Stress Profile in Coating Layers of TRISO Fuel Particles in Contact with One Another
Stress Profile in Coating Layers of TRISO Fuel Particles in Contact with One Another
复制标题
相互接触的 TRISO 燃料颗粒涂层中的应力分布
DOI：
10.1080/00295639.2022.2090214
复制
发表时间：
2020
影响因子：
1.2
通讯作者：
K. Terrani
中科院分区：
文献类型：
--
作者：
D. Schappel;K. Terrani
摘要本文讨论了一系列的有限元分析，这些分析评估了三结构各向同性（TRISO）颗粒在嵌入基质中时相互接触的涂层中的应力演化。最初的模拟是施加单轴压力与基质弹性模量。这些模拟预测随着基质弹性模量的降低，TRISO颗粒的碳化硅涂层中的应力增加。第二组模拟集中在加热和冷却的影响以及涂层中应力状态的相关尺寸变化。一般的发现是，在涂层的沉积温度以下没有显著差异。然而，在沉积温度以上，接触的颗粒相比于分离的颗粒具有更高的应力。第三组模拟侧重于辐照的影响，具体而言，蠕变，尺寸变化和膨胀。引入了界面脱粘模型，因为这些潜在的影响有一个显着的轴承预测的应力。
Abstract This work presents a discussion on a series of finite element analyses that assess stress evolution in the coating layers of tristructural isotropic (TRISO) particles in contact with each other while embedded in a matrix. The initial simulations were of applied uniaxial pressure versus matrix elastic modulus. These simulations predicted increasing stress in the silicon carbide coating layers of the TRISO particles with decreasing matrix elastic modulus. The second set of simulations focused on the effects of heating and cooling and the associated dimensional change on the state of stress in the coating layers. The general finding was that there was no significant difference below the coating layer’s deposition temperature. However, above the deposition temperature, the contacting particles had higher stress compared with those that were separated. The third set of simulations focused on the effects of irradiation, specifically, creep, dimensional change, and swelling. An interface debonding model was introduced since these potential effects have a significant bearing on predicted stresses.