Flow stress prediction of zircaloy-4 at elevated temperatures using KHL constitutive model

Limbadri, K.; Kurra, S.; Singh, S.K.; Limbadri, K; Kurra, S; Singh, S.K

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Flow stress prediction of zircaloy-4 at elevated temperatures using KHL constitutive model

Limbadri, K.; Kurra, S.; Singh, S.K.

Advances in Materials and Processing Technologies 6(2): 362-371

2020

ISSN/ISBN: 2374-068X

Accession: 102710440

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Summary

Zircaloy-4 is widely used material for nuclear and high-temperature applications. This paper focuses on prediction of zircaloy-4 material flow stress at elevated temperatures using Khan-Huang-Liang (KHL) model. Three different routes of zircaloy-4 material namely low oxygen sheet, slab route sheet and tube route sheet are used for the experimental work. Uni-axial tensile tests are conducted at temperature range of 298–498K and at different strain rates of 0.001s−1, 0.005s−1 and 0.01s−1. The tensile test data has been used to predict the constants in KHL model for three different grades of zircaloy-4 material. The predicted flow stress with KHL model is compared with the experimental flow stress to check the accuracy of the model. The accuracy of model is also checked with statistical parameters such as correlation coefficient, average absolute error and root mean square standard deviation. This result reveal that the KHL model predicted flow stress is in good agreement with experimental flow stress data.