Study on Reliability of Eddy Current Detection of Disc Crack by Transfer Function Method
WANG Jing1, PAN Zheng1, WANG Hongliang1, JIANG Shichao1, HUANG Zhouzhou2, SONG Kai2
1. State-Owned Wuhu Machinery Factory, Wuhu 241007, China;
2. Key Laboratory of Nondestructive Test of Ministry of Education, Nanchang Hangkong University, Nanchang 330063, China
摘要可靠性分析是定量评估无损检测技术有效性的核心手段。以航空发动机轮盘为检测对象,以涡流检测为试验方法,针对电火花刻槽无法有效表征真实构件中疲劳裂纹的问题,提出一种基于响应信号的传递函数方法。首先采用涡流检测方法定量获取平板试块的人工刻槽、疲劳裂纹缺陷及目标涡轮盘试块的人工刻槽缺陷信号,然后建立航空发动机轮盘平板试样人工刻槽缺陷与疲劳裂纹缺陷涡流检测数据间的传递函数,得出航空发动机轮盘疲劳裂纹涡流检测可靠性(Probability of detection,POD)曲线。研究结果表明,利用经验方法建立的刻槽与疲劳裂纹之间的传递函数,可在无法获得真实试样的情况下,计算得出涡流检测有效检出的航空发动机轮盘疲劳裂纹缺陷为1.88 mm×0.94 mm,为航空发动机轮盘损伤容限设计及检修计划安排提供了依据,对无损检测方法的应用可靠性研究具有重要指导意义。
Reliability analysis is a key means to quantitatively evaluate the effectiveness of nondestructive test technology. In order to solve the problem that EDM grooves can not effectively characterize fatigue cracks in real components, a transfer function method based on response signal is proposed. Firstly, this paper adopts eddy current detection method to quantitatively obtain the signals of manual grooving defects and fatigue crack defects of the flat plate test block and the signals of manual grooving defects of the target turbine disk test block. Then, according to the curve signals, the transfer function between the eddy current detection data of manual grooving defects and fatigue crack defects of the aero-engine wheel plate sample is established. The probability of detection (POD) curve of aero-engine wheel fatigue crack is obtained. The results show that: Under the condition that the real sample could not be obtained, this paper established the transfer function between grooving and fatigue crack by empirical method, and calculated that the fatigue crack defect of aero-engine wheel that can be effectively detected by eddy current testing is 1.88 mm×0.94 mm, which provides a basis for the design of aero-engine wheel damage tolerance and maintenance planning. It has important guiding significance to the application reliability research of nondestructive testing methods.
王静,潘峥,汪洪量,蒋诗超,黄周洲,宋凯. 轮盘裂纹涡流检测可靠性的传递函数方法研究[J]. 航空制造技术, 2022, 65(23/24): 124-132.
WANG Jing, PAN Zheng, WANG Hongliang, JIANG Shichao, HUANG Zhouzhou, SONG Kai. Study on Reliability of Eddy Current Detection of Disc Crack by Transfer Function Method[J]. Aeronautical Manufacturing Technology, 2022, 65(23/24): 124-132.