Journal
FATIGUE & FRACTURE OF ENGINEERING MATERIALS & STRUCTURES
Volume 41, Issue 11, Pages 2362-2375Publisher
WILEY
DOI: 10.1111/ffe.12845
Keywords
Chaboche unified viscoplasticity model; creep-fatigue interaction; finite element analysis; linear damage summation method; modified 9Cr-1Mo steel; strain energy
Ask authors/readers for more resources
Creep-fatigue interaction behavior of grade 91 steel at 823 K has been studied. Creep component has been introduced with hold times 1, 10, and 30 minutes in tension and compression in continuous strain cycling. Fatigue life reduced due to application of hold and reduction was found to be more in compressive hold. The effect of various factors such as mean stress, stress relaxation, oxidation, microstructure, and inelastic strain accumulation on significant reduction in fatigue life in compression hold has been investigated. The oxidation has been observed as the key parameter that caused significant fatigue life reduction in compressive hold as compared with tensile hold. Chaboche unified viscoplasticity model has been used to understand the material's cyclic elasto-viscoplastic behavior. The simulation results were in agreement with the experimental results. Fatigue lives under creep-fatigue condition were estimated using frequency-modified strain energy damage function method and linear damage summation method. Frequency-modified strain energy damage function method under estimated the fatigue lives whereas linear damage summation method overestimated the lives.
Authors
I am an author on this paper
Click your name to claim this paper and add it to your profile.
Reviews
Recommended
No Data Available