Fatigue Failure of Flanged Thermowell

  • Ahmad Ivan Karayan
  • Yudha Pratesa
  • Ahmad Ashari
  • Deni Ferdian
Case History—Peer-Reviewed

Abstract

A fractured flanged thermowell was received for analysis. The fracture was located at the root of “U” insertion/immersion length which was welded to the flange. The failure of flanged thermowell was attributed to the vortex-induced fatigue. The failure was initiated by the weld failure to withstand the fluctuating load resulted from vortex after years of service. This weld failure then created stress raisers, as evidenced by the ratchet marks and river marks near the outer surface.

Keywords

Failure analysis Fatigue analysis Ferrous metals 

References

  1. 1.
    Giosan, I., Eng, P.: Vortex shedding induced loads on free standing structures. Struct. Vortex Shedding Response Estim. Methodol. Finite Element Simul.Google Scholar
  2. 2.
    Foley, C.M., Ginal, S.J., Peronto, J.L., Fournelle, R.A.: Structural Analysis of Structures and Luminaire Supports. Marquette University, Wisconsin (2004)Google Scholar

Copyright information

© ASM International 2011

Authors and Affiliations

  • Ahmad Ivan Karayan
    • 1
  • Yudha Pratesa
    • 1
  • Ahmad Ashari
    • 1
  • Deni Ferdian
    • 1
  1. 1.Metallurgy and Materials EngineeringUniversity of IndonesiaJawa BaratIndonesia

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