A reassessment of the multiaxial ductility C* creep crack growth equation based on the strain energy integral of the HRR singular field terms

摘要: Abstract A revaluation of the upper bound plane strain multiaxial C* crack growth rates is undertaken for a range materials. The analysis assumes that ductility factor can be approximated by taking integrated dimensionless deviatoric and hydrostatic energy density HRR singular fields. Using equivalency approximation between plastic elastic energy, damage mechanics approach used to determine tip triaxial constraint. new was found independent power law behaviour, stress fields gave close one. enables estimates under in Nikbin Smith Webster equation undertaken. Creep data from nine materials were assess rates. results suggest current could decreased thirty times three