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  • 1
    Electronic Resource
    Electronic Resource
    Ultrasonic Characterization of Residual Stress in Shot Peened AI 7075 Alloy Using Acoustic Signature (2006)
    s.l. ; Stafa-Zurich, Switzerland
    Key engineering materials Vol. 321-323 (Oct. 2006), p. 1475-1478 
    Details
    ISSN: 1013-9826
    Source: Scientific.Net: Materials Science & Technology / Trans Tech Publications Archiv 1984-2008
    Topics: Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics
    Notes: We attempted to estimate the residual stress which evolved during the shot peening of Al7075 alloy using leaky surface acoustic wave (LSAW). Shot peening was conducted to produce avariation in the compressive residual stress with the depth from the surface at a shot velocity of 30m/s.The LSAW velocity was measured using a scanning acoustic microscopy (SAM). The Vickershardness profile obtained inwards from the surface showed significant work hardening of the nearsurface layer with a thickness of about 0.3mm. The variation in the LSAW velocity through the shotpeened surface layer was in good agreement with the distribution of the residual stress measured byX-ray diffraction
    Type of Medium: Electronic Resource
    URL: http://www.tib-hannover.de/fulltexts/2011/0528/01/52/transtech_doi~10.4028%252Fwww.scientific.net%252FKEM.321-323.1475.pdf
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  • 2
    Electronic Resource
    Electronic Resource
    Quantitative Evaluation of Strain Induced Martensite in STS 316L Stainless Steel (2006)
    s.l. ; Stafa-Zurich, Switzerland
    Key engineering materials Vol. 326-328 (Dec. 2006), p. 677-680 
    Details
    ISSN: 1013-9826
    Source: Scientific.Net: Materials Science & Technology / Trans Tech Publications Archiv 1984-2008
    Topics: Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics
    Notes: In the present work, the strain induced martensite in 316L stainless steel was quantitativelycharacterized by X-ray diffraction, the measurement of the magnetic coercivity and the AE techniqueduring the monotonic tensile deformation of plate specimens. Plate specimens subjected to differentheat treatments (i.e. having different initial microstructures) were tensile-deformed and the AE countsobtained during tensile deformation were correlated with the microstructural development. The AEcount was observed to increase with increasing amount of strain induced martensite phase, asdetermined by X-ray diffraction analysis. The potential of the AE technique and the measurement ofthe magnetic coercivity to be used for the evaluation of the tensile deformation was discussed inrelation to the existence of strain-induced martensite
    Type of Medium: Electronic Resource
    URL: http://www.tib-hannover.de/fulltexts/2011/0528/01/52/transtech_doi~10.4028%252Fwww.scientific.net%252FKEM.326-328.677.pdf
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  • 3
    Electronic Resource
    Electronic Resource
    A Non-Contact Guided Wave Technique for Defect Thinning Monitoring (2006)
    s.l. ; Stafa-Zurich, Switzerland
    Key engineering materials Vol. 326-328 (Dec. 2006), p. 681-684 
    Details
    ISSN: 1013-9826
    Source: Scientific.Net: Materials Science & Technology / Trans Tech Publications Archiv 1984-2008
    Topics: Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics
    Notes: This paper capitalizes on recent advances in the area of non-contact ultrasonic guided wavetechniques. The present technique provides a decent method for nondestructive testing of defectthinning simulating a hidden corrosion or FAC(Flow Accelerated Corrosion) in a thin aluminum plate.The proposed approach is based on using EMAT(Electro-magnetic Acoustic Transducer) to generateguided waves and detect the wall thinning without any coupling. Interesting features in the dispersivebehavior of selected guided modes are used for the detection of plate thinning. It is shown that modecut-off measurement allows us to monitor a defect thinning level while a group velocity change can beused to quantify the thinning depth
    Type of Medium: Electronic Resource
    URL: http://www.tib-hannover.de/fulltexts/2011/0528/01/52/transtech_doi~10.4028%252Fwww.scientific.net%252FKEM.326-328.681.pdf
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  • 4
    Electronic Resource
    Electronic Resource
    Application of Torsional Mode of Guided Waves to Long Range Pipe Inspection (2006)
    s.l. ; Stafa-Zurich, Switzerland
    Key engineering materials Vol. 326-328 (Dec. 2006), p. 473-476 
    Details
    ISSN: 1013-9826
    Source: Scientific.Net: Materials Science & Technology / Trans Tech Publications Archiv 1984-2008
    Topics: Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics
    Notes: Conventional non-destructive techniques for inspection of weld in pipelines requiresignificant test time and high cost. In order to overcome these drawbacks in conventional NDTtechniques, various techniques using ultrasonic guided waves have been developed and applied to thepipeline inspection. Recently, a fast calculation technique for guided wave propagation using asemi-analytical finite element method (SAFEM), PIPE WAVE ver.1.0, has been developed by T.Takahiro et al [1]. In this paper, the calculation of torsional mode propagation in a pipe using PIPEWAVE ver. 1.0 is introduced as a preliminary study and the application of the torsional mode ofultrasonic guided waves to long range pipe inspection is presented.. The characteristics and setup of along range guided wave inspection system and experimental results in pipes of various diameters areintroduced. The experimental results in mock-up pipes with cluster type detects show that the limit ofdetectable wall thickness reduction with this guided wave system is 2~3% in the pipe cross sectionarea and the wall thickness reduction of 5% in cross section area can be detected when actualdetection level is used. Therefore, the applicability of the ultrasonic guided wave technique to longrange pipeline inspection for wall thickness reduction is verified
    Type of Medium: Electronic Resource
    URL: http://www.tib-hannover.de/fulltexts/2011/0528/01/52/transtech_doi~10.4028%252Fwww.scientific.net%252FKEM.326-328.473.pdf
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  • 5
    Electronic Resource
    Electronic Resource
    Effect of Isothermal Aging on Magnetic Properties in 12Cr Steel (2006)
    s.l. ; Stafa-Zurich, Switzerland
    Key engineering materials Vol. 326-328 (Dec. 2006), p. 1201-1204 
    Details
    ISSN: 1013-9826
    Source: Scientific.Net: Materials Science & Technology / Trans Tech Publications Archiv 1984-2008
    Topics: Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics
    Notes: The magnetic coercivity of martensitic 12Cr steel was measured in order to evaluate itsdegree of isothermal aging. As the aging time increased, the lath width increased and the dislocationswere recovered. Aging resulted in the coarsening of the as-tempered carbides (M23C6 and MX)followed by additional precipitation of Fe2W. The magnetic coercivity rapidly decreased during theinitial aging period of about 1,000 hours and then decreased slightly thereafter. The decrease in thecoercivity with increasing aging time was related to the decrease in the number of pinning sites, thoseassociated with the dislocations, fine precipitates and coarsening of the martensite lath/subgrain
    Type of Medium: Electronic Resource
    URL: http://www.tib-hannover.de/fulltexts/2011/0528/01/52/transtech_doi~10.4028%252Fwww.scientific.net%252FKEM.326-328.1201.pdf
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  • 6
    Electronic Resource
    Electronic Resource
    Evaluation of Hidden Corrosion in a Thin Plate Using a Non-Contact Guided Wave Technique (2006)
    s.l. ; Stafa-Zurich, Switzerland
    Key engineering materials Vol. 321-323 (Oct. 2006), p. 492-496 
    Details
    ISSN: 1013-9826
    Source: Scientific.Net: Materials Science & Technology / Trans Tech Publications Archiv 1984-2008
    Topics: Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics
    Notes: In this paper, study on evaluation of thickness reduction in a thin plate with guided waves ispresented. Ultrasonic guided wave techniques have been widely studied and successfully applied tovarious non-destructive tests with the advantage of long range inspection. In addition to application ofguided waves to NDT, non-contact methods for ultrasonic wave generation and detection havebecome very useful and well combined with guided wave techniques due to their capability ofultrasonic wave generation and reception in surface of high temperature or on rough surface. Anadvanced non-contact technique for detection of thickness reduction simulating hidden corrosion inthin plates using guided waves is proposed. The proposed approach uses EMAT(Electro-MagneticAcoustic Transducer) for the non-contact generation and detection of guided waves in aluminumplates. Interesting features of the dispersive behavior in selected wave modes are used to detect platethinning. The experimental results show that the mode cutoff measurements provide a qualitativemeasurement of thinning detects and change in the mode group velocity can be used as quantitativeparameter of thinning depth measurement
    Type of Medium: Electronic Resource
    URL: http://www.tib-hannover.de/fulltexts/2011/0528/01/51/transtech_doi~10.4028%252Fwww.scientific.net%252FKEM.321-323.492.pdf
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  • 7
    Electronic Resource
    Electronic Resource
    Non-Contact Ultrasonic Inspection Technology of Fillet Weldments Monitoring (2006)
    s.l. ; Stafa-Zurich, Switzerland
    Key engineering materials Vol. 321-323 (Oct. 2006), p. 513-517 
    Details
    ISSN: 1013-9826
    Source: Scientific.Net: Materials Science & Technology / Trans Tech Publications Archiv 1984-2008
    Topics: Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics
    Notes: It's not easy to detect the defects in fillet weldment which is widely used in various buildingstructures and power plants just with nondestructive inspection due to its complex geometrical shapeand difficult access. But it's easy to detect the cracks on the surface or just below the surface of filletweldment heel part if surface SH-wave, among ultrasonic wave modes, is applied. The traditionalultrasound inspection using surface SH-wave is usually a contact method using piezoelectrictransducer, so it's not suitable for a field application because the reliability of inspection variesdepending on field environments such as couplant, contact pressure and pre-process, etc. Therefore,the necessity for non-contact ultrasound inspection is increasing. This study proposes non-contactultrasound inspection method using EMAT (electro-magnetic acoustic transducer), and presentednon-contact ultrasound inspection method for fillet weldment through experimental verification
    Type of Medium: Electronic Resource
    URL: http://www.tib-hannover.de/fulltexts/2011/0528/01/51/transtech_doi~10.4028%252Fwww.scientific.net%252FKEM.321-323.513.pdf
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  • 8
    Electronic Resource
    Electronic Resource
    Long Range Ultrasonic Guided Wave Technique for Inspection of Pipes (2006)
    s.l. ; Stafa-Zurich, Switzerland
    Key engineering materials Vol. 321-323 (Oct. 2006), p. 799-803 
    Details
    ISSN: 1013-9826
    Source: Scientific.Net: Materials Science & Technology / Trans Tech Publications Archiv 1984-2008
    Topics: Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics
    Notes: Conventional non-destructive techniques for inspection of weld in pipelines requiresignificant test time and high cost. In this paper, a study in the application of ultrasonic guided wavesto long range inspection of the pipeline is presented. The characteristics and setup of a long rangeguided wave inspection system and experimental results in pipes of various diameters are introduced.The experimental results in mock-up pipes with cluster type defects show that the limit of detectablewall thickness reduction with this guided wave system is 2~3% in the pipe cross section area and thewall thickness reduction of 5% in cross section area can be detected when actual detection level isused. Therefore, the applicability of the ultrasonic guided wave technique to long range pipelineinspection for wall thickness reduction is verified
    Type of Medium: Electronic Resource
    URL: http://www.tib-hannover.de/fulltexts/2011/0528/01/51/transtech_doi~10.4028%252Fwww.scientific.net%252FKEM.321-323.799.pdf
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  • 9
    Electronic Resource
    Electronic Resource
    Ultrasonic Guided-Wave Mode Identification in Pipe by Using Air-Coupled Transducer and Time-Frequency Analysis (2006)
    s.l. ; Stafa-Zurich, Switzerland
    Key engineering materials Vol. 321-323 (Oct. 2006), p. 804-807 
    Details
    ISSN: 1013-9826
    Source: Scientific.Net: Materials Science & Technology / Trans Tech Publications Archiv 1984-2008
    Topics: Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics
    Notes: For efficient NDE of pipes, essential components of power plant facilities, ultrasonicguided waves were generated and received applying an air-coupled transducer and comb one asnon-contact technology. Mode generation and selection were predicted based on theoreticaldispersive curve and the element space of a comb transducer. In addition, a receiving angle of theair-coupled transducer was determined to acquire the predicted modes by theoretical phase velocity ofeach mode. Theoretical dispersive curve was compared with the results of the time-frequencyspectroscopes based on the wavelet transform and 2D-FFT to identify the characteristics of thereceived mode. The received modes show a good agreement with the predicted ones
    Type of Medium: Electronic Resource
    URL: http://www.tib-hannover.de/fulltexts/2011/0528/01/51/transtech_doi~10.4028%252Fwww.scientific.net%252FKEM.321-323.804.pdf
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  • 10
    Electronic Resource
    Electronic Resource
    Ultrasonic Sensitivity Enhancement for Material Characterization Using Guided Wave Energy Loss Parameters (2004)
    s.l. ; Stafa-Zurich, Switzerland
    Key engineering materials Vol. 270-273 (Aug. 2004), p. 442-446 
    Details
    ISSN: 1013-9826
    Source: Scientific.Net: Materials Science & Technology / Trans Tech Publications Archiv 1984-2008
    Topics: Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics
    Type of Medium: Electronic Resource
    URL: http://www.tib-hannover.de/fulltexts/2011/0528/01/48/transtech_doi~10.4028%252Fwww.scientific.net%252FKEM.270-273.442.pdf
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