Abstract
This paper proposes a new numerical method of a creep damage evaluation for modified 9Cr-1Mo steel welded joints. The creep damage mechanisms of this steel are mainly the nucleation of creep voids, their growth and coalescence in a softening region of its heat affected zone. Creep constitutive equations have been formulated using the Gurson Model which was originally developed for the ductile fracture analysis of porous materials. The damage parameter of this model is the void volume fraction that is easy to compare with measured damage values. To include the coupling effects between damage and deformation, the locally coupled technique has been employed, because the damaged area in a welded joint of this steel is small in comparison with the wall thickness. The accuracy of this proposed method has been examined by simulating uniaxial creep tests on round bar specimens of welded joints. Their lives have been predicted within a factor of two.
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