Abstract:

In order to guarantee the performance of the first wall beryllium copper connection under the ITER operation, the high heat flux test (HHFT) should be taken to evaluate the effects of defects, and then determine the acceptable defect size. Aiming at such test, using enhanced heat load (EHF) first wall small module, the temperature field and elastic-plastic structural analysis have been taken to study the effects of Be/CuCrZr interface defects under the high heat flux test condition. Analysis results show that the location and the size of Be/CuCrZr interface defects have a direct impact on local elastic-plastic strain, which affects thermal fatigue performance of the module; the bigger the defects, the greater the influence; marginal type defects is greater than the influence of the center type defects.

Key words: ITER first wall, Interface defects, Thermal stress, Elastic-plastic structural analysis, High heat flux test

摘要：

为保障第一壁板铍/铜连接的性能满足ITER运行要求，需通过高热负荷疲劳试验评估缺陷的影响，确定可接受的缺陷尺寸、形状、位置等。针对该试验用增强热负荷(EHF)第一壁小模块，通过温度场及弹塑性结构分析，研究试验工况下铍/铜界面预制人工缺陷对模块性能的影响。分析结果表明，缺陷位置和尺寸都会对缺陷附近的弹塑性应变产生直接影响，从而影响模块的热疲劳性能；缺陷越大，影响范围越大；边缘型缺陷的影响远大于中心位置缺陷。

关键词: ITER第一壁, 界面缺陷, 热应力, 弹塑性结构分析, 高热负荷试验