Browsing by Author "Dean, David W."

Now showing 1 - 2 of 2
  • Thumbnail Image
    ItemOpen Access
    Effects of plastic pre-straining level on the creep deformation, crack initiation and growth behaviour of 316H stainless steel
    (Elsevier, 2016-03-19) Mehmanparast, Ali; Davies, C. M.; Dean, David W.; Nikbin, Kamran
    The effects of the material pre-straining level, in the form of plastic pre-compression at room temperature, on the tensile, creep deformation, creep crack initiation and growth behaviour of 316H stainless steel have been examined at 550 °C. Experiments have been performed on the 4%, 8% and 12% pre-compressed specimens and the results are compared with existing data on the pre-compressed material to investigate the change in mechanical response, creep failure, creep crack initiation and growth behaviour of 316H over a range of plastic pre-straining levels. Comparisons are also made to short term and long term test data on the as-received material. It has been found that creep ductility and rupture times decreased with an increase in pre-strain levels considered. The test results obtained from different material states are discussed in terms of the influence of material pre-straining level on the microstructural deformation, mechanical response, creep deformation and crack growth behaviour of the material.
  • Thumbnail Image
    ItemOpen Access
    Plastic pre-compression and creep damage effects on the fracture toughness behaviour of Type 316H stainless steel
    (Elsevier, 2014-10-14) Mehmanparast, Ali; Davies, C. M.; Dean, David W.; Nikbin, Kamran
    The influence of inelastic damage in the form of plastic pre-strain and creep damage, on fracture toughness of Type 316H stainless steel has been examined. Creep damage has been introduced into the 8% pre-compressed material by interrupting creep crack growth tests. Comparisons have been made between the fracture toughness test results from the as-received, pre-compressed and creep damaged materials. Furthermore, the effects of creep crack discontinuities on the crack tip strain fields have been examined by digital image correlation measurements. Inelastic damage was found to reduce the fracture toughness of the material, with creep damage having more severe effects than pre-strain.