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ASTM E756-04e1

(Test Method)

Standard Test Method for Measuring Vibration-Damping Properties of Materials

Standard Test Method for Measuring Vibration-Damping Properties of Materials

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1.1 This test method measures the vibration-damping properties of materials: the loss factor, η, and Young's modulus, E, or the shear modulus, G. Accurate over a frequency range of 50 to 5000 Hz and over the useful temperature range of the material, this method is useful in testing materials that have application in structural vibration, building acoustics, and the control of audible noise. Such materials include metals, enamels, ceramics, rubbers, plastics, reinforced epoxy matrices, and woods that can be formed to cantilever beam test specimen configurations.
1.2 This standard does not purport to address all the safety concerns, if any, associated with its use. It is the responsibility of the user of this standard to establish appropriate safety and health practices and determine the applicability of regulatory limitations prior to use.

General Information

Status
Historical
Publication Date
31-Dec-2003
ICS
91.120.20 - Acoustics in building. Sound insulation
Technical Committee
E33 - Building and Environmental Acoustics
Drafting Committee
E33.03 - Sound Transmission
Current Stage
Ref Project

Relations

Replaces
ASTM E756-04 - Standard Test Method for Measuring Vibration-Damping Properties of Materials
Effective Date
01-Jan-2004
Replaced By
ASTM E756-05 - Standard Test Method for Measuring Vibration-Damping Properties of Materials
Effective Date
01-Oct-2005
Referred By
ASTM E2963-22 - Standard Test Method for Laboratory Measurement of Acoustical Effectiveness of Ship Noise Treatments Laboratory Measurement of Acoustical Effectiveness for Marine Bulkhead and Deck Treatments
Effective Date
01-Jan-2004
Referred By
ASTM C634-22 - Standard Terminology Relating to Building and Environmental Acoustics
Effective Date
01-Jan-2004

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ASTM E756-04e1 - Standard Test Method for Measuring Vibration-Damping Properties of MaterialsASTM E756-04e1 - Standard Test Method for Measuring Vibration-Damping Properties of Materials
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ASTM E756-04e1 - Standard Test Method for Measuring Vibration-Damping Properties of Materials
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NOTICE: This standard has either been superseded and replaced by a new version or withdrawn.
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e1
Designation:E756–04
Standard Test Method for
1
Measuring Vibration-Damping Properties of Materials
This standard is issued under the fixed designation E 756; 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
e NOTE—Equation X3.3 was editorially corrected in February 2005.
1. Scope material to the structure’s surface so that energy is dissipated
through cyclic deformation of the damping material, primarily
1.1 This test method measures the vibration-damping prop-
in tension-compression.
erties of materials: the loss factor, h, andYoung’s modulus, E,
3.1.2 constrained-layer (shear) damper—a treatment to
ortheshearmodulus, G.Accurateoverafrequencyrangeof50
control the vibration of a structure by bonding a layer of
to 5000 Hz and over the useful temperature range of the
damping material between the structure’s surface and an
material, this method is useful in testing materials that have
additional elastic layer (that is, the constraining layer), whose
application in structural vibration, building acoustics, and the
relativestiffnessisgreaterthanthatofthedampingmaterial,so
control of audible noise. Such materials include metals, enam-
that energy is dissipated through cyclic deformation of the
els, ceramics, rubbers, plastics, reinforced epoxy matrices, and
damping material, primarily in shear.
woods that can be formed to cantilever beam test specimen
3.2 Definitions of Terms Specific to This Standard:
configurations.
3.2.1 glassy region of a damping material—a temperature
1.2 This standard does not purport to address all the safety
region where a damping material is characterized by a rela-
concerns, if any, associated with its use. It is the responsibility
tively high modulus and a loss factor that increases from
of the user of this standard to establish appropriate safety and
extremely low to moderate as temperature increases (see Fig.
health practices and determine the applicability of regulatory
1).
limitations prior to use.
3.2.2 rubbery region of a damping material—a temperature
2. Referenced Documents region where a damping material is characterized by a rela-
2
tively low modulus and a loss factor that decreases from
2.1 ASTM Standard:
moderate to low as temperature increases (see Fig. 1).
E 548 GuideforGeneralCriteriaUsedforEvaluatingLabo-
3.2.3 transition region of a damping material—a tempera-
ratory Competence
ture region between the glassy region and the rubbery region
2.2 ANSI Standard:
where a damping material is characterized by the loss factor
S2.9 Nomenclature for Specifying Damping Properties of
3
passing through a maximum and the modulus rapidly decreas-
Materials
ing as temperature increases (see Fig. 1).
3. Terminology
3.3 Symbols—The symbols used in the development of the
equations in this method are as follows (other symbols will be
3.1 Definitions—Except for the terms listed below, ANSI
introduced and defined more conveniently in the text):
S2.9 defines the terms used in this test method.
3.1.1 free-layer (extensional) damper—a treatment to con-
trol the vibration of a structural by bonding a layer of damping
E = Young’s modulus of uniform beam, Pa
h = loss factor of uniform beam, dimensionless
E = Young’s modulus of damping material, Pa
1
1
This test method is under the jurisdiction of ASTM Committee E33 on
h = loss factor of damping material, dimensionless
1
EnvironmentalAcousticsandisthedirectresponsibilityofSubcommitteeE33.03on
G = shear modulus of damping material, Pa
Sound Transmission.
1
Current edition approved April 1, 2004. Published May 2004. Originally
approved in 1980. Last Previous edition approved in 1998 as E 756–98.
4. Summary of Method
2
For referenced ASTM standards, visit the ASTM website, www.astm.org, or
4.1 The configuration of the cantilever beam test specimen
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 is selected based on the type of damping material to be tested
the ASTM website.
and the damping properties that are desired. Fig. 2 shows four
3
Available from America National Standards Institute, 1430 Broadway, New
York, NY 10018.
Copyright © ASTM International, 100 Barr Harbor Drive, PO Box C700, West Conshohocken, PA 19428-2959, United States.
1

---------------------- Page: 1 ----------------------
e1
E756–04
tests (see Section 10.2.1), and the results of the composite
beam tests (see Sections 10.2.2 and 10.2.3).
4.1.3 The process to obtain the shear damping properties of
non–self-supporting damping materials is similar to the two
step proces
...

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3.2.4.1 Discussion—The mandatory language of section 3.2.4 is consistent with the mandatory language from §E2 of Form and Style for ASTM Standards (April 2020) and with the ASTM Committee E33 bylaws in place when this standard was published; it reflects a situation that exists, it does not prescribe anything.  
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1.1 This terminology covers terms, related definitions, and descriptions of terms used or likely to be used in building and environmental acoustics standards. Definitions of terms are special-purpose definitions that are consistent with the standard definitions but are written to ensure that a specific building and environmental acoustics standard is properly understood and precisely interpreted. The primary focus of this document is upon terms, definitions and descriptions found within standards under the jurisdiction of ASTM Committee E33; however, terms, definitions and descriptions that are of general interest to the field of acoustics are also included.  
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5.1 The specific airflow resistance of an acoustical material is one of the properties that determine its sound-absorptive and sound-transmitting properties. Measurement of specific airflow resistance is useful during product development, for quality control during manufacture, and for specification purposes.  
5.2 Valid measurements are made only in the region of laminar airflow where, aside from random measurement errors, the airflow resistance (R = P/U) is constant. When the airflow is turbulent, the apparent airflow resistance increases with an increase of volume velocity and the term “airflow resistance” does not apply.  
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1.1 This test method covers the measurement of airflow resistance and the related measurements of specific airflow resistance and airflow resistivity of porous materials that can be used for the absorption and attenuation of sound. Materials cover a range from thick boards or blankets to thin mats, fabrics, papers, and screens. When the material is anisotropic, provision is made for measurements along different axes of the specimen.  
1.2 This test method is designed for the measurement of values of specific airflow resistance ranging from 100 to 10 000 mks rayls (Pa·s/m) with linear airflow velocities ranging from 0.5 mm/s to 50 mm/s and pressure differences across the specimen ranging from 0.1 Pa to 250 Pa. The upper limit of this range of linear airflow velocities is a point at which the airflow through most porous materials is in partial or complete transition from laminar to turbulent flow.  
1.3 A procedure for accrediting a laboratory for the purposes of this test method is given in Annex A1.  
1.4 The values stated in SI units are to be regarded as standard. No other units of measurement are included in this standard.  
1.4.1 Table 1 is provided for user to convert into cgs units.    
cgs acoustic ohm  
mks acoustic ohm (Pa·s/m3)  
105  
cgs rayl  
mks rayl (Pa·s/m)  
10    
cgs rayl/cm  
mks rayl/m (Pa·s/m2)  
103  
cgs rayl/in.  
mks rayl/m (Pa·s/m2)  
394  
mks rayl/in.  
mks rayl/m (Pa·s/m2)  
39.4  
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1.2 The values stated in SI units are to be regarded as standard. No other units of measurement are included in this standard.  
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Standard Classification for Acoustically Absorptive Materials Applied by Trowel or Spray

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    sale 15% off
  • Standard
    4 pages
    English language
    sale 15% off