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access icon free Experimental investigation on safety and reliability of ball-eye under bending load in electrical systems

  • Author(s): Zhan-Shan Xie 1, 2 ; Yuan Zheng 1 ; An-Ni Wang 3 ; Qian Tian 4 ; Yuan Chen 5 ; Kan Kan 1 ; Yi Lu 5
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  • Source: Volume 12, Issue 15, 28 August 2018, p. 3692 – 3698
    DOI:  10.1049/iet-gtd.2017.1553 , Print ISSN 1751-8687, Online ISSN 1751-8695
© The Institution of Engineering and Technology
Received 05/10/2017, Accepted 19/05/2018, Revised 16/04/2018, Published 24/05/2018

In view of the frequent failure of the ball-eye (BE) in the transmission line, the force analysis of BE in extreme weather is carried out, and a set of bending fatigue test equipment was designed. It is the first time to carry out the fatigue test of BE treated by normalising, annealing and quenching and tempering process under bending loads of 2330, 3495 and 4560 N. Meanwhile, the bending fatigue life curve is plotted. From the macro and micro point of view, the characteristics and the content of the elements of the fracture, and the influence of the internal structure on the mechanical properties of three samples of different heat treatment processes are analysed. Conclusion indicates that the mechanical properties of the BE treated by normalising process are best, whose microstructure is fine and uniform ‘ferrite + pearlite’. Comparing the life of BE withstood tension load, it is revealed that bending load is the main reason to accelerate the failure of BE.

Inspec keywords: failure analysis; tempering; normalising; power transmission lines; power transmission reliability; bending; quenching (thermal); annealing; safety

Other keywords: electrical systems; bending fatigue test equipment; ball-eye reliability; uniform ferrite + pearlite; annealing-and-quenching process; tempering process; transmission line; bending loads; BE force analysis; ball-eye failure; treatment processes; ball-eye safety; normalising process

Subjects: Plasticity (mechanical engineering); Annealing processes in semiconductor technology; Power and plant engineering (mechanical engineering); Power transmission, distribution and supply; Heat treatment; Power transmission lines and cables; Plant engineering, maintenance and safety; Maintenance and reliability; Reliability; Health and safety aspects

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