Understanding Acoustic Emission Testing- Reading 1 Part B-A

More documents

Recommendations

Info

Q7. The terms ""counts"" refers to: A. the number of times a signal crosses a preset threshold. B. the number of events from a source. C. the number of transducers required to perform a test. D. none of the above. Q8. The acoustic emission signal amplitude is related to: A. the intensity of the source. (as well as source nearness to the transducer?) B. the preset threshold. C. the band pass filters. D. background noises. Charlie Chong/ Fion Zhang http://www.gwhizmobile.com/mobile/CatalogDetail.php?tag=flash&key=0Aq7qOvnO3eKsdDBoVjZvUX JQZjhKWlpKNjVERmt4aEE&action=view&title=ASNT%20Level%20III%20Basic%20AE%2FET
Q9. Threshold settings are determined by: A. the background noise level. B. the test duration. C. the attenuation of the material. D. the graininess of the material. Q10. Background noise can be reduced by: A. electronic filtering. B. using flat response amplifiers. C. using in-line amplifiers. D. using heavier gauge coaxial cable. Charlie Chong/ Fion Zhang http://www.gwhizmobile.com/mobile/CatalogDetail.php?tag=flash&key=0Aq7qOvnO3eKsdDBoVjZvUX JQZjhKWlpKNjVERmt4aEE&action=view&title=ASNT%20Level%20III%20Basic%20AE%2FET
Page 1 and 2:
Understanding Acoustic Emission Tes
Page 3 and 4:
Concrete Offshore structure Charlie
Page 5 and 6:
Refinery Applications Charlie Chong
Page 7 and 8:
Charlie Chong/ Fion Zhang
Page 9 and 10:
The Magical Book of Acoustic Emissi
Page 11 and 12:
ASNT Certification Guide NDT Level
Page 13 and 14:
3 Techniques • Equipment calibrat
Page 15 and 16:
Fion Zhang at Shanghai 3rd Septembe
Page 17 and 18:
Charlie Chong/ Fion Zhang http://gr
Page 19 and 20:
Video on - Leak Detection on Buried
Page 21 and 22:
ASME V Article Numbers: Gen Article
Page 23 and 24:
ASTM Standards E976 - 05 Standard G
Page 25 and 26:
ASTM Standards E1781 - 08 Standard
Page 27 and 28:
Typical AET Signal https://dspace.l
Page 29 and 30:
Study Note 1: AET http://www.geocit
Page 31 and 32:
Until about 1973, acoustic emission
Page 33 and 34:
Charlie Chong/ Fion Zhang http://ww
Page 35 and 36:
AE Technique The AE technique (AET)
Page 37 and 38:
What is Normal (Gaussian) distribut
Page 39 and 40:
Probability density function for th
Page 41 and 42:
Cumulative distribution function of
Page 43 and 44:
Crystal Twinning Crystal twinning o
Page 45 and 46:
What is Crystal Twinning Crystal tw
Page 47 and 48:
Crystal Twinning Charlie Chong/ Fio
Page 49 and 50:
Crystal Twinning- Diagram of twinne
Page 51 and 52:
AET Set-up Charlie Chong/ Fion Zhan
Page 53 and 54:
Continuous type Charlie Chong/ Fion
Page 55 and 56:
Discussion Subject: explains on the
Page 57 and 58:
Kaiser Effect Plastic deformation i
Page 59 and 60:
Felicity effect is an effect in aco
Page 61 and 62:
Activity of AE Sources in Structura
Page 63 and 64:
Felicity Effect - the applied load
Page 65 and 66:
AE Parameters Various parameters us
Page 67 and 68:
AET Advantages AE testing is a powe
Page 69 and 70:
A Few Typical Applications • Dete
Page 71 and 72:
Acoustic Emission Testing Advantage
Page 73 and 74:
End of Reading 1 Charlie Chong/ Fio
Page 75 and 76:
16 Acoustic Emission Methods Charli
Page 77 and 78:
Page 79 and 80:
Foreword: Acoustic emission refers
Page 81 and 82:
Acoustic emissions, which occur in
Page 83 and 84:
At about the same time, but indepen
Page 85 and 86:
Figure 1: A cube with sides of leng
Page 87 and 88:
Green also noted the Kaiser effect,
Page 89 and 90:
16.3 Theoretical Considerations Whe
Page 91 and 92:
FIGURE 16.1 The two basic types of
Page 93 and 94:
FIGURE 16.2 A typical acoustic emis
Page 95 and 96:
FIGURE 16.3 Typical view of an acou
Page 97 and 98:
1. The total number of counts (e.g.
Page 99 and 100:
■ Rise time — This is the inter
Page 101 and 102:
Energy analysis — This is an indi
Page 103 and 104:
FIGURE 16.5 The main elements of a
Page 105 and 106:
Fourier-Transform (FT) The Fourier
Page 107 and 108:
Signal Evaluation: Analysis of the
Page 109 and 110:
Signal Evaluation: Raise Time/ Even
Page 111 and 112:
Signal Evaluation: Amplitude Distri
Page 113 and 114:
Signal Evaluation: Energy analysis-
Page 115 and 116:
Signal Evaluation: Raise Time/ Even
Page 117 and 118:
FIGURE 16.5 The main elements of a
Page 119 and 120:
A brief description of the most imp
Page 121 and 122:
PZT:- If the p.d or the stress is c
Page 123 and 124:
AET Transducer In 0.1KHz~2.0KHz Cha
Page 125 and 126:
2. Preamplifier: Because of the low
Page 127 and 128:
There are generally two (or more) c
Page 129 and 130:
Spooner and Dougill confirmed that
Page 131 and 132:
Spooner and Dougill conclusion on K
Page 133 and 134:
16.6.3 Signal Attenuation The elast
Page 135 and 136:
16.6.4 Specimen Geometry It has bee
Page 137 and 138:
16.6.6 Concrete Strength It has bee
Page 139 and 140:
16.7.1 Fracture Mechanics Studies A
Page 141 and 142:
16.7.2 Type of Cracks A number of a
Page 143 and 144:
They found that, while the number o
Page 145 and 146:
Sadowska-Boczar et al. tried to qua
Page 147 and 148:
FIGURE 16.7 Within-batch variabilit
Page 149 and 150:
16.7.6 Fiber Reinforced Cements and
Page 151 and 152:
Fiber Reinforced Cements and Concre
Page 153 and 154:
Perhaps the most extensive series o
Page 155 and 156:
16.7.8 Thermal Cracking Relatively
Page 157 and 158:
They found that acoustic emissions
Page 159 and 160:
Corrosion of Reinforcing Steel in C
Page 161 and 162:
16.8 Field Studies of Acoustic Emis
Page 163 and 164:
16.9 Conclusions From the discussio
Page 165 and 166:
Concrete Structures Charlie Chong/
Page 167 and 168:
Concrete Structures Charlie Chong/
Page 169 and 170:
Concrete Structures- The Troll A pl
Page 171 and 172:
Concrete Structures- The Troll A pl
Page 173 and 174:
End of Reading 2 Charlie Chong/ Fio
Page 175 and 176:
1.0 Introduction Acoustic Emission
Page 177 and 178:
Twinning Charlie Chong/ Fion Zhang
Page 179 and 180:
Acoustic Emission is unlike most ot
Page 181 and 182:
2.0 A Brief History of AE Testing A
Page 183 and 184:
3.0 Theory - AE Sources As mentione
Page 185 and 186:
The amount of energy released by an
Page 187 and 188:
Activity of AE Sources in Structura
Page 189 and 190:
Kaiser/Felicity effects Felicity ef
Page 191 and 192:
Dunegan corollary states that if ac
Page 193 and 194:
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 and 246:
Other Reading: Lamb Wave Lamb waves
Page 247 and 248:
Fig. 4 Diagram of the basic pattern
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
Page 297 and 298: • acoustic emission signature (si
Page 299 and 300: • array, n- a group of two or mor
Page 301 and 302: • continuous emission- see emissi
Page 303 and 304: • dB AE - a logarithmic measure o
Page 305 and 306: AE signal amplitude measured as a r
Page 307 and 308: • distribution, differential (aco
Page 309 and 310: effective velocity, n- velocity cal
Page 311 and 312: FIG. 1 Burst Emission on a Continuo
Page 313 and 314: FIG. 3 Continuous Emission. (Sweep
Page 315 and 316: examination area- that portion of a
Page 317 and 318: Kaiser effect- the absence of detec
Page 319 and 320: Linear, Planar, 3D Linear 3D Planar
Page 321 and 322: location, continuous AE signal, n-
Page 323 and 324: Methods of Location • Hit method
Page 325 and 326: logarithmic (acoustic emission) amp
Page 327 and 328: signal overload level- that level a
Page 329 and 330: stimulation- the application of a s
Page 331 and 332: End of Reading 4 Charlie Chong/ Fio
Page 333 and 334: Q1. The most common range of acoust
Page 335: Q5. The felicity effect is useful i
Page 339 and 340: Q12. What is the Felicity Effect? A
Page 341 and 342: Q15. A Hsu-Nielson Source: A. measu
Page 343 and 344: Q19. The term ""rise time"" refers
Page 345 and 346: Q23. Four types of AE Source Locati
Page 347 and 348: Study Note 6: High Strength Steel-
Page 349 and 350: The properties of different steels
Page 351 and 352: Keywords: • DP (dual phase), •
Page 353 and 354: Figure 1: Ductility-strength relati
Page 355 and 356: However, with conventional TRIP ste
Page 357 and 358: Back to Basic: Martensite Martensit
Page 359 and 360: Keywords: Hexagonal & BCC Martensit
Page 361 and 362: Figure 2: The stress-strain diagram
Page 363 and 364: Also, the TRIP steel is particularl
Page 365 and 366: Figure 3: The diagram shows the ver
Page 367 and 368: Table 1: Effect of alloying element
Page 369 and 370: ■ B, Ti, Zr Adding small amounts
Page 371 and 372: Acoustic Emission Technique the opt
Page 373 and 374: ASM introduction Since 1908, ASM is
Page 375 and 376: Active approach to leak detection T
Page 377 and 378: Leak detection and location The mod
Page 379 and 380: ■ Method of testing (Linear) The
Page 381 and 382: Fig 2: Cross-correlation function p
Page 383 and 384: The figure 1 shows how the position
Page 385 and 386: Area surveys using acoustic loggers
Page 387 and 388:
The reading of an area meter could
Page 389 and 390:
CONCLUSIONS In the last fifteen yea
Page 391 and 392:
■ ωσμ∙Ωπ∆ ∇ º≠δ≤
Page 393 and 394:
Page 395 and 396:
Peach - 我爱桃子 Charlie Cho
Page 397 and 398:
Good Luck Charlie Chong/ Fion Zhang
Page 399:
show all

Understanding Acoustic Emission Testing- Reading 1 Part B-A

Create successful ePaper yourself

Delete template?

Save as template?