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Comparative Study of Flow Stress Modeling of Zircaloy-4 Sheets Manufactured from Different Routes


Affiliations
1 MLR Institute of Technology, Hyderabad 500 043, India
2 BITS Pilani, Hyderabad Campus, 500 078, India
3 Gokaraju Rangaraju Institute of Engineering and Technology, Hyderabad 500090, India
 

Zircaloy-4 is proven to be an excellent structural material in the nuclear industry. In the present work, three types of zircaloy-4 sheet materials are subjected to tensile tests at strain rates of 0.001s<sup>-1</sup>, 0.005s<sup>-1</sup>, 0.01s<sup>-1</sup>, and at four different temperatures of 298K(room temperature), 348K, 423K, and 498K. The tensile stress-strain data has been used to model the flow stress using three different constitutive models, namely the Johnson-Cook (JC) model, modified Zerilli-Armstrong (m-ZA), and modified Arrhenius (m-Arr) model. The models' prediction capability for all the materials is compared using the Coefficient of correlation (R), average absolute error (Δ), and the number of constants to be determined. It has resulted that the m-Arr model has high goodness of fit with a maximum R-value is 0.9950, and the minimum Δ is 1.1132% for Low Oxygen Sheet (LOS) material. It is also a suitable model for the other two zircaloy-4 materials, even though more constants are to be evaluated.

Keywords

Zircaloy-4, Johnson-Cook Model, Modified Zerilli-Armstrong, Modified Arrhenius, Coefficient of Correlation.
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  • Comparative Study of Flow Stress Modeling of Zircaloy-4 Sheets Manufactured from Different Routes

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Authors

Kanthi Limbadri
MLR Institute of Technology, Hyderabad 500 043, India
Kurra Suresh
BITS Pilani, Hyderabad Campus, 500 078, India
Swadesh Kumar Singh
Gokaraju Rangaraju Institute of Engineering and Technology, Hyderabad 500090, India

Abstract


Zircaloy-4 is proven to be an excellent structural material in the nuclear industry. In the present work, three types of zircaloy-4 sheet materials are subjected to tensile tests at strain rates of 0.001s<sup>-1</sup>, 0.005s<sup>-1</sup>, 0.01s<sup>-1</sup>, and at four different temperatures of 298K(room temperature), 348K, 423K, and 498K. The tensile stress-strain data has been used to model the flow stress using three different constitutive models, namely the Johnson-Cook (JC) model, modified Zerilli-Armstrong (m-ZA), and modified Arrhenius (m-Arr) model. The models' prediction capability for all the materials is compared using the Coefficient of correlation (R), average absolute error (Δ), and the number of constants to be determined. It has resulted that the m-Arr model has high goodness of fit with a maximum R-value is 0.9950, and the minimum Δ is 1.1132% for Low Oxygen Sheet (LOS) material. It is also a suitable model for the other two zircaloy-4 materials, even though more constants are to be evaluated.

Keywords


Zircaloy-4, Johnson-Cook Model, Modified Zerilli-Armstrong, Modified Arrhenius, Coefficient of Correlation.

References