Journal ArticleDOI
A Mechanistic Model for Time-Dependent Fatigue
Saurin Majumdar,P. S. Maiya +1 more
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TLDR
In this paper, the authors used microstructural features of fracture surfaces of structural materials (e.g., austenitic stainless steels, low-alloy steels) as a guide in the formulation of generalized damage-rate equations that include interaction between a crack and cavities in a given environment.Abstract:
Elevated-temperature failure of structural materials (e.g., austenitic stainless steels, low-alloy steels) used in energy-conversion systems can occur by fatigue, creep, or by interactive processes involving creep, fatigue, and environment. The fracture surfaces of these materials exhibit a variety of microstructural features depending upon the type of material, strain rate, temperature, environment, hold times, and sequence of waveshapes. These microstructural observations have been used as a guide in the formulation of generalized damage-rate equations that include interaction between a crack and cavities in a given environment. Crack-propagation rate as well as total life of a fatigue specimen have been calculated by integrating the damage-rate equations over the inelastic strain history of the specimen, and compared with experimental results.read more
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Journal ArticleDOI
Thermomechanical fatigue, oxidation, and Creep: Part II. Life prediction
Richard W. Neu,Huseyin Sehitoglu +1 more
TL;DR: In this article, a life prediction model for crack nucleation and early crack growth based on fatigue, environment (oxidation), and creep damage was developed for 1070 steel for a wide range of test conditions and straintemperature phasings.
Journal ArticleDOI
Thermomechanical fatigue, oxidation, and creep: Part i. Damage mechanisms
Richard W. Neu,Huseyin Sehitoglu +1 more
TL;DR: Isothermal fatigue tests and both out-of-phase and in-phase thermomechanical fatigue tests were performed in air and in helium atmospheres as mentioned in this paper, and the results indicated that the fatigue lives are 2 to 12 times greater in helium than in air.
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Anisotropic creep damage in the framework of continuum damage mechanics
TL;DR: In this paper, two generalizations are presented and discussed, which use different kinds of tensors to describe the anisotropy of creep damage: the first one, by Murakami and Ohno introduces a second-rank damage tensor and a net stress tensor through a net area definition.
Journal ArticleDOI
Assessment of damage and life prediction of austenitic stainless steel under high temperature creep–fatigue interaction condition
TL;DR: In this paper, a new damage function based on a model for the creep-fatigue life prediction in terms of nucleation and growth of grain boundary cavities is proposed for austenitic stainless steel.
Journal ArticleDOI
Reliability analysis of creep-fatigue failure
Hongyin Mao,Sankaran Mahadevan +1 more
TL;DR: In this paper, a probabilistic model for the reliability analysis of the creep and fatigue of materials is proposed, which is not restricted by any symmetry assumption used in current studies, and a nonlinear creep-fatigue failure criterion function is introduced based on experimental data to facilitate analytical reliability approximations.