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

页码：256 / 262

页数：7