Material property correlations for uranium mononitride II. Mechanical properties Academic Article uri icon

abstract

  • 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. © 1990.

author list (cited authors)

  • Hayes, S. L., Thomas, J. K., & Peddicord, K. L.

citation count

  • 41

complete list of authors

  • Hayes, SL||Thomas, JK||Peddicord, KL

publication date

  • May 1990