A qualitative description of the sustained signal level produced by rapidly occurring acoustic emission events is the accepted term for:
burst emission.
acoustic emission signature.
acoustic emission signal.
continuous emission.
Attenuation of a wave is best defined by which statement?
A decrease in frequency with distance traveled.
A decrease in amplitude with distance traveled.
A decrease in wave speed with distance traveled.
A change in direction as a function of time.
The number of times the acoustic emission signal exceeds a preset threshold during any selected portion of a test is called the acoustic emission ______________.
response
count
count rate
energy
The most common frequency range of acoustic emission testing is:
10-15 kHz.
100-300 kHz.
500-750 kHz.
1-5 MHz.
Discontinuities that are not readily detectable by acoustic emission testing are:
leaks.
plastic deformation.
growing cracks.
rounded inclusions.
The total energy loss of a propagating wave is called:
scatter.
dispersion.
diffraction.
attenuation.
Hold periods at high loads during fiberglass-reinforced pressure (FRP) vessel examinations using ASME Article 11 are necessary to:
calculate the Felicity Ratio.
check for leaks.
monitor continued damage.
measure the Kaiser Ratio.
In acoustic emission testing per ASME Section V, Article 11, sensor spacing on fiberglass-reinforced pressure (FRP) vessels is governed by:
the test article temperature.
sensor diameter.
the type of couplant.
How can an examiner be assured that proper contact has been made between the sensor and the vessel?
Apply extra couplant around the sensor.
Use heavy-duty fasteners on sensors and cables.
Measure the peak amplitude response from a simulated acoustic emission source.
Use acoustic waveguides.
The source of the energy of the acoustic emission wave during crack growth is the:
acoustic emission sensor.
surface energy of the new crack.
elastic stress field in the structure.
power supply from the mainframe to the preamplifier.
Which of the following can be a significant source of background noise?
In-rushing fluid.
Wind.
Radio transmissions.
All of the above.
The elastic energy that is released by materials when they undergo deformation is called:
transformation.
acoustic emission.
brittle fracture.
isotrophy.
During loading, a metallic structure emits throughout the test period. When the load is reduced and then reapplied, no emissions are noted until the previous stress level was exceeded. This is an example of:
the Dunegan Corollary.
the Kaiser Effect
the Felicity Ratio
a Hsu-Nielsen source
The founder of modern acoustic emission technology was:
Conrad Earl Krieder.
Professor Firestone.
James C. Bolling
Josef Kaiser
