On the study of the effects of notch shape on the creep damage under cyclic loading

• Published in: International journal of fatigue Vol. 29; no. 5; pp. 836 - 842
• Main Authors: Jiang, Y.P., Guo, W.L., Shao, X.J.
• Format: Journal Article
• Language: English
• Published: Oxford Elsevier Ltd 01-05-2007; Elsevier Science
• Subjects: Applied sciences; Creep; Cyclic loading; Damage; Exact sciences and technology; Fatigue; Finite element method; Mechanical properties and methods of testing. Rheology. Fracture mechanics. Tribology; Metals. Metallurgy; Notch specimen; User subroutine; Finite element method; Cyclic loading; Creep; Damage; Notch specimen; User subroutine; Geometrical shape; Notched test piece; Mechanical properties; Fatigue; Modeling; Notch sensitivity; Cyclic load
• ISSN: 0142-1123; 1879-3452
• DOI: 10.1016/j.ijfatigue.2006.09.002

Numerical calculations with the K-R damage law have been performed to study the creep damage development of different notch specimens (Circumferential, U-type and V-type notch) under cyclic loading. Emphasis was placed on the roles of notch geometry, multi-axial stress rupture parameter
α, frequency and stress ratio. Notch shape has a notable influence on the creep damage and fatigue life. Different notch specimens have different creep damage distributions. The development of creep damage in the minimum cross-section varies with notch shape and notch radius. For the Circumferential notch specimen, the maximum creep damage lies at the point in from notch tip; For the U-type and V-type notch specimens, the maximum creep damage always happens at the notch tip. Creep damage is greatly affected by the amplitude of load, stress ratio, multi-axial stress rupture parameter
α. Larger mean stress, stress ratio and material parameter
α cause faster development of the creep damage.