Cracking behavior of tungsten armor under ELM-like thermal shock loads: A computational study
Cracking behavior of tungsten armor under ELM-like thermal shock loads: A computational study
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DOI：
10.1016/j.nme.2014.10.001
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发表时间：
2015-03-01
影响因子：
2.6
通讯作者：
You, Jeong-Ha
中科院分区：
文献类型：
--
作者：
Li, Muyuan;Werner, Ewald;You, Jeong-Ha
在严格计算断裂力学分析的基础上，结合有限元方法，研究了钨在类边缘局域模式(ELM)热冲击载荷下的开裂行为。考虑了ELM条件下典型的瞬时热冲击载荷，在相应的功率密度和基面温度范围内，加载时间为1ms。用扩展有限元方法对裂纹的萌生和扩展进行了预测，并用虚裂纹扩展方法计算了假设预裂纹处的J积分。对于1GW/m(2)或更高的功率密度，裂纹最好是在加载区边缘附近开始，然后是平行于加载面的逐渐水平扭结。当功率密度为0.6GW/m(2)及以上时，预测了裂纹的形成，当基点温度高于600℃时，几乎没有预测到裂纹。数值预测的裂化行为与实验结果基本一致。(C)2014年提交人。爱思唯尔有限公司出版。
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.