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Journal of Failure Analysis and Prevention

, Volume 9, Issue 3, pp 208–212 | Cite as

Brittle Fracture of a Lifting Stud During Assembly Operations

  • Marina Banuta
  • Isabelle Tarquini
  • Benoit Gauvin
Case History---Peer-Reviewed

Abstract

A lifting stud from a stator frame broke during assembly operations. The part was hot rolled from a 50 W grade low-carbon steel (according to the Canadian standard CSA G40.21-04), which is the equivalent of AISI 1022 grade. Complete metallurgical characterization of the material showed that the chemical and mechanical requirements of the aforementioned standard were met. Moreover, the tensile testing showed that the material had good ductility. Fractographic investigation, both at the macroscale and microscale levels, indicated that the lifting stud failed under bending overload, in a brittle mode. It was found that brittle behavior of the ductile material was caused by the sudden application of the load combined with triaxial stresses promoted by the threaded geometry.

Keywords

Bending overload Brittle fracture Failure analysis Triaxial stress 

References

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    Principles of Failure Analysis—Types of Failure and Stress, Course 0335, Lesson 2, pp. 8–9. American Society for Metals (2002)Google Scholar

Copyright information

© ASM International 2009

Authors and Affiliations

  • Marina Banuta
    • 1
  • Isabelle Tarquini
    • 1
  • Benoit Gauvin
    • 1
  1. 1.SGS CanadaMontrealCanada

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