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Interior induced fatigue of surface‐strengthened steel under constant and variable loading: Failure mechanism and damage modeling
Author(s) -
Li W.,
Sun R.,
Gao N.,
Wang P.,
Sakai T.
Publication year - 2019
Publication title -
fatigue and fracture of engineering materials and structures
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.887
H-Index - 84
eISSN - 1460-2695
pISSN - 8756-758X
DOI - 10.1111/ffe.13103
Subject(s) - amplitude , materials science , constant (computer programming) , stress intensity factor , structural engineering , tension (geology) , stress (linguistics) , variable (mathematics) , failure mechanism , composite material , mechanics , fracture mechanics , mathematics , engineering , optics , mathematical analysis , physics , ultimate tensile strength , computer science , linguistics , philosophy , programming language
Pulsating tension tests with constant amplitude (CA) and variable amplitude (VA) were conducted to investigate the interior failure mechanisms of a carburized Cr steel, and a cumulative damage model with the fine granular area (FGA) formation process was proposed in this study. Such a steel represents the continuously descending S‐N (stress‐number of cycles) curve characteristics associated with inclusion‐FGA‐fisheye induced failure even under variable amplitude. Due to crack growth retardations and accelerations resulted from the interaction effect between stepwise resets of the applied stress, the crack morphology under variable amplitude loading is much rougher. The interior failure mechanism was elucidated in combination with the determination of stress intensity factor values at different crack tips. Based on proposed damage model, the agreement between the predicted and experimental results is fairly good within the factor‐of‐two range.