Mechanical behaviors of the dispersion nuclear fuel plates induced by fuel particle swelling and thermal effect II: Effects of variations of the fuel particle diameters

作者：Ding Shurong^*; Wang Qiming; Huo Yongzhong

来源：Journal of Nuclear Materials, 2010, 397(1-3): 80-91.

DOI：10.1016/j.jnucmat.2009.12.012

In order to predict the irradiation mechanical behaviors of plate-type dispersion nuclear fuel elements, the total bumup is divided into two stages: the initial stage and the increasing stage. At the initial stage, the thermal effects induced by the high temperature differences between the operation temperatures and the room temperature are mainly considered: and at the increasing stage, the intense mechanical interactions between the fuel particles and the matrix due to the irradiation swelling of fuel particles are focused on. The large-deformation thermo-elasto-plasticity finite element analysis is performed to evaluate the effects of particle diameters oil the in-pile mechanical behaviors of fuel elements. The research results indicate that: (1) the maximum Mises stresses and equivalent plastic strains at the matrix increase with the fuel particle diameters: the effects of particle diameters on the maximum first principal stresses vary with bumup, and the considered case with the largest particle diameter holds the Maximum values all along: (2) at the cladding near the interface between the fuel meat and the cladding, the Mises stresses and the first principal stresses undergo major changes with increasing bumup, and different variations exist for different particle diameter cases; (3) the maximum Mises Stresses at the fuel particles rise with the particle diameters.

• 出版日期2010-2
• 单位复旦大学