Advertisement

Journal of Failure Analysis and Prevention

, Volume 9, Issue 1, pp 23–27 | Cite as

Fracture Characteristics of Torsion-Bending Fatigue and Impact Fatigue Failure of Two Steel Pins in a Crawler Excavator

  • G. K. Triantafyllidis
  • A. V. Kazantzis
  • E. Κ. Drambi
  • El-Aour Sami
  • A. I. Kalantzis
Case History---Peer-Reviewed

Abstract

The arms of crawler excavators used in diverse quarries work under extremely harsh conditions. A common failure during their operation is the fracture of the steel pin joints that permit free movement of the two adjacent booms closer to the machine housing, as well as the motion of the backhoe bucket against its nearest boom. This work presents examples of two steel pin joint failures. The pins had a diameter of 90 mm, and the failures resulted in high stand-by time for repairs. The first failure was caused by the combination of bending and torsion fatigue, and the second fracture occurred because of impact fatigue. Optical metallography and scanning electron microscopy/electron dispersive x-ray analysis (SEM/EDS) analysis provided a better understanding of the failure mechanism of the two steel pins, since these particular components exhibited excellent fatigue characteristics in both mating fracture surfaces.

Keywords

Pins Fractography Fatigue Impact Torsion-bending fatigue 

References

  1. 1.
    Sachs, N.W.: Understanding the surface features of fatigue fractures: How they describe the failure cause and the failure history. J. Fail. Anal. Prev. 5(2), 11 (2005)CrossRefGoogle Scholar
  2. 2.
    Macabe, C., Socie, D.F.: Crack growth mechanism in precracked torsional fatigue specimens. Fatigue Fract. Eng. Mater. Struct. 24, 607 (2001)CrossRefGoogle Scholar
  3. 3.
    Wulpi, D.J.: Failure of Shafts, Failure Analysis and Prevention, vol. 11. ASM Handbook, p. 459. ASM International, Materials Park, OH (1995)Google Scholar
  4. 4.
    Vander Voort, G.F.: Visual Examination and Light Microscopy, Fractography, vol. 12. ASM Handbook, p. 91. ASM International, Materials Park, OH (1995)Google Scholar
  5. 5.
    Sattari-Far, I.: Failure study of connecting shafts of a plug screw feeder in a paper production plant. Eng. Fail. Anal. 10, 341 (2003)CrossRefGoogle Scholar
  6. 6.
    Wulpi, D.J.: Understanding How Components Fail, 2nd edn., p. 117. ASM International, Materials Park, OH (2000)Google Scholar
  7. 7.
    Atlas of Fractographs, vol. 12, Fractography, p. 378. ASM International, Materials Park, OH (1995)Google Scholar
  8. 8.
    Kubel Jr., E.J.: Fracture mechanics. In: Wulpi, D.J. (ed.) Understanding How Components Fail, 2nd edn, p. 243. ASM International, Materials Park, OH (2000)Google Scholar

Copyright information

© ASM International 2008

Authors and Affiliations

  • G. K. Triantafyllidis
    • 1
  • A. V. Kazantzis
    • 2
  • E. Κ. Drambi
    • 1
  • El-Aour Sami
    • 1
  • A. I. Kalantzis
    • 3
  1. 1.Faculty of Engineering, Chemical Engineering Department, Laboratory of Materials TechnologyAristotle University of ThessalonikiThessaloniki, Region of Central MacedoniaGreece
  2. 2.Department of Applied Physics, Materials Innovation Institute (formerly Netherlands Institute of Metals Research)University of GroningenGroningenThe Netherlands
  3. 3.Kalantzis Marble SAEdessa, Region of Central MacedoniaGreece

Personalised recommendations