Cracking behavior of tungsten armor under ELM-like thermal shock loads: A computational study

被引：37
作者：
Li, Muyuan [1 ]
Werner, Ewald [1 ]
You, Jeong-Ha [2 ]
机构：
[1] Tech Univ Munich, Lehrstuhl Werkstoffkunde & Werkstoffmech, D-85748 Garching, Germany
[2] Max Planck Inst Plasma Phys, Boltzmannstr 2, D-85748 Garching, Germany
来源：
NUCLEAR MATERIALS AND ENERGY | 2015年 / 2卷
关键词：
Extended finite element method; Thermal shock experiments; J-integral; Cracking threshold; Tungsten cracking;
D O I：
10.1016/j.nme.2014.10.001
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：
In this work, the cracking behavior of tungsten under edge-localized mode (ELM)-like thermal shock loads was investigated on the basis of a rigorous computational fracturemechanical analysis combinedwith the finite element method. Typical transient thermal shock loads of ELM conditions were considered with a relevant range of power density and base temperature for a loading duration of 1 ms. Crack initiation and progressive growth were predicted using the extended finite element method and the J-integral was calculated for the assumed precrack by means of the virtual crack extension method. For a power density of 1 GW/m(2) and higher, a crack is preferably initiated near the edge of the loading area and is then followed by a gradual horizontal kinking, parallel to the loading surface. The crack formation is predicted for the power density of 0.6 GW/m(2) and above, and when the base temperature is higher than 600 degrees C, almost no cracks is predicted. The numerically predicted cracking behavior agrees in general with the experimental observations. (C) 2014 The Authors. Published by Elsevier Ltd.
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页码：1 / 11
页数：11
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