Stress Ratio Effect on Ratcheting Behavior of AISI 4340 Steel

Ratcheting is known as accumulation of plastic strain during asymmetric cyclic loading of metallic materials under non-zero mean stress. This phenomenon reduces fatigue life of engineering materials and thus limits the life prediction capacity of Coffin-Manson relationship. This study intends to inv...

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Bibliographic Details
Published in:IOP conference series. Materials Science and Engineering 2016-02, Vol.115 (1), p.12016-12023
Main Authors: Bharathi, K Divya, Dutta, K
Format: Article
Language:English
Subjects:
Accumulation
Aircraft components
Cyclic loads
Fatigue life
Hardening
High strength low alloy steels
High strength steels
Life prediction
Nickel chromium molybdenum steels
Plastic deformation
Railroad wheels
Ratcheting
Serrated yielding
Steels
Strain
Stress ratio
Tensile properties
Tensile strength
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Summary:Ratcheting is known as accumulation of plastic strain during asymmetric cyclic loading of metallic materials under non-zero mean stress. This phenomenon reduces fatigue life of engineering materials and thus limits the life prediction capacity of Coffin-Manson relationship. This study intends to investigate the ratcheting behavior in AISI 4340 steel which is mainly used for designing of railway wheel sets, axles, shafts, aircraft components and other machinery parts. The effect of stress ratio on the ratcheting behaviour in both annealed and normalised conditions were investigated for investigated steel. Ratcheting tests were done at different stress ratios of -0.4, -0.6 and -0.8. The results showed that the material responds to hardening behavior and nature of strain accumulation is dependent on the magnitude of stress ratio. The post ratcheted samples showed increase in tensile strength and hardness which increases with increasing stress ratio and these variations in tensile properties are correlated with the induced cyclic hardening.
ISSN:1757-8981
1757-899X
DOI:10.1088/1757-899X/115/1/012016