ASTM E569-97

Designation: E 569 – 97 An American National Standard
Standard Practice for
Acoustic Emission Monitoring of Structures During
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Controlled Stimulation
This standard is issued under the fixed designation E 569; the number immediately following the designation indicates the year of
original adoption or, in the case of revision, the year of last revision. A number in parentheses indicates the year of last reapproval. A
superscript epsilon (e) indicates an editorial change since the last revision or reapproval.
1. Scope 3.2 Definitions of Terms Specific to this Standard:
3.2.1 AE activity—the presence of acoustic emission during
1.1 This practice provides guidelines for acoustic emission
a test.
(AE) examination or monitoring of structures, such as pressure
3.2.2 active source—one which exhibits increasing cumu-
vessels, piping systems, or other structures that can be stressed
lative AE activity with increasing or constant stimulus.
by mechanical or thermal means.
3.2.3 critically active source—one which exhibits an in-
1.2 The basic functions of an AE monitoring system are to
creasing rate of change of cumulative AE activity with increas-
detect, locate, and classify emission sources. Other methods of
ing or constant stimulus.
nondestructive testing (NDT) may be used to further evaluate
3.2.4 AE source intensity—average energy, counts or am-
the significance of acoustic emission sources.
plitude per hit.
1.3 This standard does not purport to address all of the
3.2.5 intense source—one in which the AE source intensity
safety concerns, if any, associated with its use. It is the
of an active source consistently exceeds, by a specified amount,
responsibility of the user of this standard to establish appro-
the average AE source intensity of active sources.
priate safety and health practices and determine the applica-
3.2.6 critically intense source—one in which the AE source
bility of regulatory limitations prior to use.
intensity consistently increases with increasing stimulus or
2. Referenced Documents with time under constant stimulus.
2.1 ASTM Standards:
4. Summary of Practice
E 650 Guide for Mounting Piezoelectric Acoustic Emission
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4.1 Acoustic emission examination of a structure usually
Sensors
requires application of a mechanical or thermal stimulus. Such
E 750 Practice for Characterizing Acoustic Emission Instru-
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stimulation produces changes in the stresses in the structure.
mentation
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During stimulation of a structure, AE from discontinuities
E 1316 Terminology for Nondestructive Examinations
(such as cracks and inclusions) and from other areas of stress
2.2 Other Documents:
concentration, or from other acoustic sources (such as leaks,
SNT-TC-1A Recommended Practice for Nondestructive
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loose parts, and structural motion) can be detected by an
Testing Personnel Qualification and Certification
instrumentation system, using sensors which, when stimulated
ANSI/ASNT CP-189 Standard for Qualification and Certi-
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by stress waves, generate electrical signals.
fication of Nondestructive Testing Personnel
4.2 In addition to immediate evaluation of the emissions
MIL-STD-410 Nondestructive Testing Personnel Qualifica-
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detected during the application of the stimulus, a permanent
tion and Certification
record of the number and location of emitting sources and the
3. Terminology
relative amount of AE detected from each source provides a
basis for comparison with sources detected during the test and
3.1 Definitions—Definitions of terms relating to acoustic
during subsequent stimulation.
emission may be found in Section B of Terminology E 1316.
5. Order Information
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5.1 If AE monitoring in accordance with this practice is
This practice is under the jurisdiction of ASTM Committee E-7 on Nonde-
structive Testing and is the direct responsibility of Subcommittee E07.04 on
performed as a service, the following items are subject to
Acoustic Emission.
agreement between the purchaser and supplier:
Current edition approved May 10, 1997. Published February 1998. Originally
5.1.1 Examination Area—Many applications will require an
published as E 569 – 76. Last previous edition E 569 – 85.
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Annual Book of ASTM Standards, Vol 03.03. arrangement of sensors such that all areas of the structure are
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Available from American Society for Nondestructive Testing, 1711 Arlingate
monitored. In other applications, only a portion of the structure
Plaza, PO Box 28518, Columbus, Ohio 43228-0518.
may require monitoring.
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Available from Standardization Documents Order Desk, Building 4 Section D,
5.1.2 Previous maximum vessel stresses or loads; vessel
700 Robbins Avenue, Philadelphia, PA 19111-5904, Attn: NPODS.
Copyright © ASTM, 100 Barr Harbor Drive, West Conshohocken, PA 19428-2959, United States.
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E 569
relaxation period, if any; the planned stimulation schedule, be below the ductile-brittle transition temperature of the
stimulation parameters, and AE monitoring period(s) (see pressure ves
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