- Page 1 and 2: My Reading on Acoustic Emission Tes
- Page 3 and 4: Acoustic Emission Testing Charlie C
- Page 5 and 6: Acoustic Emission Testing Charlie C
- Page 7 and 8: Charlie Chong/ Fion Zhang Fion Zhan
- Page 9 and 10: http://www.yumpu.com/zh/browse/user
- Page 11 and 12: The Magical Book of Tank Inspection
- Page 13 and 14: 2 Equipment and Materials • Trans
- Page 15 and 16: References & Catalog Numbers • ND
- Page 17 and 18: 闭 门 练 功 Charlie Chong/ Fion
- Page 19 and 20: API: RP 575 - Guidelines and Method
- Page 21 and 22: Acoustic Emission Non-Destructive T
- Page 23 and 24: Nuclear Silo Charlie Chong/ Fion Zh
- Page 25 and 26: Foreword Acoustic emission techniqu
- Page 27 and 28: Saturn S-II propellant tank Charlie
- Page 29 and 30: For the last forty years, the autho
- Page 31 and 32: Following a general discussion of a
- Page 33 and 34: 1.0 CHAPTER 1 1.1. Introduction to
- Page 35 and 36: The stress change must be rapid eno
- Page 37 and 38: The apparent location of the source
- Page 39: An acoustic emission test occurs in
- Page 43 and 44: Figure 1-1. Examples of burst emiss
- Page 45 and 46: This complete dependence on local c
- Page 47 and 48: In structural metals, both inter-gr
- Page 49 and 50: The most likely cause of this emiss
- Page 51 and 52: 2.0 CHAPTER 2 2.1. Acoustic Waves i
- Page 53 and 54: In a compressional wave, the averag
- Page 55 and 56: The ability of the atoms to change
- Page 57 and 58: The frequency, wave length, and wav
- Page 59 and 60: If two waves exist in a medium simu
- Page 61 and 62: 2.4. Acoustic Media An acoustic wav
- Page 63 and 64: The reflection and transmission of
- Page 65 and 66: For longitudinal waves, the average
- Page 67 and 68: Figure 2-2. Particle displacement f
- Page 69 and 70: Figure 2-3. Waveform with compressi
- Page 71 and 72: Figure 2-4. Particle displacements
- Page 73 and 74: 2.6. Dispersion and Group Velocity
- Page 75 and 76: Figure 2-5. Phase velocities for di
- Page 77 and 78: 2.7. Attenuation A wave packet is g
- Page 79 and 80: Charlie Chong/ Fion Zhang https://r
- Page 81 and 82: Charlie Chong/ Fion Zhang
- Page 83 and 84: Mathematically, this is an exponent
- Page 85 and 86: Both forms of the attenuation const
- Page 87 and 88: When a plane wave strikes the inter
- Page 89 and 90: For non-perpendicular angles of inc
- Page 91 and 92:
Figure 2-6. Reflected and transmitt
- Page 93 and 94:
2.9. Resonance The phenomenon of re
- Page 95 and 96:
If there are a great many reflectio
- Page 97 and 98:
Longitudinal waves- Plane pressure
- Page 99 and 100:
Shear Wave- Plane shear wave S-wave
- Page 101 and 102:
Longitudinal Waves In a longitudina
- Page 103 and 104:
Transverse Waves In a transverse wa
- Page 105 and 106:
Rayleigh surface waves Another exam
- Page 107 and 108:
Condition monitoring of large oil a
- Page 109 and 110:
1. Introduction In producing a syst
- Page 111 and 112:
Fig.1. Schematic of lap joint model
- Page 113 and 114:
Fig.2. Phase velocity dispersion cu
- Page 115 and 116:
The phase velocity dispersion curve
- Page 117 and 118:
3. Finite element model A finite el
- Page 119 and 120:
Fig.5. Lamb wave propagating in ste
- Page 121 and 122:
Fig.6. Finite element modelling res
- Page 123 and 124:
5. Conclusions There is great poten
- Page 125 and 126:
The relationship between velocity a
- Page 127 and 128:
Dispersions curves of free Lamb wav
- Page 129 and 130:
Because of the wide range of freque
- Page 131 and 132:
Magnetostrictive ultrasonic transdu
- Page 133 and 134:
The effect is symmetrical because a
- Page 135 and 136:
3.1.3. Size Effects An infinitesima
- Page 137 and 138:
The result is that a piezoelectric
- Page 139 and 140:
Standing Wave Formation The animati
- Page 141 and 142:
Standing Wave Patterns for Vibratin
- Page 143 and 144:
Harmonic: Charlie Chong/ Fion Zhang
- Page 145 and 146:
Fundamental and Harmonics with one
- Page 147 and 148:
Open End Standing Wave Patterns Cha
- Page 149 and 150:
Harmonic: If both ends of the strin
- Page 151 and 152:
Figure 3-1. (a) Deformation of a ma
- Page 153 and 154:
In addition to resonance effects, t
- Page 155 and 156:
This averaging essentially reduces
- Page 157 and 158:
Although the terms bond and couplan
- Page 159 and 160:
A flexible bond can also be used. O
- Page 161 and 162:
3.1.5. Temperature Effects The temp
- Page 163 and 164:
The strain necessary to produce a d
- Page 165 and 166:
The open circuit voltage produced b
- Page 167 and 168:
3.1.7. Sensor Sensitivity - Effect
- Page 169 and 170:
The three preamplifier spectral res
- Page 171 and 172:
The noise contributed by the sensor
- Page 173 and 174:
3.1.8. Sensor Calibration All manuf
- Page 175 and 176:
That the velocity calibration curve
- Page 177 and 178:
However, the NBS calibrations offer
- Page 179 and 180:
Current computer systems are much f
- Page 181 and 182:
A large number of commercial acoust
- Page 183 and 184:
Signal rise time This channel clock
- Page 185 and 186:
Both the time measurements and the
- Page 187 and 188:
The acoustic attenuation of plastic
- Page 189 and 190:
This maximum does not mean that hig
- Page 191 and 192:
The detection threshold is set duri
- Page 193 and 194:
An event group is defined as a numb
- Page 195 and 196:
Figure 4-1. Acoustic emission signa
- Page 197 and 198:
From Fig. 2-3b (above, section 2-6)
- Page 199 and 200:
The acoustic emission count was one
- Page 201 and 202:
In the calibration of the absolute
- Page 203 and 204:
Figure 4-2. The spectra (c) of a da
- Page 205 and 206:
4.1.3. Noise Suppression The defini
- Page 207 and 208:
Acoustic emission signals occur ran
- Page 209 and 210:
Another problem is unwanted acousti
- Page 211 and 212:
A final comment about noise signals
- Page 213 and 214:
The design of an acoustic emission
- Page 215 and 216:
5.1.2. Acoustic Properties of Mater
- Page 217 and 218:
Boron Composite Rice researchers Ro
- Page 219 and 220:
Advance Composite Charlie Chong/ Fi
- Page 221 and 222:
Each component material (fiber, res
- Page 223 and 224:
5.1.4. Simple Attenuation and Veloc
- Page 225 and 226:
The averages of the two number sets
- Page 227 and 228:
The triangular pattern covers somew
- Page 229 and 230:
5.1.6. AE System Setup The setup of
- Page 231 and 232:
The timing parameters PDT, HDT and
- Page 233 and 234:
Figure 5-1. Electronic bandpass cha
- Page 235 and 236:
Required waveform acquisition setti
- Page 237 and 238:
Because most acoustic signals conta
- Page 239 and 240:
On a proof test or load-to-failure
- Page 241 and 242:
The location setup table allows the
- Page 243 and 244:
In AEwin three parameters are assoc
- Page 245 and 246:
Another entry in the location table
- Page 247 and 248:
5.1.8. Example of Setup The best wa
- Page 249 and 250:
Figure 5-2. Layout diagram of 24 se
- Page 251 and 252:
The next step is to set up the real
- Page 253 and 254:
6.0 CHAPTER 6 6.1. Source Location
- Page 255 and 256:
Assuming materials are isotropic ma
- Page 257 and 258:
Another major problem with AE sourc
- Page 259 and 260:
A way around the problem of analyti
- Page 261 and 262:
Another approximation used in sourc
- Page 263 and 264:
The presence of a cluster indicates
- Page 265 and 266:
Figure 7-12. Location graph of tens
- Page 267 and 268:
7.0 CHAPTER 7 7.1. Analysis The pri
- Page 269 and 270:
Figure 7-13 shows the total energy
- Page 271 and 272:
Figure 7-13. Total energy vs. cycle
- Page 273 and 274:
Figure 7-6. Graphs of scatter point
- Page 275 and 276:
Controlled flaw growth will occur w
- Page 277 and 278:
Analysis of an acoustic emission te
- Page 279 and 280:
The second type of loading is the f
- Page 281 and 282:
7.1.1.1. A graph of the hits, event
- Page 283 and 284:
Figure 7-1. Stable to unstable flaw
- Page 285 and 286:
7.1.1.2. Location graphs in real ti
- Page 287 and 288:
location of the cluster on the stru
- Page 289 and 290:
Another point that should be mentio
- Page 291 and 292:
From the graphs in Figs.7-2 and 7-3
- Page 293 and 294:
Figure 7-3. Amplitude distributions
- Page 295 and 296:
7.1.1.5. A bar graph of the number
- Page 297 and 298:
Figure 7-5. Hits vs. Channel, a. Li
- Page 299 and 300:
7.1.1.6. A scatter point graph as a
- Page 301 and 302:
Figure 7-6. Graphs of scatter point
- Page 303 and 304:
There is one more procedure which c
- Page 305 and 306:
Now look at Figure 7-8. This shows
- Page 307 and 308:
This is seen in Figure 7-9 displaye
- Page 309 and 310:
Figure 7-10. Hits vs. Energy distri
- Page 311 and 312:
7.1.2. Post-Test Analysis The first
- Page 313 and 314:
Most of post-test analysis consists
- Page 315 and 316:
Figure 7-11 is very similar to Figu
- Page 317 and 318:
Figure 7-12. Location graph of tens
- Page 319 and 320:
Therefore, the whole front surface
- Page 321 and 322:
Figure 7-13. Total energy vs. cycle
- Page 323 and 324:
These results suggested local stres
- Page 325 and 326:
One array of four sensors was place
- Page 327 and 328:
Figure 8-1. Construction diagram an
- Page 329 and 330:
Figure 8-3. Final source location c
- Page 331 and 332:
The test results were far from what
- Page 333 and 334:
The initial velocity measurement ha
- Page 335 and 336:
This test showed that accurate acou
- Page 337 and 338:
Figure 8-6. Same data as Fig. 8-3,
- Page 339 and 340:
Figure 9-1. Flat-back airfoils of B
- Page 341 and 342:
These static tests indicated that t
- Page 343 and 344:
The data collected by the AE system
- Page 345 and 346:
Figure 9-2. Location graphs for the
- Page 347 and 348:
The test was run first for one mill
- Page 349 and 350:
The energy emission rates showed a
- Page 351 and 352:
Figure 9-3. Total energy released o
- Page 353 and 354:
Sandia answered an industry request
- Page 355 and 356:
The sensors used were the PAC nano-
- Page 357 and 358:
Figure 10-1. Acoustic Emission Halo
- Page 359 and 360:
coupled, the program stops and requ
- Page 361 and 362:
Figure 10-2. Diagram of halon bottl
- Page 363 and 364:
The detection of pseudo-exponential
- Page 365 and 366:
The corroding agent is thought to a
- Page 367 and 368:
Assessment of Cutting Tool Conditio
- Page 369 and 370:
Terminology AE MARSE MP MAMP MVMP A
- Page 371 and 372:
The AE method consists of studying
- Page 373 and 374:
Waveform allows a more profound and
- Page 375 and 376:
2.2. Drill bits Defects were produc
- Page 377 and 378:
The condition of the blunted edges
- Page 379 and 380:
Fig. 1. Modification of cutting edg
- Page 381 and 382:
2.4. Signal analysis The AE data wa
- Page 383 and 384:
Furthermore, non-stationary and qua
- Page 385 and 386:
At the bottom of Fig. 4 two well-de
- Page 387 and 388:
The developed method would be usefu
- Page 389 and 390:
Fig. 4. Evolution of MVMP vs. MAMP
- Page 391 and 392:
Fig. 5. (a) QSR (waveforms/sec) vs.
- Page 393 and 394:
Fig. 6. (a) Mean power related to c
- Page 395 and 396:
Different behaviors were observed b
- Page 397 and 398:
ACOUSTIC EMISSION Part IV Universit
- Page 399 and 400:
Advantages: in service large struct
- Page 401 and 402:
Ceramics: grain boundary cracking g
- Page 403 and 404:
Phase transformation: Δσ(t) ≈
- Page 405 and 406:
Charlie Chong/ Fion Zhang
- Page 407 and 408:
Acoustic Emission in Composite glas
- Page 409 and 410:
Types of Acoustic Emission Charlie
- Page 411 and 412:
Wave Dispersion Dispersion means th
- Page 413 and 414:
Data Collection and Analysis Charli
- Page 415 and 416:
Typical AE Instrumentation Charlie
- Page 417 and 418:
Data Representation Charlie Chong/
- Page 419 and 420:
Charlie Chong/ Fion Zhang
- Page 421 and 422:
Source Location and Characterizatio
- Page 423 and 424:
Source Location for Two Sensors Cha
- Page 425 and 426:
Reading#4 Charlie Chong/ Fion Zhang
- Page 427 and 428:
Preface This work studies the acous
- Page 429 and 430:
Some important parameters of the wa
- Page 431 and 432:
Figure 1: Typical AE waveform. RA i
- Page 433 and 434:
In the present paper a case of AEmo
- Page 435 and 436:
Vrije Universiteit Brussel (VUB) Ch
- Page 437 and 438:
2.1. TRC in Tension and Compression
- Page 439 and 440:
3. Experimental Part 3.1. Materials
- Page 441 and 442:
3.2. Tensile Test. The stress-strai
- Page 443 and 444:
Figure 2: Three point bending set u
- Page 445 and 446:
Figure 3: Stress-strain curves obta
- Page 447 and 448:
4. Tensile and Bending Behaviour Th
- Page 449 and 450:
5. Acoustic Emission Monitoring For
- Page 451 and 452:
Figure 5: Normal stress (MPa) on th
- Page 453 and 454:
Figure 6: Average frequency (AF) fo
- Page 455 and 456:
Up to the fracture moment the AF de
- Page 457 and 458:
This is due to the common damage me
- Page 459 and 460:
Results concerning the arch geometr
- Page 461 and 462:
It is thus confirmed that, for the
- Page 463 and 464:
7. Conclusions The present study di
- Page 465:
Reading More Charlie Chong/ Fion Zh
- Page 468 and 469:
Charlie Chong/ Fion Zhang
- Page 470:
Good Luck! Charlie Chong/ Fion Zhan