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Journal of Failure Analysis and Prevention

, Volume 12, Issue 4, pp 402–407 | Cite as

Failure of a Bucket-Wheel Stacker Reclaimer: Metallographic and Structural Analyses

  • L. S. Araujo
  • L. H. de Almeida
  • E. M. Batista
  • A. Landesmann
Technical Article---Peer-Reviewed

Abstract

The structural collapse of an iron-ore bucket-wheel stacker reclaimer at the beginning of operation was investigated by means of mechanical tests, microstructural characterization, and computational structural analysis. The mechanical failure was a consequence of a brittle fracture by cleavage. The crack followed the heat-affected zone of a welded joint connecting a rectangular hollow section member and a plate flange. The main factors contributing to failure were related with a combination of design-in and manufacturing-in factors like high load–strength ratio at the point of failure, local stress concentration as a result of geometry restrictions, and weld defects. This particular section was responsible for the load transfer between the front tie member and the boom extremity, and its failure was the main cause of the catastrophic failure of the equipment.

Keywords

Bucket-wheel stacker reclaimer Failure analysis Structural collapse Welded joint 

References

  1. 1.
    Araujo, L.S., de Almeida, L.H., Batista, E.M.: Analysis of a bucket-wheel stacker reclaimer structural failure. In: Proceedings of the Conference ‘‘Materials Science & Technology 2009”, Charles R. Morin Memorial Symposium on Failure Analysis and Prevention, Pitsburgh, proceedings on CD (2009)Google Scholar
  2. 2.
    Morin, C., Packer, K., Slater, J.: Failure analysis associated with mining and heavy mechanical equipment. In: McCall, J.L., French, P.M. (eds.) Metallography in Failure Analysis, pp. 191–205. Plenum Press, Houston (1977)Google Scholar
  3. 3.
    Bošnjak, S., Arsić, M., Zrnić, N., Rakin, M., Pantelić, M.: Bucket wheel excavator: integrity assessment of the bucket wheel boom tie-rod welded joint. Eng. Fail. Anal. 18, 212–222 (2011)CrossRefGoogle Scholar
  4. 4.
    Bošnjak, S., Zrnić, N., Simonović, A., Momčilović, D.: Failure analysis of the end eye connection of the bucket wheel excavator portal tie-rod support. Eng. Fail. Anal. 16, 740–750 (2009)CrossRefGoogle Scholar
  5. 5.
    Hadianfard, M.J., Hadianfard, M.A.: Structural failure of a telescopic shiploader during installation. J. Fail. Anal. Preven. 8, 564–571 (2008)CrossRefGoogle Scholar
  6. 6.
    Arsić, M., Bošnjak, S., Zrnić, N., Sedmak, A., Gnjatović, N.: Bucket wheel failure caused by residual stresses in welded joints. Eng. Fail. Anal. 18, 700–712 (2011)CrossRefGoogle Scholar
  7. 7.
    Rusiński, E., Czomochowski, J., Iluk, A., Kowalczyk, M.: An analysis of the causes of BWE counterweight boom support fracture. Eng. Fail. Anal. 17, 179–191 (2010)CrossRefGoogle Scholar
  8. 8.
    Wintle, J., Pargeter, R.: Technical failure investigation of welded structures. Eng. Fail. Anal. 12, 1027–1037 (2005)CrossRefGoogle Scholar
  9. 9.
    Fry, P.: Loads and stresses—the real causes of failures in surface mining machinery. Pract. Fail. Anal. 3, 7–14 (2003)Google Scholar
  10. 10.
    Willibad, S.: Bolted connections for rectangular hollow sections under tensile loading. Universität Fridericiana zu Karlsruhe, Karlsruhe (2003)Google Scholar
  11. 11.
    ASTM A325-10. Standard Specification for Structural Bolts, Steel, Heat Treated, 120/105 ksi Minimum Tensile Strength. ASTM International, West Conshohocken (2011)Google Scholar
  12. 12.
    AISC S342. Load and Resistance Factor Design Specification for Structural Steel Buildings. American Institute of Steel Construction, Chicago (1993)Google Scholar
  13. 13.
    ASTM A36/A36M-08. Standard Specification for Carbon Structural Steel. ASTM International (2011)Google Scholar

Copyright information

© ASM International 2012

Authors and Affiliations

  • L. S. Araujo
    • 1
  • L. H. de Almeida
    • 1
  • E. M. Batista
    • 1
  • A. Landesmann
    • 1
  1. 1.Universidade Federal do Rio de JaneiroRio de JaneiroBrazil

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