TY - JOUR

T1 - Material property correlations for uranium mononitride. II. Mechanical properties

AU - Hayes, S. L.

AU - Thomas, J. K.

AU - Peddicord, K. L.

N1 - Funding Information:
The work conductedb y the lead author was performed under appointmentt o the Nuclear Enpjneering and Health Physics Fellowship program administered by Oak Ridge AssociatedU niversities for the US De-partmento f Energy. The initial conceptf or the project was developedin conjunction with the LANL contract 9-X6D-1879G-1;t he majority of this work was directly funded by the DOE contract DE-ACO2-86NE3796O.A 000. The authors wish to thank Drs. D.L. McElroy (ORNL) and E.R. Storms (LANL) for their teclmical supporta nd guidance.

PY - 1990/5

Y1 - 1990/5

N2 - The experimental data for the creep rate (ε{lunate}'), Young's modulus (E), shear modulus (G), bulk modulus (K), Poisson's ratio (v), and hardness (HD) of uranium mononitride (UN) have been collected and reviewed. Empirical correlations for these properties as functions of temperature (T, in K), stress (s, in MPa), and density (D, % of theoretical) or porosity (P, volume fraction), were developed and are given as: ε{lunate}'(s-1) = 2.054 × 10-3σ4.5exp{ -39369.5 T}, E(MPa) = 0.258(D)3.002[1-2.375 × 10-5(T)], G(MPa) = 1.44 × 10-2(D)3.446[1-2.375 × 10-5(T)], K(MPa) = 1.33 × 10-3(D)4.074[1-2.375 × 10-5(T)], v = 1.26 × 10-3(D)1.174, HD(kg/mm2) = 951.8[1-2.1(P)] exp{-1.882 × 10-3(T)}. The creep rate correlation was constructed from theoretically dense experimental data in the range of 20 ≤ σ ≤ 34 MPa and 298 ≤ T ≤ 2523 K; a porosity correction factor for creep has been reported elsewhere. The elastic property correlations are valid for 70 ≤ D ≤ 100% and 298 ≤ T ≤ 1473 K, and the hardness correlation is valid for 0 ≤ P ≤ 0.26 and 298 ≤ T ≤ 1673 K. However, all of the correlation forms employed are stable and application of these correlations outside the experimental data limits should yield reasonable estimates for these properties.

AB - The experimental data for the creep rate (ε{lunate}'), Young's modulus (E), shear modulus (G), bulk modulus (K), Poisson's ratio (v), and hardness (HD) of uranium mononitride (UN) have been collected and reviewed. Empirical correlations for these properties as functions of temperature (T, in K), stress (s, in MPa), and density (D, % of theoretical) or porosity (P, volume fraction), were developed and are given as: ε{lunate}'(s-1) = 2.054 × 10-3σ4.5exp{ -39369.5 T}, E(MPa) = 0.258(D)3.002[1-2.375 × 10-5(T)], G(MPa) = 1.44 × 10-2(D)3.446[1-2.375 × 10-5(T)], K(MPa) = 1.33 × 10-3(D)4.074[1-2.375 × 10-5(T)], v = 1.26 × 10-3(D)1.174, HD(kg/mm2) = 951.8[1-2.1(P)] exp{-1.882 × 10-3(T)}. The creep rate correlation was constructed from theoretically dense experimental data in the range of 20 ≤ σ ≤ 34 MPa and 298 ≤ T ≤ 2523 K; a porosity correction factor for creep has been reported elsewhere. The elastic property correlations are valid for 70 ≤ D ≤ 100% and 298 ≤ T ≤ 1473 K, and the hardness correlation is valid for 0 ≤ P ≤ 0.26 and 298 ≤ T ≤ 1673 K. However, all of the correlation forms employed are stable and application of these correlations outside the experimental data limits should yield reasonable estimates for these properties.

UR - http://www.scopus.com/inward/record.url?scp=0025433713&partnerID=8YFLogxK

U2 - 10.1016/0022-3115(90)90375-W

DO - 10.1016/0022-3115(90)90375-W

M3 - Article

AN - SCOPUS:0025433713

SN - 0022-3115

VL - 171

SP - 271

EP - 288

JO - Journal of Nuclear Materials

JF - Journal of Nuclear Materials

IS - 2-3

ER -