2020 IEEE Far East NDT New Technology & Application Forum (FENDT)最新文献

{"title":"Design of a portable ultrasonic testing system for CNG gas storage wells","authors":"Xiao-Dan Xu, Kai Zheng, Zhenhua Guo, Jin Wang, Hai-Tao Wang, W. Song, Yi Ren, Chun-Xiong Ding Jun-hua HE","doi":"10.1109/FENDT50467.2020.9337524","DOIUrl":"https://doi.org/10.1109/FENDT50467.2020.9337524","url":null,"abstract":"As a gas storage method with high efficiency, easy operation and economical rationality, CNG gas storage wells are widely used in fuel supply facilities such as gas stations and gas companies. However, gas storage wells are susceptible to the alternating loads of groundwater and high-pressure natural gas in the wells, which is likely to cause damage defects, leading to major casualties and property losses. Therefore, a portable ultrasonic testing system for CNG gas storage wells is proposed in this paper. The method of central reflection rotation is used in the system to measure the metal thickness of the wall of gas storage wells, which combines the water layer coupling in wells and the principle of ultrasonic detection. Computerized management of the whole process of gas storage well detection is realized. All the links of detection could be managed independently and various management data of gas storage wells is also detected in real time. In the end, the validation experiment of the system is carried out in the gas storage wells. The results show that this system related in this paper can automatically detect the metal thickness of the gas storage pipe wall, and solve the problems of gas storage leakage detection and deep well inspection.","PeriodicalId":302672,"journal":{"name":"2020 IEEE Far East NDT New Technology & Application Forum (FENDT)","volume":"27 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2020-11-20","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"114802204","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Nondestructive Evaluation of Microstructure Degradation of Pearlitic Steel","authors":"Jun Chen, S. Jin, Dan Qiao","doi":"10.1109/fendt50467.2020.9337527","DOIUrl":"https://doi.org/10.1109/fendt50467.2020.9337527","url":null,"abstract":"Pearlite spheroidization is the common form for the structural deterioration of pearlitic steel. The excessive pearlite spheroidization induces the serious decline in the mechanical properties of material and the change of ultrasonic parameters. Different heat treatment processes were applied to T8 steel samples for obtaining the pearlite structure in different spheroidized states with measurement of the corresponding longitudinal wave velocity, attenuation coefficient and nonlinear parameters. The experimental results showed that the normalized nonlinear parameter enhanced with the increment of pearlite spheroidization, while the longitudinal wave velocity and attenuation coefficient had no significant changes.","PeriodicalId":302672,"journal":{"name":"2020 IEEE Far East NDT New Technology & Application Forum (FENDT)","volume":"122 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2020-11-20","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"114332997","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"The Research of Steam Generator Thermal Performance Degradation in Nuclear Power Plant","authors":"Qing-Sen Zhao, Ying-Jie Chu, W. Luo, Wei-rang Wu, Yuying Kong","doi":"10.1109/fendt50467.2020.9337519","DOIUrl":"https://doi.org/10.1109/fendt50467.2020.9337519","url":null,"abstract":"As with any heat exchanger, the function of a nuclear steam generator is compromised by operational changes that increase the resistance to heat transfer between the primary and secondary fluids, lowering the efficiency and leading to thermal performance degradation. This type of performance degradation, the underlying causes, industry experience, and plant operational consequences had been discussed by ERRI and DEI reference documentations. After 6–10 years operation the steam pressure degradation of most plants occurred. The steam pressure of steam generator (SG) in Ningde nuclear power plant (NPP) decreased after the unit was in commercial operation. It decreased by 1 bar in first fuel cycle, and it was down by 0.5 bar at the second and third cycle. And the same type of nuclear power plant in France had no similar status. It was also different with the situations of American units. In this paper it concludes that the main cause of steam pressure loss is the sludge or fouling which accumulated at tubes and supporting plates at the second loop. The eddy current imaging and video inspection results showed that the sludge or deposit were found at the cold side tubes nearby the tube supporting plate one, the sludge amount at hot side tubes was smaller than the cold tubes. In general, there were no deposit signals at the upper tube bundle. And the total amount of sludge on SG tubes was fewer, which was possibly contradiction with the fouling factor. The bundle flushes equipment have been applied at Ningde NPP unit 1, the sludge amount was five times larger than the normal tube sheet flush. This special bundle flush applications reduce the sludge in the SGs, avoid the corrosion of heat transfer tubes and ensure the SGs safety. It is a pity that the SG thermal performance was not recovered quickly after this special flush. The sludge nearby the TSP1 was not the main cause of steam pressure loss. At present, the project team is studying polyacrylic acid (PAA) and chemical cleaning to expand the scope of washing and cleaning effect, and further recover the thermal performance of steam generator.","PeriodicalId":302672,"journal":{"name":"2020 IEEE Far East NDT New Technology & Application Forum (FENDT)","volume":"1 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2020-11-20","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"130902593","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Research on the Optimal Guided Wave Modes for the Detection of Delamination Defects","authors":"Xiao-dan Hu, Shi-yuan Zhou, Ming-Hua Zhao, Peng-jiao Yao, Quanpeng Yu, Chunguang Xu","doi":"10.1109/fendt50467.2020.9337522","DOIUrl":"https://doi.org/10.1109/fendt50467.2020.9337522","url":null,"abstract":"Carbon fiber composite has good material properties, but it is easy to cause defects during the process of preparation and performance. Delamination is one of the main forms of failure, which directly affects the safety of the material. Due to the dispersion and multimodality of ultrasonic guided waves, it is necessary to select sensitive modes for defect detection. In this paper, firstly, the dispersion curve and wave structures are calculated by semi analytical finite element method. Then the finite element simulation model in the frequency domain is established by COMSOL. The mode-frequency points with better detection effect are selected by analyzing the displacement changes, and the frequency sweep experiment is carried out to verify the simulation result. The result shows that mode 4 at 480kHz is suitable for the detection and identification of the delamination defects with different sizes.","PeriodicalId":302672,"journal":{"name":"2020 IEEE Far East NDT New Technology & Application Forum (FENDT)","volume":"25 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2020-11-20","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"133363620","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Dispersion characteristic of surface acoustic waves propagating through aluminum alloy heated by millisecond laser","authors":"Xi'an Liu, Z. Shen, Alexy.M. Lomonsov, Chenyin Ni, Ling Yuan, Weiwei Kan","doi":"10.1109/fendt50467.2020.9337533","DOIUrl":"https://doi.org/10.1109/fendt50467.2020.9337533","url":null,"abstract":"Surface acoustic waves(SAWs) exist dispersion when they propagate along material with elastic properties distributing heterogeneously over depth among near-surface area, and the dispersion spectrum can be applied to reconstruct elastic properties' distribution. A millisecond laser was assembled to heat aluminum alloy, resulting in a temperature gradient over depth in sample. As temperature dependence elastic properties distributing heterogeneously over depth because of the temperature gradient, SAWs will disperse when propagate across laser irradiated area, and materials' temperature dependence elastic properties can be obtained by analyzing the dispersion curve. Dispersion characteristic of laser-generated surface acoustic waves propagating along aluminum alloy with a temperature gradient near subsurface induced by millisecond laser irradiation was studied experimentally. The dispersion effects induced by surface roughness was removed by measuring the dispersion of SAWs propagating along the sample with millisecond irradiation and without it. The experimental data showed that heterogeneous distribution of elastic properties induced by the temperature can lead SAWs dispersing normally. Theoretical model based on effective velocity method was established to calculate the dispersion curve. Theoretical results agreed well with the experiment data. It was shown from experimental and theoretical results that temperature gradient formed by millisecond laser irradiation in aluminum alloy with surface temperature being 154°C can induce about 65m/s SAWs velocity shift at 35MHz.Experimental and theoretical results demonstrate the feasibility of this SAWs dispersion technique cooperated with millisecond laser to study materials' temperature dependence mechanical properties. Results of this paper may provide theoretical and experimental basis for inversing materials' temperature dependence elastic properties.","PeriodicalId":302672,"journal":{"name":"2020 IEEE Far East NDT New Technology & Application Forum (FENDT)","volume":"74 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2020-11-20","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"127076964","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Effect of Stress and Temperature on Hall Coefficient in Two Nickel-base Superalloys","authors":"Zhaoyu Shao, Z. Fan","doi":"10.1109/FENDT50467.2020.9337550","DOIUrl":"https://doi.org/10.1109/FENDT50467.2020.9337550","url":null,"abstract":"This paper investigates the effect of stress and temperature on the Hall coefficient in two Nickel-base superalloys, Inconel 100 (IN100) and Rolls-Royce 1000 (RR1000). The promising result indicates the feasibility of exploiting this technology for residual stress measurement in surface-enhanced aircraft engine components. A highly precise measurement system has been established based on the modified alternating current potential drop (ACPD) method. It is capable of measuring the Hall coefficient nondestructively on 1 mm thick specimens with a measurement standard deviation of 0.03%. It is worth noting that the Hall coefficient is negative and decreases linearly with elastic tensile stress in both tested materials. The linear relationship between the Hall coefficient and temperature has also been established to compensate the temperature effect in future measurements.","PeriodicalId":302672,"journal":{"name":"2020 IEEE Far East NDT New Technology & Application Forum (FENDT)","volume":"24 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2020-11-20","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"126204260","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Influence of Quasi-Beta Heat Treatment on Acoustic Behaviors of Ultrasonic Inspection of TC4-DT Alloy","authors":"Xiang Gao, Sujun Wu, C. Tao","doi":"10.1109/FENDT50467.2020.9337536","DOIUrl":"https://doi.org/10.1109/FENDT50467.2020.9337536","url":null,"abstract":"The microstructure and microtexture of TC4-DT alloy before and after quasi-β heat treatment are investigated, as well as the influence on the acoustic behaviors of ultrasonic inspection. C-scan ultrasonic images are obtained to investigate the evolution of microstructure confirmed by metallography and electron backscatter diffraction (EBSD) analysis. Noise level and signal-to-noise ratio (SNR) of ultrasonic inspection are also quantitatively verified. The results show that when TC4-DT alloy undergoes quasi-β heat treatment, attenuation and scattering of acoustic energy is significantly different. During this process, the scattering mechanism of acoustic changes from Rayleigh scattering to Phase scattering, which is mainly controlled by the grain size. Under the same scattering mechanism with the uniform average grain size, however, the regions of a-phase crystallites with a certain orientation contribute to the scattering of the acoustic wave. This finding is helpful for estimating ultrasonic inspection ability of large components.","PeriodicalId":302672,"journal":{"name":"2020 IEEE Far East NDT New Technology & Application Forum (FENDT)","volume":"32 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2020-11-20","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"128117887","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"3D Reconstructing of Arbitrary Defects with Magnetic Flux Leakage Testing Signals","authors":"Hong-mei Li, Ran-Ran Huang, Chunping Zhao, Jia Yan, Yu Wang","doi":"10.1109/FENDT50467.2020.9337538","DOIUrl":"https://doi.org/10.1109/FENDT50467.2020.9337538","url":null,"abstract":"By detecting and processing the Magnetic Flux Leakage (MFL) signals to identify and estimate the defects in ferromagnetic materials or structures, for example, in the steel pipelines, the so called Magnetic Flux Leakage Testing (MFLT) technology has been widely used in industry. However, the existing MFLT technology is suitable for locating the defects and rough estimating their sizes based on enormous sample data, incapable to image their Three-Dimensional (3D) shapes and precise estimate their sizes, while the physical model associating the defect geometry details and the MFL signals were still unclear. In this study, (1) the effects of an actual 3D defect are taken into account by introducing a new concept, Depth Field over a surface, i.e., a matrix of loss of material on the testing surface of a structure; (2) the governing equations for the depth field and the MFL signals are derived; (3) an algorithm to reconstruct the 3D defect or the depth field based on the governing equations is developed. This new method does not require huge amount of pulling-test data for calibration purpose as the existing MFLT technology used in industry, and it has been verified via a series of tests with various defects of different shapes in pipelines, the results indicate it is valid for 3D defect reconstruction with high accuracy.","PeriodicalId":302672,"journal":{"name":"2020 IEEE Far East NDT New Technology & Application Forum (FENDT)","volume":"36 4 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2020-11-20","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"130551736","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Meander Line Coil EMAT Based on Spatial Pulse Compression for Rayleigh Waves","authors":"Chuan-liu Jiang, Zhan-peng Li, Shu-juan Wang, Sheng-Bin Wang, Ran Yang","doi":"10.1109/fendt50467.2020.9337551","DOIUrl":"https://doi.org/10.1109/fendt50467.2020.9337551","url":null,"abstract":"Electromagnetic acoustic transducer (EMAT) has been applied to generate Rayleigh waves, for evaluating the surface and near-surface quality of a sample. The main disadvantages of EMAT are their low coupling efficiency and signal to noise ratio (SNR). Pulse compression technology is adopted to improve SNR, which designing a designed excitation waveform and corresponding a matched filter. This paper presents new methods, called linear wavelength modulation (LWM) and nonlinear wavelength modulation (NLWM), to design Rayleigh wave EMAT. Different from traditional structure, it used non-equidistant meander line coils, which based on spatial pulse compression. A finite element model is established to prove the new structure can excite wave packets with designed spatial wavelength distribution. The feasibility of spatial pulse compression and the effectiveness of the new method are proved by the simulation and experiments.","PeriodicalId":302672,"journal":{"name":"2020 IEEE Far East NDT New Technology & Application Forum (FENDT)","volume":"1 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2020-11-20","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"114797683","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Occlusion Area Removal in Binocular 3D Reconstruction of Train Running Parts","authors":"Zijian Bai, Kai Yang, Jin-long Li, Hao Sui","doi":"10.1109/fendt50467.2020.9337529","DOIUrl":"https://doi.org/10.1109/fendt50467.2020.9337529","url":null,"abstract":"The state-of-the-art approaches of stereo matching rely on trained CNNs. However, there are not proposed effective methods in the current end-to-end deep learning stereo matching network to solve the problem that a pair of rectified stereo images are matched in the occlusions and background areas, which leading to erroneous reconstruction of 3D point clouds in these areas. In this paper, a softmax module to the back-end of the stereo matching network is added to calculate the confidence of the disparity map. Moreover, the occlusion part and the background part of the disparity map is removed according to the characteristic that the correct area and the occlusion area have a morphological difference on the waveform of the confidence response. Finally, a train running parts dataset is generated to prove our method. This work realizes the rapid three-dimensional reconstruction and measurement of the bottom part of the motor car under the single image acquisition, and providing a feasible solution for removing the occlusion and background parts in stereo matching.","PeriodicalId":302672,"journal":{"name":"2020 IEEE Far East NDT New Technology & Application Forum (FENDT)","volume":"21 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2020-11-20","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"117124195","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}