Fracture modes of ITER tungsten divertor monoblock under stationary thermal loads

被引：41
|
作者：
Panayotis, S. [1 ]
Hirai, T. [1 ]
Barabash, V. [1 ]
Amzallag, C. [2 ]
Escourbiac, F. [1 ]
Durocher, A. [1 ]
Komarov, V. [1 ]
Martinez, J. M. [1 ]
Merola, M. [1 ]
机构：
[1] ITER Org, Route Vinon Sur Verdon,CS 90 046, F-13067 St Paul Les Durance, France
[2] 35 Cours Fauriel, F-42100 St Etienne, France
来源：
FUSION ENGINEERING AND DESIGN | 2017年 / 125卷
关键词：
Fracture; Tungsten; ITER; Finite element; Divertor; High heat flux; PLASMA-FACING COMPONENTS;
D O I：
10.1016/j.fusengdes.2017.08.009
中图分类号：
TL [原子能技术]; O571 [原子核物理学];
学科分类号：
0827 ; 082701 ;
摘要：
During the qualification program of the tungsten divertor vertical targets, the tested mock-ups (250 tested tungsten monoblocks in total) successfully demonstrate their thermal performances and structural integrity. However, some of the tested monoblocks, in average 30%, showed macro-cracks in the tungsten. This paper presents the results of 3D elastic-plastic thermo-mechanical analysis of the tungsten monoblock under stationary thermal loads for two cases of tungsten material properties: (1) stress-relieved and (2) recrystallized. The comparison pointed out that the recrystallized tungsten monoblock accumulated more damages at the loaded than stress-relieved tungsten. In addition, recrystallization may lead to early development of cracks on the monoblock either due to progressive deformation or fatigue while the non-recrystallized monoblock has a much smaller probability to develop cracks, as long as the exposed surfaces are free from defects.
引用
收藏
页码：256 / 262
页数：7
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