ASTM E664/E664M-15(2020)e1

This international standard was developed in accordance with internationally recognized principles on standardization established in the Decision on Principles for the
Development of International Standards, Guides and Recommendations issued by the World Trade Organization Technical Barriers to Trade (TBT) Committee.
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Designation: E664/E664M − 15 (Reapproved 2020)
Standard Practice for the
Measurement of the Apparent Attenuation of Longitudinal
Ultrasonic Waves by Immersion Method
This standard is issued under the fixed designation E664/E664M; 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 (´) indicates an editorial change since the last revision or reapproval.
ε NOTE—Editorial changes were made to Section 2 in August 2020.
1. Scope* 2. Referenced Documents
1.1 This practice describes a procedure for measuring the 2.1 ASTM Standards:
apparent attenuation of ultrasound in materials or components E317 Practice for Evaluating Performance Characteristics of
with flat, parallel surfaces using conventional pulse-echo Ultrasonic Pulse-Echo Testing Instruments and Systems
ultrasonic flaw detection equipment in which reflected indica- without the Use of Electronic Measurement Instruments
tions are displayed in an A-scan presentation. E543 Specification for Agencies Performing Nondestructive
Testing
1.2 The measurement procedure is readily adaptable for the
E1316 Terminology for Nondestructive Examinations
determination of relative attenuation between materials. For
2.2 ASNT Documents:
absolute (true) attenuation measurements, indicative of the
SNT-TC-1A Recommended for Personnel Qualification and
intrinsic nature of the material, it is necessary to correct for
Certification of Nondestructive Testing Personnel
specimen geometry, sound beam divergence, instrumentation,
ANSI/ASNT CP-189 ASNT Standard for Qualification and
andproceduraleffects.Theseresultscanbeobtainedwithmore
Certification of Nondestructive Testing Personnel
specialized ultrasonic equipment and techniques.
2.3 AIA Standard:
1.3 The values stated in either SI units or inch-pound units
NAS-410 NAS Certification and Qualification of Nonde-
are to be regarded separately as standard. The values stated in
structive Personnel (Quality Assurance Committee)
each system may not be exact equivalents; therefore, each
2.4 ISO Standard:
system shall be used independently of the other. Combining
ISO 9712 Non-destructive Testing—Qualification and Cer-
values from the two systems may result in non-conformance
tification of NDT Personnel
with the standard.
1.4 This standard does not purport to address all of the
3. Terminology
safety concerns, if any, associated with its use. It is the
3.1 Definitions—For definitions of terms used in this
responsibility of the user of this standard to establish appro-
practice, see Terminology E1316.
priate safety, health, and environmental practices and deter-
mine the applicability of regulatory limitations prior to use.
4. Summary of Practice
1.5 This international standard was developed in accor-
4.1 This practice describes a procedure for determining
dance with internationally recognized principles on standard-
apparent attenuation by measuring the decay of multiple back
ization established in the Decision on Principles for the
Development of International Standards, Guides and Recom-
mendations issued by the World Trade Organization Technical 2
For referenced ASTM standards, visit the ASTM website, www.astm.org, or
Barriers to Trade (TBT) Committee. contact ASTM Customer Service at service@astm.org. For Annual Book of ASTM
Standards volume information, refer to the standard’s Document Summary page on
the ASTM website.
1 3
This practice is under the jurisdiction of ASTM Committee E07 on Nonde- AvailablefromAmericanSocietyforNondestructiveTesting(ASNT),P.O.Box
structive Testing and is the direct responsibility of Subcommittee E07.06 on 28518, 1711 Arlingate Ln., Columbus, OH 43228-0518, http://www.asnt.org.
Ultrasonic Method. Available from Aerospace Industries Association (AIA), 1000 Wilson Blvd.,
Current edition approved July 1, 2020. Published August 2020. Originally Suite 1700, Arlington, VA 22209, http://www.aia-aerospace.org.
approved in 1978. Last previous edition approved in 2015 as E664/E664M – 15. Available from International Organization for Standardization (ISO), 1, ch. de
DOI: 10.1520/E0664_E0664M-15R20E01. la Voie-Creuse, CP 56, CH-1211 Geneva 20, Switzerland, http://www.iso.org.
*A Summary of Changes section appears at the end of this standard
Copyright © ASTM International, 100 Barr Harbor Drive, PO Box C700, West Conshohocken, PA 19428-2959. United States
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E664/E664M − 15 (2020)
reflections of longitudinal ultrasonic waves introduced into 7. Apparatus
specimens with flat, parallel surfaces by the immersion tech-
7.1 Ultrasonic Flaw Detection System—A system capable
nique.
of generating, receiving, and displaying ultrasonic energy at
the frequency of interest. Display shall be an A-scan presen-
5. Significance and Use
tation.
5.1 The measurement of apparent attenuation in materials is
7.1.1 Performance Characteristics—The vertical linearity
useful in applications such as the comparison of heat treat-
limits shall be determined as specified in Practice E317. All
ments of different lots of material or the assessment of the
measurements shall be made only within the linear ranges of
degradation of materials due to environment.
the system.
5.2 Several different modes of wave vibration can be
7.2 Search Unit—The size and frequency should be deter-
propagated in solids. This practice is concerned with the
mined to suit the application, and only non-focused search
attenuation associated with longitudinal waves introduced into
units may be used.
the specimen by the immersion method.
7.3 Couplant—Normally water. See Terminology E1316.
5.3 This practice allows for the comparison of the apparent
attenuations of geometrically similar specimens.
7.4 Reference Block—The use of a reference block is
5.4 For the determination of apparent attenuation, the pro- suggested to evaluate the stability of the measurement system
cedures described herein are valid only for measurements in if measurements will be made over a period of time. The
the far field of the ultrasonic beam.
referenceblockshouldhaveacousticpropertiessimilartothose
of the examined material in the frequency range of interest.
6. Basis of Application
8. Specimen
6.1 The following items are subject to contractual agree-
ment between the parties using or referencing this standard.
8.1 Geometric Similarity—When comparing the apparent
6.2 Personnel Qualification
attenuations of two or more materials or components, the
6.2.1 If specified in the contract agreement, personnel per-
specimens used must be geometrically similar. They must be
forming examinations to this standard shall be qualified in flat and parallel within 0.008 in. [0.20 mm]/in. [2
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