Ratcheting Fatigue Behaviour of Zircaloy?2 at 300 °C

R. S. Rajpurohit; Prerna Mishra; N. C. Santhi Srinivas; S. R. Singh; V. Singh

doi:10.1007/s12540-020-00686-w

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자료유형: 학술저널

저자정보: R. S. Rajpurohit (Indian Institute of Technology (Banaras Hindu University)) Prerna Mishra (Indian Institute of Technology (Banaras Hindu University)) N. C. Santhi Srinivas (Indian Institute of Technology (Banaras Hindu University)) S. R. Singh (Indian Institute of Technology (Banaras Hindu University)) V. Singh (Indian Institute of Technology (Banaras Hindu University))

저널정보: 대한금속·재료학회 Metals and Materials International Metals and Materials International Vol.27 No.9

발행연도: 2021.9

수록면: 3,143 - 3,154 (12page)

DOI: 10.1007/s12540-020-00686-w

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In laboratory, materials designed for engineering applications, specifically for fatigue, are generally tested under symmetricalcyclic loading (stress ratio, R = ?1), but many structural components exhibit less fatigue life than predicted from symmetricloading due to asymmetric cyclic loading during service. This study deals with fatigue behaviour of Zircaloy-2 and presentsthe effect of mean stress (σm), stress amplitude (σa), stress rate ( ? ) on fatigue life, deformation and fracture behaviour at300 °C under asymmetric cyclic loading. A series of fatigue tests are performed at 300 °C under asymmetric stress-controlledloading with different combinations of σm (60?80 MPa), σa (115?135 MPa) and ? (30?750 MPa/s). Deformation behaviourand microstructural changes under the influence of above parameters (σm, σa and ? ) are examined by transmission electronmicroscope. It is observed that plastic strain increases with rise in σm as well as σa and cyclic life is reduced; on the otherhand, with increase in ? accumulation of plastic strain decreases and fatigue life is enhanced. The results are correlated withmicrostructural changes and fracture behaviour of the material under different test conditions.

#Asymmetric cyclic loading #Plastic strain accumulation #Mean stress #Stress amplitude #Stress rate

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