

confidence: 98%

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Assessment of the Elastoplastic Nonlinear Static and Dynamic Behavior of Guyed Antenna Towers Subjected to Cable Rupture

2022

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Cable‐stayed antenna towers are slender structures composed of a central mast and several cable levels and exhibit a highly non‐linear behavior under static and dynamic loads, due to the mast‐cable interaction and the tower height. Many accidents reported in literature are due to cable rupture. Thus, the aim of the present work is to study the effect of cables rupture and plasticity on the load capacity, stability and nonlinear oscillations of a cable stayed tower considering the influence of both geometric and material nonlinearity. For this, finite element models of cable‐stayed towers with two levels of pre‐tensioned cables are developed, considering both fan and parallel cable distributions. Initially, the linear behavior of the structure is evaluated through the natural frequencies and critical loads. Next, the non‐linear equilibrium paths of each model are obtained, applying the concept of modal imperfection. Finally, forced free and damped vibration analyses are performed. For this, time responses, phase plane projections, Fourier transforms and spectrographs are used. The results confirm and quantify the strong influence of the loss of one or more cables on the response of the guyed tower.

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Section: Linear Analysismentioning

confidence: 98%

“…modelling of the dynamic response of iced transmission lines subjected to cable rupture and ice shedding. Recently, Matos et al [6] analysed the anchor rod failure in a guyed transmission tower, studying, among other aspects, the effect of corrosion on the failure.…”

Section: Introductionmentioning

confidence: 99%

Assessment of the Elastoplastic Nonlinear Static and Dynamic Behavior of Guyed Antenna Towers Subjected to Cable Rupture

2022

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“…These aluminum alloy conductors are exposed to various corrosive environments and carry high currents in service conditions. Previous reports indicated that the corrosion behavior of conductor metals in high-power transmission lines was quite different from the same type of those materials in other fields (Gouda and Al-gabalawy, 2021;Matos et al, 2021). Thus, the current-carrying condition in the overhead conductors of high-voltage transmission would influence the corrosion behavior of these conductors.…”

Section: Introductionmentioning

confidence: 96%

Atmospheric corrosion acceleration effect on commercial aluminum alloys in current-carrying condition

Gao,

Li,

et al. 2024

ACMM

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Purpose The purpose of this paper is to study the effect of current-carrying condition on the electrochemical process and atmospheric corrosion behavior of the commercial aluminum alloys. Design/methodology/approach Potentiodynamic polarization tests were performed to study the electrochemical process of the aluminum alloys. Salt spray tests and weight loss tests were carried out to study the atmospheric corrosion behavior. The corrosion morphology of the alloys was observed, and the products were analyzed. Findings The corrosion process of four aluminum alloys was accelerated in the current-carrying condition. Moreover, the acceleration effect on A2024 and A7075 was much stronger than that on A1050 and A5052. The main factors would be the differences in microstructure and corrosion resistance between these alloys. As the carried current increased, the corrosion rate and corrosion current density of the aluminum alloys gradually increased, with the protection of the corrosion product film decreasing linearly. Originality/value This is a recent study on the corrosion behavior of conductors under current-carrying condition, which truly understands the corrosion status of power grid materials. Relevant results provide support for the corrosion protection and safe service of aluminum alloy in power systems.

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“…Studies have shown that high-strength anchor steels are vulnerable to SCC in chloridecontaining environments [6,7]. The SCC mechanism is considered a mixture of anodic dissolution (AD) and hydrogen embrittlement (HE).…”

Section: Introductionmentioning

confidence: 99%

Enhancing the SCC Resistance of the Anchor Steel with Microalloying in a Simulated Mine Environment

Du,

An,

Wang

et al. 2023

Materials

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This work explored a new idea for enhancing the resistance to stress corrosion cracking (SCC) of mining anchor steel through microalloying. Microalloyed anchor steels with Nb, Cu, Ni, Sb, and C were prepared through vacuum smelting and hot rolling. Electrochemical measurements, slow strain rate tensile (SSRT) tests, and fracture morphology observations were used to study the electrochemical and SCC behavior in the simulated mine environment. The results proved that the microstructure of microalloyed steels varies slightly. Adding Ni, Cu, and Sb can improve the mechanical properties of the anchor steel, while reducing C content decreases tensile strength as a result of loss of the solution-strengthening effect. The addition of Sb, Cu, Ni, and reducing the content of C enhances the resistance to corrosion and SCC by mitigating anodic dissolution (AD), while adding Nb improves SCC resistance by inhibiting hydrogen embrittlement (HE). The combined addition of 1% Ni, 0.5% Cu, 0.05% Nb, 0.1% Sb, and 0.5% C presented the highest SCC resistance, which is a promising prospect for the development of high-performance, low-alloy anchor steels. The combined addition of 1% Ni, 0.5% Cu, 0.05% Nb, and 0.1% Sb resulted in the inhibition of electrochemical reactions and corrosion. As a result of the synergistic effect of the microalloy, both AD and HE mechanisms were simultaneously inhibited, which greatly enhanced SCC resistance.

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Analysis of anchor rod failure in a guyed transmission tower: Influence of microstructures and corrosion mechanisms

Cited by 14 publications

References 33 publications

Assessment of the Elastoplastic Nonlinear Static and Dynamic Behavior of Guyed Antenna Towers Subjected to Cable Rupture

Assessment of the Elastoplastic Nonlinear Static and Dynamic Behavior of Guyed Antenna Towers Subjected to Cable Rupture

Atmospheric corrosion acceleration effect on commercial aluminum alloys in current-carrying condition

Enhancing the SCC Resistance of the Anchor Steel with Microalloying in a Simulated Mine Environment

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