2013 Far East Forum on Nondestructive Evaluation/Testing: New Technology and Application最新文献

{"title":"Research on the device of differential excitation type eddy current testing for metal defect detection","authors":"Minghe Cao, Weimin Zhang, W. Zeng, C. Chen","doi":"10.1109/FENDT.2013.6635547","DOIUrl":"https://doi.org/10.1109/FENDT.2013.6635547","url":null,"abstract":"A differential excitation type sensor is introduced based on the eddy current principle for detecting metal defects, to improve the detection performance of the sensor system by optimizing the circuit of detection system. Using Q235 specimen as the detection object, aiming to detect and analyze the cracks of different depth and width and then to study the influence of excitation frequency, excitation amplitude and lift-off on the results. The test results showed that the differential excitation type eddy current testing device can be used for detecting defects on metal with high sensitivity.","PeriodicalId":413995,"journal":{"name":"2013 Far East Forum on Nondestructive Evaluation/Testing: New Technology and Application","volume":"1 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2013-06-17","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"131172407","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 study on the nonclassical nonlinear effect of concretes with different mix rate","authors":"Lue Zhang, Xiaozhou Liu, Xiaohui Wang, Jie-hui Liu, Jian-jun Chen, X. Gong","doi":"10.1109/FENDT.2013.6635524","DOIUrl":"https://doi.org/10.1109/FENDT.2013.6635524","url":null,"abstract":"The mix rate of concrete has great influence on the strength of concrete. At present, research method on different mix rate of concrete is always mechanical rather than acoustical. Different mix rates have different porosities in concretes and their linear and nonlinear acoustic properties of concrete are also different. In this paper, the porosity, the linear and nonlinear acoustic properties such as sound velocity, harmonics, nonlinear frequency shift of the concrete samples are compared. And we explore the possibility of using the linear and nonlinear parameters to characterize the strength of concrete.","PeriodicalId":413995,"journal":{"name":"2013 Far East Forum on Nondestructive Evaluation/Testing: New Technology and Application","volume":"9 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2013-06-17","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"127104267","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":"Detection of plastic deformation of 304 austenitic stainless steel based on DC magnetization","authors":"Hongmei Li, Li Wang, Yong Li, Zhenmao Chen","doi":"10.1109/FENDT.2013.6635556","DOIUrl":"https://doi.org/10.1109/FENDT.2013.6635556","url":null,"abstract":"The quantitative evaluation of plastic deformation in 304 stainless steel based on DC magnetization means is experimentally studied in this paper. First, specimens of two different shapes are designed and fabricated with 304 stainless steel. Various tensile plastic deformations are introduced into the specimens, and the surface residual plastic strains of specimens are measured by using an optical strain measurement system. Second, the specimens with different residual strains are magnetized by using an electromagnetic magnet, and the residual magnetic fields of the damaged specimens are measured by using a fluxgate magnetometer. Finally, the amplitudes and their relation of the residual strain and the residual magnetic field of different specimens are extracted and investigated. It is found that the distribution of residual magnetic field can be use to distinguish the damage state in material of 304 stainless steel, and the amplitude of residual magnetic field increases with the amplitude of residual strain, which indicates a possibility to quantitatively evaluate the plastic deformation of 304 stainless steel through DC magnetization means.","PeriodicalId":413995,"journal":{"name":"2013 Far East Forum on Nondestructive Evaluation/Testing: New Technology and Application","volume":"1 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2013-06-17","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"127571026","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":"R & D to electromagnetic NDT in the German nuclear safety research program — Material characterization of ageing phenomena and online monitoring of fatigue and fracture-mechanical tests","authors":"G. Dobmann, C. Boller, H. Herrmann, I. Altpeter","doi":"10.1109/FENDT.2013.6635539","DOIUrl":"https://doi.org/10.1109/FENDT.2013.6635539","url":null,"abstract":"Obviously it is a fact: The nuclear energy technology worldwide was and still is an important driver for the development of NDT/NDE. This is true in Germany too. Concerning the most relevant task of NDT - detection, classification, and sizing of material irregularities (inhomogeneity, defects) the development of NDT technologies and methodologies like UT and imaging with phased array transducers or defect reconstruction algorithms like SAFT (synthetic aperture focusing technique) or ET of steam generator heat exchanger tubes with eddy current probes and multi-frequency approaches primarily were in the focus of R&D. However, in Germany there was also a strong demand to develop NDT for characterizing the materials of the nuclear components in their properties. The basic idea was to have NDT technology available for inservice inspection of primary circuit components which can characterize the microstructure as well as load-induced and residual stresses. The characterizing should be performed in terms of mechanical properties as hardness, strength like yield and tensile strength but also toughness properties like Charpy energy and fracture appearance transition temperature. Beginning in 1976 the 3MA Methodology (Micromagnetic, Multiparameter, Microstructure and Stress Analysis) was developed. 3MA has its basis in micromagnetic NDT techniques which are the measurement of magnetic Barkhausen noise, of the magnetic incremental permeability, of the eddy current impedance, the harmonic analysis of the magnetic tangential field strength, and the measurement of the dynamic or also called incremental magnetostriction. All of these techniques ask for a local magnetization in a hysteresis loop of the material under inspection and therefore 3MA can only be applied at ferromagnetic materials. The techniques collect information which is generated by interaction of Bloch walls with microstructural parameters (lattice defects as vacancies, dissolved atoms, dislocations, precipitations, grain and phase boundaries as well as stress fields). The magnetization processes utilized are reversible and irreversible. Therefore the information collected is divers and redundant which helps to enhance the statistical significance for prediction and tu suppress disturbance influences. 3MA was applied to characterize aging phenomena in pressure vessel and pipeline steels as thermal ageing and neutron degradation as well as material states when thermal ageing and low cycle fatigue were superimposed. In the case of characterizing material states of austenitic stainless steels it strongly depends on the chemical composition whether the material - for instance when exposed to mechanical static or cyclic loads - reacts localized with phase transformation to bcc α' martensite or not. The phase-transformed microstructure is ferromagnetic and therefore 3MA techniques can be applied. In all other cases UT is applied and - for instance a time-of-flight-measurement - is the tool to characte","PeriodicalId":413995,"journal":{"name":"2013 Far East Forum on Nondestructive Evaluation/Testing: New Technology and Application","volume":"117 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2013-06-17","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"117276203","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":"Single channel blind source separation for defect identification using Eddy Current Pulsed Thermography","authors":"B. Gao, L. Bai, Wai Lok Woo, G. Tian, Yuhua Cheng","doi":"10.1109/FENDT.2013.6635536","DOIUrl":"https://doi.org/10.1109/FENDT.2013.6635536","url":null,"abstract":"A single channel blind source separation is proposed to process the Eddy Current Pulsed Thermography (ECPT) image sequences. The proposed method enables the detection automatically extract valuable spatial and time patterns according to the whole transient response behavior without any training knowledge. In addition, it has the potential to automatically identify defect patterns and quantify the defects. In this study, both mathematical and physical models are discussed and linked. The basis of the selection of separated spatial and time patterns is also presented. In addition, a natural crack is applied to validate the proposed method.","PeriodicalId":413995,"journal":{"name":"2013 Far East Forum on Nondestructive Evaluation/Testing: New Technology and Application","volume":"24 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2013-06-17","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"124618558","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 coil parameters on transduction performance of unidirectional EMATs for Rayleigh wave","authors":"Xiaoyang Chen, Ri-liang Su, Heng Zhang, Shujuan Wang, G. Zhai","doi":"10.1109/FENDT.2013.6635546","DOIUrl":"https://doi.org/10.1109/FENDT.2013.6635546","url":null,"abstract":"Electromagnetic acoustic transducer (EMAT) for Rayleigh wave has been widely used as a promising tool for flaw detection of metal plates due to its advantages such as high sensitivity to surface defects and low attenuation. Recently, numerous studies have focused on the unidirectional EMAT for Rayleigh wave as it can overcome the disadvantages such as low signal-to-noise ratio and existence of unfavorable received signals of typical EMAT. Since the unidirectional EMAT has been designed based on the principle of wave interference, its performance is sensitive to the parameters of the coil. In order to fully explore the influence of coil dimensions on the transduction performance of a unidirectional EMAT, a 2-D time domain finite model is established based on the Lorentz force mechanism. Using the model, the influence of coils on the transduction performance of a unidirectional EMAT for Rayleigh wave has been discussed. Experiments have been carried out to verify the validity of that model.","PeriodicalId":413995,"journal":{"name":"2013 Far East Forum on Nondestructive Evaluation/Testing: New Technology and Application","volume":"63 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2013-06-17","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"133895330","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 acoustic emission characteristics of honeycomb sandwich composite in compression damage","authors":"Guanhua Wu, Siyi Liu, Wei Wu, P. Han","doi":"10.1109/FENDT.2013.6635561","DOIUrl":"https://doi.org/10.1109/FENDT.2013.6635561","url":null,"abstract":"According to stress damage acoustic emission signal of loading honeycomb sandwich composite, taking the destructive compression test. Analyzing mechanical properties of the honeycomb sandwich composite material compression, establishing the correlation diagram between load and acoustic emission signal; the distribution of each phase signal characteristic parameter is studied with statistics. Taking three times filtering based on each phase signal characteristics. With increasing the load under loading condition, the damage of composite material increases gradually. The whole process can be divided into four stages, the first stage, There is small amount of the acoustic emission signal and the signal is generally low; Secondly, the number of acoustic emission events are relatively small and stable with a small increasing in characterization of signal; Thirdly, acoustic emission events grows suddenly, the average energy released by it increases; Fourthly, there will be arising a large number of signal which characteristic parameter is large. The experimental results show that it is effective to analyze the material damage and its evolution based on the analysis of acoustic emission parameter in compression process. There are coincides between the actual fracture location and the signal distribution obtained after filtering which is based on the characteristics of each phase parameters. The paper can provide reference for damage forecast and health monitoring of honeycomb sandwich composite.","PeriodicalId":413995,"journal":{"name":"2013 Far East Forum on Nondestructive Evaluation/Testing: New Technology and Application","volume":"7 Suppl 3 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2013-06-17","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"114477644","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":"Electromagnetic system for nondestructive evaluation of train hollow axles","authors":"T. Chady, G. Psuj, J. Kowalczyk, I. Spychalski","doi":"10.1109/FENDT.2013.6635523","DOIUrl":"https://doi.org/10.1109/FENDT.2013.6635523","url":null,"abstract":"The structural integrity of train axles is one of the important factors for safety precautions in a railway industry. Most common techniques used nowadays in the railway industry for manual inspection are visual and magnetic particle techniques as well as ultrasound testing. In this paper, a novel system for electromagnetic inspection is proposed to meet the aforementioned requirements. The system consists of two subsystems and transducers dedicated for flux leakage and eddy current method. Results of measurements and evaluation of the transducers are provided.","PeriodicalId":413995,"journal":{"name":"2013 Far East Forum on Nondestructive Evaluation/Testing: New Technology and Application","volume":"41 41","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2013-06-17","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"133783714","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":"Ultrasonic inspection of complex composites","authors":"Hongbo Wang, Chunguang Xu, Yao Xu","doi":"10.1109/FENDT.2013.6635530","DOIUrl":"https://doi.org/10.1109/FENDT.2013.6635530","url":null,"abstract":"Complex composites are widely used in aerospace, automobile industry and other fields. Because parts of complex surface to be detected are usually parts with variable thickness. After analyzing the disadvantages of current testing method, an improved real-time sensitivity adjusting method based on stable amplitude is presented. Part curvatures (convex and concave) have a significant effect on both the ultrasonic response and the scanning resolution requirements. In order to ensure more ultrasonic signals transmitted through composites, transducer should always automatically follow the changing shape of curved surface. A twin-robot testing system is introduced to accomplish testing complex surface automatically. Moreover, the experimental results of testing different complex composites supported the opinion above.","PeriodicalId":413995,"journal":{"name":"2013 Far East Forum on Nondestructive Evaluation/Testing: New Technology and Application","volume":"40 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2013-06-17","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"133804960","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":"Experimental study of alternating current stress measurement under a uniaxial stress","authors":"S. Ren, W. Fan, Ruiqi Zhou, Bing Li","doi":"10.1109/FENDT.2013.6635538","DOIUrl":"https://doi.org/10.1109/FENDT.2013.6635538","url":null,"abstract":"The alternating current stress measurement (ACSM) which is developed from alternating current field measurement(ACFM) is a new and effective electromagnetic non-destructive testing method with greatly application potential for stress measurement. Using this technology to detect the magnetic field disturbance on the specimen caused by the stress can realize the assessment for the degree of stress concentration. In the present paper, the relationship of stress and induced magnetic field was studied by tensile experiments of 20# low carbon steel. Experiment results which are extremely valuable show when the tensile force is less than the yield strength of the specimen, the percentage change of testing signal in the vertical direction of stress can be up to 8% and higher than that in the parallel direction. When the tensile force increases from 0kN to 40 kN, which can exceed the yield strength, the percentage change of testing signal in the vertical direction increases dramatically and can be up to 26%, while that in the parallel direction can be up to 23% too, which can effectively detect the degree of stress concentration of the ferromagnetic specimen. Meanwhile, a mathematical model of the relationship between stress and induced magnetic field was builded under the external magnetic field according to the principle of ferromagnetics, which can provide a reasonable interpretation for experiments.","PeriodicalId":413995,"journal":{"name":"2013 Far East Forum on Nondestructive Evaluation/Testing: New Technology and Application","volume":"68 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2013-06-17","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"127248018","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}