Understanding Acoustic Emission Testing- Reading 1 Part B-A

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The form is determined by whether the particle motion is symmetrical or asymmetrical with respect to the neutral axis of the test piece. Each form is further subdivided into several modes having different velocities, which can be controlled by the angle at which the waves enter the test piece. Theoretically, there are an infinite number of specific velocities at which Lamb waves can travel in a given material. Within a given plate, the specific velocities for Lamb waves are complex functions of plate thickness and frequency. In symmetrical (dilatational) Lamb waves, there is a compressional (longitudinal) particle displacement along the neutral axis of the plate and an elliptical particle displacement on each surface (Fig. 4a). In asymmetrical (bending) Lamb waves, there is a shear (transverse) particle displacement along the neutral axis of the plate and an elliptical particle displacement on each surface (Fig. 4b). The ratio of the major to minor axes of the ellipse is a function of the material in which the wave is being propagated. Charlie Chong/ Fion Zhang
Fig. 4 Diagram of the basic patterns of (a) symmetrical (dilatational) and (b) asymmetrical (bending) Lamb waves. The wavelength, , is the distance corresponding to one complete cycle. Charlie Chong/ Fion Zhang
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Understanding Acoustic Emission Tes
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Concrete Offshore structure Charlie
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Refinery Applications Charlie Chong
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Charlie Chong/ Fion Zhang
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The Magical Book of Acoustic Emissi
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ASNT Certification Guide NDT Level
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3 Techniques • Equipment calibrat
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Fion Zhang at Shanghai 3rd Septembe
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Charlie Chong/ Fion Zhang http://gr
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Video on - Leak Detection on Buried
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ASME V Article Numbers: Gen Article
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ASTM Standards E976 - 05 Standard G
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ASTM Standards E1781 - 08 Standard
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Typical AET Signal https://dspace.l
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Study Note 1: AET http://www.geocit
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Until about 1973, acoustic emission
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Charlie Chong/ Fion Zhang http://ww
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AE Technique The AE technique (AET)
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What is Normal (Gaussian) distribut
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Probability density function for th
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Cumulative distribution function of
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Crystal Twinning Crystal twinning o
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What is Crystal Twinning Crystal tw
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Crystal Twinning Charlie Chong/ Fio
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Crystal Twinning- Diagram of twinne
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AET Set-up Charlie Chong/ Fion Zhan
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Continuous type Charlie Chong/ Fion
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Discussion Subject: explains on the
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Kaiser Effect Plastic deformation i
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Felicity effect is an effect in aco
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Activity of AE Sources in Structura
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Felicity Effect - the applied load
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AE Parameters Various parameters us
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AET Advantages AE testing is a powe
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A Few Typical Applications • Dete
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Acoustic Emission Testing Advantage
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End of Reading 1 Charlie Chong/ Fio
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16 Acoustic Emission Methods Charli
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Foreword: Acoustic emission refers
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Acoustic emissions, which occur in
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At about the same time, but indepen
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Figure 1: A cube with sides of leng
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Green also noted the Kaiser effect,
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16.3 Theoretical Considerations Whe
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FIGURE 16.1 The two basic types of
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FIGURE 16.2 A typical acoustic emis
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FIGURE 16.3 Typical view of an acou
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1. The total number of counts (e.g.
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■ Rise time — This is the inter
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Energy analysis — This is an indi
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FIGURE 16.5 The main elements of a
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Fourier-Transform (FT) The Fourier
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Signal Evaluation: Analysis of the
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Signal Evaluation: Raise Time/ Even
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Signal Evaluation: Amplitude Distri
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Signal Evaluation: Energy analysis-
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Signal Evaluation: Raise Time/ Even
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FIGURE 16.5 The main elements of a
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A brief description of the most imp
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PZT:- If the p.d or the stress is c
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AET Transducer In 0.1KHz~2.0KHz Cha
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2. Preamplifier: Because of the low
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There are generally two (or more) c
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Spooner and Dougill confirmed that
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Spooner and Dougill conclusion on K
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16.6.3 Signal Attenuation The elast
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16.6.4 Specimen Geometry It has bee
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16.6.6 Concrete Strength It has bee
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16.7.1 Fracture Mechanics Studies A
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16.7.2 Type of Cracks A number of a
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They found that, while the number o
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Sadowska-Boczar et al. tried to qua
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FIGURE 16.7 Within-batch variabilit
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16.7.6 Fiber Reinforced Cements and
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Fiber Reinforced Cements and Concre
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Perhaps the most extensive series o
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16.7.8 Thermal Cracking Relatively
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They found that acoustic emissions
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Corrosion of Reinforcing Steel in C
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16.8 Field Studies of Acoustic Emis
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16.9 Conclusions From the discussio
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Concrete Structures Charlie Chong/
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Concrete Structures Charlie Chong/
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Concrete Structures- The Troll A pl
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Concrete Structures- The Troll A pl
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1.0 Introduction Acoustic Emission
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Twinning Charlie Chong/ Fion Zhang
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Acoustic Emission is unlike most ot
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2.0 A Brief History of AE Testing A
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3.0 Theory - AE Sources As mentione
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The amount of energy released by an
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Activity of AE Sources in Structura
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Kaiser/Felicity effects Felicity ef
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Dunegan corollary states that if ac
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Comments: Emissions are observed pr
Page 195 and 196: Pseudo Sources In addition to the A
Page 197 and 198: Wave Propagation A primitive wave r
Page 199 and 200: Waves radiates from the source in a
Page 201 and 202: Angular dependence of acoustic emis
Page 203 and 204: The signal that is detected by a se
Page 205 and 206: highly damped, nonmetallic material
Page 207 and 208: Attenuation: 1. Spread (30% for 2D,
Page 209 and 210: Teflon shoe http://www.ndt.net/ndta
Page 211 and 212: Lamb waves in acoustic emission tes
Page 213 and 214: 2.2.5 Rayleigh Characteristics Rayl
Page 215 and 216: Q29: The longitudinal wave incident
Page 217 and 218: The major axis of the ellipse is pe
Page 219 and 220: Surface wave Charlie Chong/ Fion Zh
Page 221 and 222: Surface wave has the ability to fol
Page 223 and 224: Surface wave - One wavelength deep
Page 225 and 226: Rayleigh Wave Charlie Chong/ Fion Z
Page 227 and 228: Love Wave Charlie Chong/ Fion Zhang
Page 229 and 230: Other Reading: Rayleigh Waves Surfa
Page 231 and 232: Q110: What kind of wave mode travel
Page 233 and 234: Q192: Surface waves are reduced to
Page 235 and 236: Since the 1990s, the understanding
Page 237 and 238: Plate or Lamb waves are the most co
Page 239 and 240: Plate wave or Lamb wave are formed
Page 241 and 242: When guided in layers they are refe
Page 243 and 244: Symmetrical = extensional mode Asym
Page 245: Other Reading: Lamb Wave Lamb waves
Page 249 and 250: 2.2.7 Dispersive Wave: Wave modes s
Page 251 and 252: Discussion Subject: Wave Mode and V
Page 253 and 254: Key Points: • Two classes: resona
Page 255 and 256: Q. The most common range of acousti
Page 257 and 258: Equipment- Probe Charlie Chong/ Fio
Page 259 and 260: Schematic Diagram of a Basic Four-c
Page 261 and 262: After passing the AE system mainfra
Page 263 and 264: AET Charlie Chong/ Fion Zhang
Page 265 and 266: 6.0 AE Signal Features With the equ
Page 267 and 268: Amplitude, A, is the greatest measu
Page 269 and 270: 7.0 Data Display Software-based AE
Page 271 and 272: Intensity displays are used to give
Page 273 and 274: Amplitude/counts Signal Analysis Th
Page 275 and 276: Source location techniques assume t
Page 277 and 278: Because the above scenario implicit
Page 279 and 280: When additional sensors are applied
Page 281 and 282: 9.0 AE Barkhausen Techniques The Ba
Page 283 and 284: Hysterisis Loop- magnetization or d
Page 285 and 286: ■ Bucket Truck (Cherry Pickers) I
Page 287 and 288: ■ Gas Trailer Tubes Acoustic emis
Page 289 and 290: ■ Aerospace Structures Most aeros
Page 291 and 292: Others • Fiber-reinforced polymer
Page 293 and 294: Study Note 4: ASTM E1316 Term & Def
Page 295 and 296: • acoustic emission (AE)- the cla
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• acoustic emission signature (si
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• array, n- a group of two or mor
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• continuous emission- see emissi
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• dB AE - a logarithmic measure o
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AE signal amplitude measured as a r
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• distribution, differential (aco
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effective velocity, n- velocity cal
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FIG. 1 Burst Emission on a Continuo
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FIG. 3 Continuous Emission. (Sweep
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examination area- that portion of a
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Kaiser effect- the absence of detec
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Linear, Planar, 3D Linear 3D Planar
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location, continuous AE signal, n-
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Methods of Location • Hit method
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logarithmic (acoustic emission) amp
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signal overload level- that level a
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stimulation- the application of a s
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Q1. The most common range of acoust
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Q5. The felicity effect is useful i
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Q9. Threshold settings are determin
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Q12. What is the Felicity Effect? A
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Q15. A Hsu-Nielson Source: A. measu
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Q19. The term ""rise time"" refers
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Q23. Four types of AE Source Locati
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Study Note 6: High Strength Steel-
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The properties of different steels
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Keywords: • DP (dual phase), •
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Figure 1: Ductility-strength relati
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However, with conventional TRIP ste
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Back to Basic: Martensite Martensit
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Keywords: Hexagonal & BCC Martensit
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Figure 2: The stress-strain diagram
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Also, the TRIP steel is particularl
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Figure 3: The diagram shows the ver
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Table 1: Effect of alloying element
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■ B, Ti, Zr Adding small amounts
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Acoustic Emission Technique the opt
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ASM introduction Since 1908, ASM is
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Active approach to leak detection T
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Leak detection and location The mod
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■ Method of testing (Linear) The
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Fig 2: Cross-correlation function p
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The figure 1 shows how the position
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Area surveys using acoustic loggers
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The reading of an area meter could
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CONCLUSIONS In the last fifteen yea
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■ ωσμ∙Ωπ∆ ∇ º≠δ≤
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Peach - 我爱桃子 Charlie Cho
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Good Luck Charlie Chong/ Fion Zhang
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