Energy criterion for fatigue strength of wood structural members

Article Abstract:

A nonlinear Eyring's three-element mechanical model allows the study of fatigue strength of wood structural members under sinusoidal load. The Reiner-Weissenberg strength theory is also used for the analysis. The theory states that the failure is affected by the maximum amount of free energy that can be stored elastically in the material. The loading path has no affect on the elastic energy stored viscoelastically before rupture. The characteristics of fatigue life of Douglas-fir wood under cyclic bending load are discussed.

Research, Fatigue (Materials), Cellulose

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Mechanistic approach for creep-fatigue evaluation of 9Cr-1Mo-V-Nb steel

Article Abstract:

A mechanistic model uses damage mechanics approach to evaluate the creep-fatigue interactions in 9Cr-1Mo-V-Nb steel. A creep damage decreases under compression and increases under tension. The model assumes the presence of an element damage in each of fatigue and creep damage, related to specific size and density. Accumulation of fatigue damage involves an initiation stage and a growth stage. The model estimates the experimental creep-fatigue life under variable strain conditions.

Metal fatigue, Steel

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Evaluation of creep-fatigue life prediction methods for low-carbon nitrogen-added 316 stainless steel

Article Abstract:

An experiment was conducted to determine the strength and stress relaxation behavior of a low-carbon nitrogen-added 316 stainless steel which is being used as primary structural material in the construction of electric utilities. Long term-creep tests and creep-fatigue tests which utilized time fraction rule and ductility exhaustion methods were conducted. Results revealed that creep-fatigue life prediction could be analyzed by using the ductility exhaustion method.

Analysis, Stainless steel, Stresses (Materials), Steel, Stainless, Stress relaxation (Materials)

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