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

Nuclear Materials and Energy

Ewald Werner¹  Muyuan Li¹  Jeong-Ha You² 

[1] Lehrstuhl für Werkstoffkunde und Werkstoffmechanik, Technische Universität München, Boltzmannstr.15, 85748 Garching, Germany;Max-Planck-Institut für Plasmaphysik, Boltzmannstr.2, 85748 Garching, Germany;

关键词: Extended finite element method;    Thermal shock experiments;    J-integral;    Cracking threshold;    Tungsten cracking;   

DOI  :  10.1016/j.nme.2014.10.001

来源: DOAJ

【 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 fracture mechanical analysis combined with 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/m2 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/m2 and above, and when the base temperature is higher than 600 °C, almost no cracks is predicted. The numerically predicted cracking behavior agrees in general with the experimental observations.

【 授权许可】

Unknown