Abstract
A previously developed theoretical model, used for computer calculations of the creep deformation and rupture behaviour of butt-welded, cold-worked AISI 316 steel tubes, has been further refined. By including plastic strain and primary creep strain in the constitutive equation for creep, the strain predictions were considerably improved when compared with the results ofa previous investigation. The excellent predictions of time to rupture and of position and orientation of the cracks achieved in that investigation were virtually unaffected by the refinement. The appreciably improved descriptions of the deformation behaviour were achieved by using constitutive equations in the form of a Ludwik–Hollomon expression for the tensile deformation, and an equation derived from time-hardening theory for the creep deformation.
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