PDF
Full
Outline
A large number of fission pores are generated in ceramic fuel under high burnup conditions, and the fission gas released into the crack cavity has a great influence on the crack propagation behavior. In this study, a dynamic crack propagation model under variable internal pressure is developed to address the dynamic cracking technique of the coupling effect between the internal pressure and crack propagation. The internal pressure in crack cavity varies with crack propagation, while the cracking behavior is simulta-neously affected by the pressure. The presented model is successfully applied to simulate the cracking behavior of ceramic fuel particles of high burnup structure, and the mechanical effect of fission gas release on crack propagation is studied. Based on the cohesive element, the crack initiation and propagation process are simulated, and the mechanical research method of gas release on crack propagation is established here. Furthermore, the effects of gas pressure on the crack initiation and propagation process in fuel particles are analyzed. The results show that the release of gas into the crack cavity can inhibit crack propagation based on gas pressure and crack geometry characteristics. For different initial gas pressures, the larger the initial gas pressure is, the longer the crack propagation length will be. The developed dynamic cracking simulation technique provides an analytical method and numerical foundation for accurately analyzing the failure of dispersion fuel meat. It also provides a method to study the coupling of load and crack propagation.
PDF
101
50
| 科 Family | 属数 Number of genus | 种数 Number of species | 占总种数比例 Percentage of total species (%) | 属 Genus | 种数 Number of species | 占总种数比例 Percentage of total species (%) |
|---|---|---|---|---|---|---|
| 鹅膏菌科Amanitaceae | 2 | 11 | 5.26 | 鹅膏菌属 Amanita | 10 | 4.78 |
| 小菇科 Mycenaceae | 2 | 12 | 5.74 | 丝盖伞属 Inocybe | 5 | 2.39 |
| 多孔菌科 Polyporaceae | 8 | 14 | 6.70 | 蜡蘑属 Laccaria | 5 | 2.39 |
| 红菇科 Russulaceae | 3 | 23 | 11.00 | 小皮伞属 Marasmius | 6 | 2.87 |
| 小菇属 Mycena | 11 | 5.26 | ||||
| 光柄菇属 Pluteus | 5 | 2.39 | ||||
| 红菇属 Russula | 17 | 8.13 | ||||
| 栓菌属 Trametes | 5 | 2.39 |
关闭全屏
No. 86 Xueyuan South Road, Haidian District, Beijing
010-62199257
qkjq@cast.org.cn
Copyright © 2025 China Association for Science and Technology. All rights reserved. For all open access content, the relevant licensing terms apply.
Sponsored by the Office of the Leading Group for Cybersecurity and Informatization of CAST, and supported by Science and Technology Review Publishing House
