Journal
FATIGUE & FRACTURE OF ENGINEERING MATERIALS & STRUCTURES
Volume 42, Issue 10, Pages 2383-2396Publisher
WILEY
DOI: 10.1111/ffe.13103
Keywords
3-D analysis; damage modeling; fracture morphology; surface treatment; very high cycle fatigue
Funding
- National Natural Science Foundation of China [51775043, U1864210]
- State Key Laboratory of Automotive Simulation and Control [20161109]
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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.
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