核反应堆厚壁压力容器焊缝TOFD检测缺陷高度分辨率探究  

Inquiry of Height Resolution of Heavy Walled Nuclear Reactor Pressure Vessels in TOFD Testing

作　　者：张树潇 谢雪[1] 刘丽丽 罗忠兵[1] 杨会敏 张东辉 林莉[1] 张贵锋[1] 

机构地区：[1]大连理工大学材料科学与工程学院,辽宁大连116024 [2]核工业工程研究设计有限公司,北京101601

出　　处：《压力容器》2014年第6期64-69,共6页Pressure Vessel Technology

基　　金：十二五国防技术基础科研项目(Z0220120001)

摘　　要：对壁厚220 mm的核反应堆压力容器焊缝超声衍射时差法(TOFD)检测中缺陷高度分辨率进行理论分析,绘制了缺陷高度分辨率随缺陷埋深变化的函数曲线。当缺陷高度小于系统高度分辨率时,提出利用基于傅里叶变换的频谱分析法测算缺陷高度。3个侧通孔(埋深22.5 mm,3.0mm;埋深40.0 mm,2.0 mm;埋深80.0 mm,2.0 mm)的试验分析结果验证了该方法的有效性。进一步的数值计算结果表明,对埋深182.0 mm,2.0 mm侧通孔的TOFD检测信号进行频谱分析,能够准确确定缺陷高度。The height resolution of 220 mm thick nuclear reactor pressure vessels in TOFD （ time of flight diffraction,TOFD） testing was analyzed theoretically,and the function curve of height resolution changed with the buried depth was drawn. When the height of defect was smaller than the height resolution of sys-tem,a method based on spectrum analysis to size the height of a defect was proposed. The method′s effec-tiveness was validated by experiment on three side-drilled hole （22. 5 mm buried,Ф3. 0 mm;40. 0 mm buried,Ф2. 0 mm;80. 0 mm buried,Ф2. 0 mm）. The further numerical simulation result demonstrated that the height of a 182. 0 mm buried,Ф2. 0 mm side-drilled hole can be evaluated accurately by using the spectrum analysis method.

关 键 词：超声衍射时差法 缺陷 高度分辨率 频谱分析 

分 类 号：TH49[机械工程—机械制造及自动化] TL351[核科学技术—核技术及应用]