Crushing behaviour of high temperature reactor coated fuel particles
Crushing behaviour of high temperature reactor coated fuel particles
复制标题
高温反应堆包覆燃料颗粒的破碎行为
DOI：
10.1016/0022-3115(76)90262-2
复制
发表时间：
1976
影响因子：
3.1
通讯作者：
S. Quickenden
中科院分区：
文献类型：
--
作者：
A. Briggs;R. Davidge;C. Padgett;S. Quickenden
本文详细研究了具有热解碳或碳化硅外涂层的高温反应堆燃料颗粒的破碎行为，并讨论了它们的失效机制，试图将破碎失效载荷与涂层强度联系起来，并为质量控制或性能评估提供一种简单、快速的测试技术。失效是由一系列机制以不同的顺序发生的，由赫兹裂纹引发。由于压碎试验载荷/挠度曲线中检测到的第一个事件不是赫兹裂纹的形成而是赫兹裂纹的扩展，因此压碎载荷不能与涂层强度相关；相反，它由外涂层的断裂表面能决定。因此，破碎测试不是测量颗粒涂层强度的合适技术。然而，通过测量接触表面的尺寸，可以应用赫兹接触理论对外涂层的杨氏模量进行可靠的估计。
This paper examines in detail the crushing behaviour of high-temperature reactor fuel particles with pyrolytic carbon or silicon carbide outer coatings and discusses their failure mechanisms, in an attempt to relate crushing failure loads to coating strengths, and provide a simple, quick testing technique for quality control or performance assessment. Failure occurs by a series of mechanisms, in varying sequence, initiated by Hertzian cracking. Because the first event detected in a crushing test load/deflection curve is not the formation but the propagation of the Hertzian crack, the crushing load cannot be related to the coating strength; instead, it is governed by the fracture surface energy of the outer coating. A crushing test is therefore not a suitable technique for measurement of the strength of particle coatings. However, through measurement of the size of the contact surface, reliable estimates of the Young's modulus of the outer coating can be made by application of the Hertz theory of contact.