A numerical model to simulate ductile tearing-creep crack growth interaction

Robert Ainsworth, Y-R Oh, S-J Kim, Y-J Kim, Kamran Nikon

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Abstract

Ductile tearing and creep crack growth are generally treated independently but there are
situations in which they can occur simultaneously. First, creep crack growth calculations in
components are often continued to large defect sizes in order to determine when limiting
conditions for short-term fracture are reached. Secondly, in order to obtain data in reasonable
timescales, experimental creep crack growth tests are often performed at high loads such that
plasticity occurs in the tests, particularly as the crack grows to larger sizes. This paper
presents a numerical model to simulate the interaction of ductile tearing and creep crack growth
to address such cases. A strain-based damage model is introduced with total damage assumed to
be the linear summation of creep and plastic damage. The model is applied to Type 316H
stainless steel at 550 °C with the parameters in the damage model determined from tensile, creep
and fracture toughness test data. Predictions using the proposed model are then compared with
notched creep tensile and creep crack growth test results and shown to be in good agreement
with experimental measurements of creep deformation and crack growth.
Original languageEnglish
JournalInternational Journal of Pressure Vessels and Piping
Early online date17 Jun 2019
DOIs
Publication statusE-pub ahead of print - 17 Jun 2019

Keywords

  • Ductility damage model
  • Strain rate effect
  • Creep crack growth
  • Creep damage
  • Plastic damage

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