Numerical Simulation Analysis of Asymmetric Fatigue Failure for Iced Electric Power Transmission Line

doi:10.11901/1005.3093.2015.403

Chinese Journal of Materials Research

2016, Vol. 30

Issue (2): 149-155 DOI: 10.11901/1005.3093.2015.403

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Numerical Simulation Analysis of Asymmetric Fatigue Failure for Iced Electric Power Transmission Line

BAI Ru¹, CAI Gang², ZHANG Xiaomin², CHEN Wenqi¹, JIANG Yu^1,^*(

)

1. College of Material Science and Engineering , Sichuan University Chengdu 610000, China
2. State Grid Sichuan Electric Power Research Institute, Chengdu 610072, China

Cite this article:

BAI Ru, CAI Gang, ZHANG Xiaomin, CHEN Wenqi, JIANG Yu. Numerical Simulation Analysis of Asymmetric Fatigue Failure for Iced Electric Power Transmission Line. Chinese Journal of Materials Research, 2016, 30(2): 149-155.

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Abstract

Accident of icing induced line break occurred for the electric power transmissionline connecting Yucheng to Pugein the winter of 2011. Based on the observation and measured data, a broken section of the LGJ-630/45-type power line of stranded aluminum wires with steel core exhibited 12 broken aluminum wires with typical brittle fracture characteristics, but the rest wires were ductile fractured. On the basis of the theory of statics and dynamics of catenary beam element mode and large deflection bending beam element mode, the line breaking was analyzed by using ANSYS finite element method. Results show that the brittle fracture of 12 broken wires may be caused by fatigue, then the effective section of power line decreases, which further caused the rest wires to be broken due to overload. Icing and fluctuating wind lead the stress of the operating power line to be increased from 55.4 MPa to 97.9 MPa, which is the main cause to the line breaking. The power line resonate induced by the fluctuating wind, thus the mean stress of asymmetric fatigue increases, , and the fatigue life of the line significant decreases. Corresponding to all the above considerations, the realstress of the operating line increases from 97.9 MPa to 275.2 MPa and thereby the ductile fracture occurs due to that the real stress exceeded the failure stress of 221 MPa of the operating line.

Key words: materials failure and protection lead break brittle fracture ductile fracture asymmetric fatigue fatigue life

Received: 13 July 2015

ZTFLH:

TG430

About author: *To whom correspondence should be addressed, Tel: 13568899519, E-mail: JYscuniversity@163.com

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	Xiaomin ZHANG
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https://www.cjmr.org/EN/10.11901/1005.3093.2015.403 OR https://www.cjmr.org/EN/Y2016/V30/I2/149

Table 1 Characteristic parameters of power line

Fig.1 Fracture photograph of tension resistance section and suspension points

Fig.2 Section photograph of power line

Fig.3 The changing curve of operating stresses with ice thickness

Fig.4 The changing curve of operating stresses with wind speed

Fig.5 The changing curve of operating stresses with ice thickness and wind speed

Fig.6 The inherent frequency and mode shape of power line: (a) the first-order modal; (b) the second-order modal

Fig.7 Fluctuating wind speed time series and the power spectral density (PSD) curve of fluctuating wind

Fig.8 Time-history response curve of stress

Table 2 Statistics of operating stress and cycle time

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