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Low-Cycle Fatigue Behavior of Small Slice Specimens of Zircaloy-4 at Elevated Temperature

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Abstract:

A series of strain fatigue tests were carried out on small bugle-like slice-specimens of Zr-4 alloy at 20 and 400. According to Elastic and Plastic Finite Element Analysis  and assumption of local damage equivalence, a strain formula was given to transform transverse strain of the specimen to uniaxial strain. Based on the test results of the alloy and the strain transform formula, M-C (Manson-Coffin) models to be used for estimating uniaxial fatigue life of Zr-4 alloy were obtained. The results show that, the alloy mainly behaves as cyclic softening at 20 and as cyclic hardening at 400, and the elevated temperature can lead serious additional fatigue damage of the alloy and the effect of the elevated temperature impairs gradually with increasing of amplitude strain. A conclusion is helpful that prediction life by using M-C model based on traditional strain transform equation is quite conservative when uniaxial strain amplitude is less than 0.5%.

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Periodical:

Key Engineering Materials (Volumes 324-325)

Pages:

1241-1244

DOI:

https://doi.org/10.4028/www.scientific.net/KEM.324-325.1241

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Online since:

November 2006

Authors:

Li Xun Cai, Yu Ming Ye

Keywords:

Elevated Temperature, Finite Element Analysis (FEA), Life Estimation, Slice Specimen, Strain Equivalence, Strain Fatigue, Zircaloy

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© 2006 Trans Tech Publications Ltd. All Rights Reserved

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