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Diverter damper force analysis and stress intensity factors for its double fillet welds by boundary element method

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Abstract

Mechanisms usually transmit power by welded links into a shaft. Should this weld be partial, like fillet welds, there will be an area of stress concentration that could behave like a crack due to sharp corners. These can lead to structural failures due to fatigue. Consequently, to properly design, inspect and maintain these mechanisms it is necessary to use fracture mechanics stress intensity factors. The crack mesh simplicity required by the boundary element method allows easy modeling even for complex geometry. This technique will be used to obtain such parameters for a double fillet weld found in a diverter damper mechanism responsible for controlling hot gas flow to heat recovery steam generator in power plants. But the solutions presented can be used for similar geometrical configurations, specially to shaft link mechanisms. Empirical equations were also obtained to further ease fracture mechanics and fatigue analysis for this kind of geometry.

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Notes

  1. With quadratic displacement interpolation and linear geometry interpolation.

  2. Indeed BS-7910 says to set \(\frac{1+\upsilon }{1-{\upsilon }^{2}}=1\), which results in a conservative approach.

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Authors and Affiliations

  1. Department of Maintenance, Petrobras S.A, Três Lagoas, Mato Grosso Do Sul, Brazil

    Leandro de Souza Schiara

  2. Department of Mechanical Engineering, Universidade Estadual Paulista (UNESP), Brasil Avenue, 56, Ilha Solteira, São Paulo, Brazil

    Amarildo Tabone Paschoalini

Authors
  1. Leandro de Souza Schiara
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  2. Amarildo Tabone Paschoalini
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Correspondence to Leandro de Souza Schiara.

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Technical Editor: Paulo de Tarso Rocha de Mendonça.

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de Souza Schiara, L., Paschoalini, A.T. Diverter damper force analysis and stress intensity factors for its double fillet welds by boundary element method. J Braz. Soc. Mech. Sci. Eng. 43, 114 (2021). https://doi.org/10.1007/s40430-021-02812-0

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  • DOI: https://doi.org/10.1007/s40430-021-02812-0

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