The bonding mode of NITE-SiC matrix and TRISO particles has a great impact on the fracture mechanisms of the Fully Ceramic Microencapsulated (FCM) fuel. Combination strength and interface debonding characteristics are of great significance when evaluating the thermo-mechanical behavior of a FCM fuel. In this study, a finite element method (FEM) model for TRISO-matrix debonding characteristics analysis was presented based on the cohesive zone model (CZM). The CZM was coupled with several irradiation behaviors (burnup, fission gas release, gap/plenum pressure, etc.) and thermo-mechanical behaviors (irradiation-induced dimensional change (IIDC), contact, heat generation, conduction, gap heat transfer, thermal expansion, and creep etc.), and developed to investigate the interface debonding characteristics of TRISO coated FCM Fuel preliminarily. A 3-dimensional multiphysics modeling approach has been successfully applied to realize simulations of a representative FCM fuel unit, also a uniformly distributed FCM layer. The NITE-SiC and OPyC interface debonding characteristics model was well performed, and was validated with CZM theory. Moreover, the effects of burnup, particle spacing, stress distributions of matrix, interfacial bonding strength and other key parameters in CZM model, were studied and investigated.

NITE-SiC基体与TRISO颗粒的结合方式对全陶瓷微囊化（FCM）燃料的断裂机理有很大影响。当评估FCM燃料的热机械性能时，结合强度和界面剥离性能具有重要意义。在这项研究中，基于粘聚区模型（CZM），提出了一种用于TRISO-基体脱胶特性分析的有限元方法（FEM）模型。CZM与多种辐射行为（燃尽，裂变气体释放，气隙/增压压力等）和热机械行为（辐射诱发的尺寸变化（IIDC），接触，生热，传导，气隙传热，热力学行为）耦合。膨胀和蠕变等），并进行了初步研究以研究TRISO涂层FCM燃料的界面剥离性能。3维多物理场建模方法已成功应用于实现具有代表性的FCM燃料单元（也是均匀分布的FCM层）的仿真。NITE-SiC和OPyC界面剥离性能模型表现良好，并用CZM理论进行了验证。此外，研究了CZM模型中燃耗，颗粒间距，基体应力分布，界面结合强度以及其他关键参数的影响。