Three-dimensional finite element calculations were performed for primary creep deformation in a novel double shear specimen. Two characteristic creep behaviors were considered: one in which the stress exponent, n, is equal to 3 and another in which n is equal to 5. Both models resulted in a quasi-stationary stress state in which the principal stresses change only slightly with time while the von Mises effective stress and principal facet stress reach essentially constant values. The uniformity of this quasi-stationary stress state throughout the gage section indicates that it may be used to characterize the overall stresses driving creep deformation and damage.
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