Modelo de weibull compatible para la definición de la región de fatiga de bajo número de ciclos

  1. Alfonso Fernández Canteli 1
  2. Enrique Castillo 2
  3. Sergio Blasón 3
  4. Abílio de Jesus 4
  5. José Correia 4
  1. 1 Universidad de Oviedo
    info
    Universidad de Oviedo

    Oviedo, España

    ROR https://ror.org/006gksa02

    Geographic location of the organization Universidad de Oviedo
  2. 2 Real Academia de Ingeniería y Real Academia de Ciencias de España
  3. 3 Federal Institute For Materials Research and Testing
    info
    Federal Institute For Materials Research and Testing

    Berlín, Alemania

    ROR https://ror.org/03x516a66

    Geographic location of the organization Federal Institute For Materials Research and Testing
  4. 4 Universidade Do Porto
    info
    Universidade Do Porto

    Oporto, Portugal

    ROR https://ror.org/043pwc612

    Geographic location of the organization Universidade Do Porto
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Journal:
Revista española de mecánica de la fractura

ISSN: 2792-4246

Year of publication: 2023

Issue: 5

Pages: 163-168

Type: Article

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Abstract

The characteristic sigmoidal shape exhibited by the S-N field when the LCF region is included, is attributed to nonlinearity in the stress-strain ratio when the applied stresses surpass the proportionality limit in the σ-ε diagram. Models addressing the problem under this sigmoidal assumption present inconsistencies due to their inability to satisfy the compatibility condition between the vertical and horizontal CDFs in the S-N field and resort to arbitrary premises to define the percentile curves of the S-N field impeding a reliable prediction of the fatigue lifetimes. In this work, an alternative model is proposed based on the definition of a new reference variable for the S-N field that allows its extension to the LCF region and the two-fold asymptotic character (horizontal and vertical) of the basic probabilistic model proposed by Castillo and Canteli to be guaranteed. The new model is applied to the evaluation of the Holmen’s experimental fatigue campaign and to that of Correia et al on P355NL1, which include fatigue results in both low and high number of cycles, in the latter at different values of the stress ratio, R.

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