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掌握因表面缺陷而引起的疲劳开裂的扩展进程是核能发电设备的疲劳寿命评价的重要课题。为此,日本核能研究所在以前直管试验的基础上,制作了弯管试件并采用超声
It is an important subject to evaluate the fatigue life of nuclear power generation equipment by grasping the progress of fatigue cracking caused by surface defects. To this end, Japan Nuclear Research Institute in the previous straight-tube test based on the production of the elbow test specimens and the use of ultrasound