Joined application of a multiaxial critical plane criterion and a strain energy density criterion in low-cycle fatigue

Authors

  • Andrea Carpinteri
  • Giovanni Fortese
  • Camilla Ronchei
  • Daniela Scorza
  • Sabrina Vantadori
  • Filippo Berto

DOI:

https://doi.org/10.3221/IGF-ESIS.41.10

Keywords:

Critical plane approach, Control volume, Notched components, Multiaxial low-cycle fatigue, Strain-based criterion

Abstract

In the present paper, the multiaxial fatigue life assessment of notched structural components is performed by employing a strain-based multiaxial fatigue criterion. Such a criterion, depending on the critical plane concept, is extended by implementing the control volume concept reated to the Strain Energy Density (SED) approach: a material point located at a certain distance from the notch tip is assumed to be the verification point where to perform the above assessment. Such a distance, measured along the notch bisector, is a function of both the biaxiality ratio (defined as the ratio between the applied shear stress amplitude and the normal stress amplitude) and the control volume radii under Mode I and Mode III. Once the position of the verification point is determined, the fatigue lifetime is assessed through an equivalent strain amplitude, acting on the critical plane, together with a unique material reference curve (i.e. the Manson-Coffin curve). Some uniaxial and multiaxial fatigue data related to V-notched round bars made of titanium grade 5 alloy (Ti-6Al-4V) are examined to validate the present criterion.

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Published

28-06-2017

How to Cite

Joined application of a multiaxial critical plane criterion and a strain energy density criterion in low-cycle fatigue. (2017). Frattura Ed Integrità Strutturale, 11(41), Pages 66-70. https://doi.org/10.3221/IGF-ESIS.41.10

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