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Practical Failure Analysis

, Volume 2, Issue 3, pp 71–74 | Cite as

Failure analysis of a wire rope

  • K. P. Balan
Peer Reviewed Articles

Abstract

Wire ropes, pulleys, counterweights, and connecting systems are used for auto tensioning of contact wires of electric railways. A wire rope in one such auto tensioning system suffered premature failure. Failure investigation revealed fatigue cracks initiating at nonmetallic inclusions near the surface of individual wire strands in the rope. The inclusions were identified as Al-Ca-Ti silicates in a large number of stringers, and some oxide and nitride inclusions were also found. The wire used in the rope did not conform to the composition specified for AISI 316 grade steel, nor did it satisfy the minimum tensile strength requirements. Failure of the wire rope was found to be due to fatigue; however, the ultimate fracture of the rope was the result of overload that occurred after fatigue failure had reduced the number of wire strands supporting the load.

Keywords

wire rope austenitic stainless steel nonmetallic inclusions fatigue striations 

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References

  1. 1.
    Anon.: inCode of Practice for the Selection Care and Maintenance of Steel Wire Ropes, BS6570, British Standard Institution, London, 1986.Google Scholar
  2. 2.
    Anon.: inMetals Handbook, vol. 11,Failure Analysis and Prevention, 9th ed., American Society for Metals, Metals Park, OH, 1986, pp. 119–20.Google Scholar
  3. 3.
    G.E. Dieter:Mechanical Metallurgy, 3rd ed., McGraw-Hill, London, 1988, p. 375.Google Scholar

Copyright information

© ASM International - The Materials Information Society 2002

Authors and Affiliations

  • K. P. Balan
    • 1
  1. 1.Defence Metallurgical Research LaboratoryP.O. KanchanbaghIndia

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