Abstract
The interaction of creep and fatigue in structural materials under high-cycle loading is modeled using isochronic limit stress diagrams. The hypothesis of a unified limit diagram invariant to the time to failure is used. The unified diagram is given by a cosine power function with the exponent describing creep-fatigue interaction and encompasses convex, concave, and S-like curves. The models build are tested for aluminum alloys, heat-resistant steels, creep-resistant steels and alloys, and laminates
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