摘要
针对传统的涡流检测探头难以检测L型铝合金构件R角区域裂纹问题,研制了铝合金裂纹涡流检测探头。根据现场检测工况,设计了与R角区域有效贴合的探头外壳,并且结合R角区域裂纹的分布特点,提出了适用于检测铝合金表面及近表面裂纹的绝对式探头;通过ANSYS仿真软件建立涡流检测有限元模型,分析激励频率对涡流场强度分布的影响规律;进行了检测工艺参数的优化试验,确定了最佳激励参数。仿真和试验结果表明,激励频率与涡流场强度、信号幅值之间的整体变化规律一致;在200kHz激励频率下,信号幅值与裂纹深度之间存在良好的线性关系;现场检测结果和原位金相分析结果证实了所研制铝合金裂纹涡流检测探头的有效性和可靠性。
A high-sensitivity eddy current testing probe is designed and developed to detect the R-Angle cracks of L-type aluminum alloy components for complexity that is difficult to be detected by the traditional eddy current probe.The probe shell that effectively fits in the R-Angle region was designed according to field test condition.The absolute probe was proposed to detect the on-surface and near-surface cracks of aluminum alloy based on the dis tribution characteristics of the cracks in R-Angle region.Moreover,a three-dimentional finite element model of eddy current testing was established by ANSYS emulation software to analyze the influence law of excitation frequency on the intensity distribution of eddy current field.And tests were carried out to optimize the dection process parameters,which is to determine the optimal excitation parameters.Simulation and test results show that the overall varia tion law between exicitation frequency and eddy current field intensity is consistent with that between excitation frequency and amplitude of induced volt age.Furthermore,there is a good linear relationship between the amplitude of induced voltage and crack depth at the excitation frequency of 200 kHz.In addition,field test results and in-situ metallographic analysis confirm the validity and reliability of the eddy current detecion probe for cracks in alumi num alloy components.
作者
邓鸿剑
周庆祥
李广凯
邱国云
Deng Hongjian;Zhou Qingxiang;Li Guangkai;Qiu Guoyun(CRRC Qingdao Sifang Co.,Ltd.,Qingdao 266 111,China)
出处
《轻金属》
北大核心
2019年第6期50-54,共5页
Light Metals
基金
国家自然科学基金(51865033)
关键词
涡流检測
探头设计
铝合金构件
R角
裂纹
eddy current testing
probe design
aluminum alloy components
R Angle
crack
