PDF《第X卷第 X 期应用力学学报 Vol.XNo.X》

第X卷第 X 期应用力学学报 Vol.

XNo.X 201X 年X月CHINESE JOURNAL OF APPLIED MECHANICS XX.201X 基金项目:国家自然科学基金(51577139)收稿日期:******修回日期:****** 第一作者简介:赵迎松,女,1993 年生,西安交通大学航天航空学院,博士研究生;

研究方向――电磁无损检测. E-mail:zhaoys@stu.xjtu.edu.cn 通讯作者:陈振茂,男,1964 年生,博士,西安交通大学航天航空学院,教授;

研究方向――电磁无损检测. E-mail:chenzm@mail.xjtu.edu.cn 第X卷第 X 期仪器仪表学报 Vol.XNo.X 201X 年X月Chinese Journal of Scientific Instrument 第X卷第 X 期仪器仪表学报 Vol.XNo.X 201X 年X月Chinese Journal of Scientific Instrument 大型容器不锈钢衬厚度多频涡流无损评价方法 赵迎松

1 解社娟

1 蔡文路

1 李鹏

2 朱光艺

2 陈振茂 1* (1.陕西省无损检测与结构完整性评价工程中心,机械结构强度与振动国家重点实验室,西安交通大学, 西安 710049;

2.新疆维吾尔自治区特种设备检验研究院, 乌鲁木齐 830011) 摘要:为防止大型容器器壁腐蚀导致泄漏等事故,同时降低容器材料费用,许多石油化工等大型容器常采用不锈钢衬结构. 不锈钢衬厚度的有效评价是保障大型容器安全的关键之一.本文提出了一种基于多频涡流检测技术的大型容器不锈钢衬的厚 度无损评价方法,并开发了相应的实验系统,利用检测实验进行了有效性验证.所提方法基于多频涡流检测技术原理,利用 互感型涡流检测探头,基于新的信号特征量采用标定曲线方法实现钢衬厚度的有效定量无损评价.具体过程为,首先利用已 知厚度的钢衬标定试样,在给定激励频率情况下,基于所提多频涡流信号特征量建立钢衬厚度-信号特征量标定关系曲线;

其 次对实际检测对象待测点利用相同实验条件获取多频涡流检测信号并提取特征量;

最后基于标定曲线和检测信号特征量求取 钢衬厚度值.检测评价实验表明,本方法可对1.0mm至4.0mm以内的大型容器钢衬厚度进行有效评价. 关键词:大型碳钢容器;

不锈钢衬;

多频涡流检测;

厚度评价 中图分类号:TG115.28 文献标志码:A QNDEmethod for thicknessevaluationof stainless steel cladding layer ina large vessel based on multi-frequency ECT signals Yingsong Zhao

1 , ShejuanXie

1 , WenluCai

1 , Peng Li

2 , Guangyi Zhu

2 , Zhenmao Chen

1 (1. Shaanxi Engineering Research Center of NDT and Structural Integrity Evaluation, State KeyLaboratory for Strength and Vibration of Mechanical Structures, Xi'

an Jiaotong University, Xi'

an 710049, China;

2. Xinjiang Uygur Autonomous Region Inspection Institute of Special Equipment, Urumqi 830011, China) Abstract: In order to prevent leak accident due to corrosion of wall steel of large vessels widely used in petroleum and chemical industry, cladding layer of stainless steel is adopted in many practical large vessels. The quantitativenondestructiveevaluation(NDE) on the cladding layer thickness is the key for ensuring the integrity of the vessel structure. This paper proposes a new NDEmethod to evaluate the thickness of cladding layerin large carbon steel vessel by using theeddy current testing (ECT) technique. To realize the thickness evaluation, a calibration curve strategy is utilized with a Transmitter-Receiver type ECT probe and a new feature parameter ofmulti-frequency ECT signals. In practice, the correlation curve of cladding layer thickness versus signal feature parameterwas established experimentally at first by using amulti-frequency ECT system and vessel wall samples with cladding layer of different thickness. Then themulti-frequency signals at the evaluation point was measuredunderthe same inspection conditions with the calibration experiments, and the feature parameterwas extracted from the measured signalsat the same time. Finally, the thickness of stainless cladding layer at the measuring point can be evaluatedwith the value of feature parameter based on the obtained calibration curve. Experimental results indicate thatthe proposed method performs efficiently for quantitative evaluation of thickness of stainless steel cladding layer with itsthickness ranging from 1.0mm to 4.0mm. Keywords:large vessel of carbon steel;