Effect of Ratcheting on Tensile Behavior of Zircaloy-2 at Room Temperature

Asymmetric cyclic loading, known as ratcheting fatigue, causes accumulation of cyclic plastic strain and reduces fatigue life of components. This investigation was undertaken to examine the effect of pre-ratcheting on tensile properties of the Zircaloy-2. Stress controlled fatigue tests were perform...

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Bibliographic Details
Published in:Transactions of the Indian Institute of Metals 2018-05, Vol.71 (5), p.1149-1160
Main Authors: Rajpurohit, R. S., Santhi Srinivas, N. C., Singh, S. R., Singh, V.
Format: Article
Language:English
Subjects:
Chemistry and Materials Science
Corrosion and Coatings
Cyclic loads
Deformation
Fatigue life
Fatigue tests
Life assessment
Materials fatigue
Materials Science
Metallic Materials
Parameters
Plastic deformation
Ratcheting
Room temperature
Serrated yielding
Stresses
Technical Paper
Tensile properties
Tensile strength
Tribology
Work hardening
Zircaloys (trademark)
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Summary:Asymmetric cyclic loading, known as ratcheting fatigue, causes accumulation of cyclic plastic strain and reduces fatigue life of components. This investigation was undertaken to examine the effect of pre-ratcheting on tensile properties of the Zircaloy-2. Stress controlled fatigue tests were performed at room temperature (RT) for 200 cycles with different combinations of the parameters: mean stress (σ m ), stress amplitude (σ a ) and stress rate ( σ ˙ ). Tensile properties of these samples were evaluated at room temperature. There was marked increase in the yield strength but there was far less effect on the tensile strength. The ductility was reduced due to prior ratcheting. The results have been discussed in terms of work hardening under different combinations of the ratcheting parameters.
ISSN:0972-2815
0975-1645
DOI:10.1007/s12666-017-1251-2