Journal of AE, Volume 25, 2007 (ca. 26 MB) - AEWG

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MEETING CALENDAR: EWGAE2008 28th European Conference on Acoustic Emission Testing will be held at Krakow, Poland on Sep. 17-19, 2008. It is organized by Dr. Jerzy Schmidt of Faculty of Mechanical Engineering, Crakow University of Technology, Krakow. Over 75 papers will be presented. Meeting details can be found at: http://www.ewgae.eu/ AEWG-51 51st Meeting of AEWG will be held at Fogelman Center, University of Memphis, Memphis, Tennessee, USA, on October 13-15, 2008. Abstracts should be sent to Dr. Gang Qi, (gangqi@memphis.edu) before July 16, 2008. http://www.aewg.org/ IAES-19, The 19 th International AE Symposium The IAES-19 will be held at Kyoto on Dec. 8-12, 2008. It is organized by Dr. T. Shiotani of Kyoto University and is sponsored by Japan Society for Non-Destructive Inspection. Abstracts are due Apr. 30, 2008. Details can be found at: http://www.19iaes-kyoto.com/ 2008 SUBSCRIPTION RATES Base rate (CD-ROM) for one year $111.00 CD-ROM + printed copy, US priority mail: $151.00 CD-ROM + printed copy, non-US priority mail: $156.00 Print copy only with priority shipping (US) $140.00 Print copy only with priority/air shipping (non-US) $145.00 For countries without Global Priority Service*, $160.00 * incl. Argentina, Greece, Italy, Russia, Ukraine Payment must be in U.S. dollars drawn on a U.S. bank. Bank transfer accepted at California Bank and Trust, San Fernando Valley Office (Account No. 080-03416470) 16130 Ventura Blvd, Encino, CA 91436 USA (Swift code: CALBUS66) PAYPAL payment is accepted. Inquire via e-mail. Back issues available; Inquiry and all orders should be sent to (or Fax 1-818-990-1686): Acoustic Emission Group PMB 409, 4924 Balboa Blvd. Encino, CA 91316 USA For inquiry through Internet, use the following address: aegroup7@gmail.com Editor-Publisher Kanji Ono Tel. (818) 849-9190 Publication Date of This Issue (Volume 25): 25 March 2008. I-10
In Memoriam H. Reginald Hardy, Jr. (1931 – 2008) H. Reginald Hardy Jr., Professor Emeritus of Mining Engineering, Department of Energy and Mineral Engineering, Penn State University, 76, of State College, PA, passed away Jan. 22, 2008. Born Aug. 19, 1931, in Ottawa, Canada, Reg was the loyal, loving husband of Margaret M. (Lytle) married in 1954, survived also by his two sons and a granddaughter. After getting BSc. from McGill University (1953), MSc. from Ottawa University (1962), both in physics, and Ph.D. in engineering mechanics from Virginia Polytechnic Institute in 1965, Reg joined the faculty at Penn State in 1966, following 13 years with Canada Department of Energy, Mines and Resources in Ottawa. During the past 40 years, Dr. Hardy had a passion for his scientific work in application of acoustic emission/microseismic (AE/MS) techniques to the geotechnical field. He conducted a number of major field and laboratory research projects and directed some 40 Ph.D. and Masters students, published numerous research papers in geotechnical and mining journals, four technical monographs, and 11 conference proceedings. Dr. Hardy organized six "Conferences on Acoustic Emission/Microseismic Activity in Geologic Structures and Materials," (1975-1996) and was active on the editorial review committee of the Journal of Acoustic Emission. His last major work was his book, Acoustic Emission Microseismic Activity, Vol. 1: Principles, Techniques and Geotechnical Applications (2003). He was the recipient of the ASTM Hogentogler and Templin Awards, the AEWG Achievement and Gold Medal Awards for "Pioneering work in the geologic applications of acoustic emission." He was working to his last day, perhaps on the second volume of his book. Reg will be sincerely missed by his family, friends and colleagues. (http://www.legacy.com/Link.asp?I=LS000101786354X) I-11 Kanji Ono
Page 3 and 4: JOURNAL OF ACOUSTIC EMISSION VOLUME
Page 5 and 6: 25-194 ACOUSTIC EMISSION SOURCE LOC
Page 7 and 8: Volume 25 (2007) AUTHORS INDEX DIMI
Page 9 and 10: YUICHI TOMODA, 25-021 T. TOUTOUNTZA
Page 11: Notes for Contributors 1. General T
Page 15 and 16: STRUCTURAL INTEGRITY EVALUATION USI
Page 17 and 18: The power-law AE behavior was recen
Page 19 and 20: sorting out the original signals, e
Page 21 and 22: Wood [36] in Australia has been usi
Page 23 and 24: One needs to appreciate the difficu
Page 25 and 26: In geotechnical applications, the p
Page 27 and 28: methods include the use of combined
Page 29 and 30: should take. Past attempts for stru
Page 31 and 32: 11. Suzuki, T., Ohtsu, M., Aoki, M.
Page 33 and 34: 40. http://en.wikipedia.org/wiki/Ma
Page 35 and 36: Abstract ACOUSTIC EMISSION TECHNIQU
Page 37 and 38: Fig. 1 Damage qualification by the
Page 39 and 40: After adding the data of a tested s
Page 41 and 42: Fig. 8 Sketch of a reinforced concr
Page 43 and 44: (3) Corrosion Process of Reinforced
Page 45 and 46: analysis. Corrosion cracking was si
Page 47 and 48: ACOUSTIC EMISSION MONITORING OF REI
Page 49 and 50: which - contrary to current beliefs
Page 51 and 52: Fig. 4. Applied load (actuator 1) a
Page 53 and 54: concrete and the jacket. Visual ins
Page 55 and 56: Based on conventional analysis, AE
Page 57 and 58: 2. Experimental The model pipe syst
Page 59 and 60: pressure, respectively. This is ana
Page 61 and 62: Fig. 6: Power spectra from fast Fou
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small leaks (below 0.1 mm diameter)
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ACOUSTIC EMISSION TECHNIQUE APPLIED
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parameters in time domain and (c) m
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above the threshold level of 40 dB
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energy, i.e., high amplitude and lo
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An optical microscopy observation o
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Continuous WT (CWT) is defined as a
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Fig. 8. Typical AE waveforms, their
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followed by abrupt jumps in the det
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E. Landis (1999), “Micro-macro fr
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EVALUATION OF REPAIR EFFECT FOR DET
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Fig. 2 Sensor array for tomography
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2 [ ] 2 k 3 9 2 2 1 f () 0 f ()
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At these depths, a complicated and
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The number of AE hits after repair
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damage indices of Calm and Load rat
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PVDF is a semicrystalline polymer,
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After these preliminary tests, the
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of PVDF sensors does not seem to ha
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Fig. 10. Evolution of a typical PAD
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Fig. 17. Evolution of a typical dur
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I-G. Kim, H-Y. Lee and J-W. Kim (20
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Pencil-lead breaks are monopoles an
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Fig. 1 Displacement vs. time, sourc
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Fig. 5 Displacement vs. time, sourc
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Fig. 8 Displacement versus time for
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Fig. 10 Displacement vs. time. Sour
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Fig. 14 Signal amplitude versus tim
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To better relate these PLB and FEM
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HIGH-TEMPERATURE ACOUSTIC EMISSION
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thickness of 9 μm. The AlN element
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Fig. 5 Experimental setup for AE mo
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scales (and possibly salt cracks at
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DAMPING, NOISE, AND IN-PLANE RESPON
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The sharper resonance in Fig. 1c is
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i 2 RMS VDCC0 k BT = , g m 2 i
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ecause in-plane motion mostly produ
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4. B. Bahreyni, C. Shafai, Fabricat
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We first introduce our new quadridi
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Fig. 4 Amplitude profile as a funct
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Fig. 6 Change of room temperature (
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3) There are slight time lags in th
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Function Generator (FG) The functio
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Table 1 Results for continuous sens
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Fig. 7 pulse response XXX, filter :
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Fig. 11: Noise spectrum VS30-SIC-46
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waves propagate in a plate like str
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0.15 0 100kHz Driving pulse 10 100k
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0.45 0 100kHz Driving pulse 30 100k
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the sensor response to different fr
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CHARACTERISTICS OFACOUSTIC EMISSION
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Results and Discussion Shrinkage pr
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sapwood. Norway spruce wood consist
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most of the cells reached the fiber
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CHARACTERIZATION OF TITANIUM HYDRID
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Growth behavior of hydrides We stud
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were determined by the tensile test
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Figure 9 shows the Mode-I cracks in
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Results obtained are summarized as
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process of hydrogen destruction of
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Amplitude [dB] 60 55 50 45 40 35 30
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(Fig. 7) relative to the material a
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is shown in Table 1. Test specimens
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Fig. 4 Two types of AE signals dete
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the charging solution at 25 o C, by
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ANALYSIS OF ACOUSTIC EMISSION FROM
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nearly same waveforms for the first
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values). Most (11 of 14) of the rec
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Type-D (at 3.45 ms). In this sample
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NEURAL NETWORK BURST PRESSURE PREDI
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temperature, while the remaining se
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not properly set). This results in
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Conclusions Table 3 Summary of trai
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accurate source locations could be
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Fig. 1 Group velocities versus freq
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plane source orientation. But the l
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Fig. 9 Out-of-plane displacement vs
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Fig. 11 WTs of Fig. 8 with superimp
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Fig. 13 WTs of Fig. 10 with superim
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Table 3 At 102 kHz, WT peak arrival
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Fig. 17 Frequency of maximum WT int
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Fig. 18 Arrangement of sensors (#1,
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location calculation result that yi
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NOVEL ACOUSTIC EMISSION SOURCE LOCA
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tion resolution. It should be noted
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The specimen with numerous holes wa
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Fig. 5. Comparison of location meth
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Conclusions Delta-T source location
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Our approach This conceptual view c
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Voronoi Construction: Taking a case
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Fig. 6: Source location on a clamp
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PROBABILITY OF DETECTION FOR ACOUST
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POD is determined at the convergenc
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Fig. 2: Setup for illustrative runs
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Fig. 7: Probability of location (PO
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AE signals were filtered by high-pa
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Fig. 3 Accuracy and variations of a
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Fig. 7 Accuracy and variations of a
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eference data. The absolute values
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REAL-TIME DENOISING OF AE SIGNALS B
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600 500 400 300 200 kHz700 Frequenc
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the STFT result (Fig. 4(b)). Theref
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MONITORING THE EVOLUTION OF INDIVID
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the type of filtering, number of su
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was observed for either actuator. F
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Conclusions An experimental methodo
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the onset of pulses, consequently,
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zeros. The locations where a patter
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The reliability of the additional p
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AE MONITORING OF SOIL CORROSION OF
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Fig. 2 Cumulative AE counts with ap
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cumulative event counts and amplitu
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AE was monitored using three types
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Our conclusion from these tests is
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measurements with an Exxon Nuclear
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equipment manufacturer), CISE (AE t
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Automatic testing of receptacles du
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The finalized standards are: • EN
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14. Tscheliesnig P., Lackner G., He
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Fig. 1. Typical high-temperature cr
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• Emission rates are much higher
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Fig. 4. Results of AE monitoring of
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examination at 2000-5000X was able
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samples extracted from the beam aft
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The relative comparison of the size
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Fig. 3. Schema of VB Application fo
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Fig. 5. Microstructural observation
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Fig. 7 AE source locations for diff
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Fig. 9 CT images and corresponding
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A.M. Brandt, G. Prokopski, J. Mater
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conducted with AE technique. The AE
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After location of the events, inter
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The transit times of the individual
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6) B. Schechinger, T. Vogel, Acoust
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greater than the available anchorag
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location uncertainty and is the roo
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Figures 4 and 5 illustrate all loca
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ig cracks form, localization of AE
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ased on magnetic induction, while i
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Fig. 3. AE sensors positioning on b
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As a further evaluation of the degr
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EARLY FAULT DETECTION AT GEAR UNITS
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Acoustic Emission Analysis at Rotat
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The fixed bearing at the beginning
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The time-frequency components of a
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Additionally, the gear test bench h
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APPLICATION OF ACOUSTIC EMISSION IN
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Measurements of the acoustic backgr
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Fig. 6. RMS for different ranges of
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which indicate the transition from
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surface condition. It has already b
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( 2 1) 2) ! kx1 ! k c ! x + c ! k (
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Fig. 6: Signal above normal and def
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DAMAGE ASSESSMENT OF GEARBOX OPERAT
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The waveform streaming can be trigg
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Extracting features using different
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The classifier was used to identify
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ASL spectral energy is further calc
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2 #_ of _ Sensors 2 2 2 ( x ) (
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Simulated Failure Plane One hundred
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It has been documented that the ini
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(a) (b) (c) (d) 95% _ 98% 98% _ 100
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IMPACT IMAGING METHOD TO MAP DAMAGE
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e) Step d) was repeated until the a
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Panel A Panel B Panel C Panel D Fig
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Journal of AE, Volume 25, 2007 (ca. 26 MB) - AEWG

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