ASTM D5279-21
(Test Method)Standard Test Method for Plastics: Dynamic Mechanical Properties: In Torsion
Standard Test Method for Plastics: Dynamic Mechanical Properties: In Torsion
SIGNIFICANCE AND USE
5.1 This test method provides a simple means of characterizing the thermomechanical behavior of plastics material. The data obtained may be used for quality control, research and development, and establishment of optimum processing conditions.
5.2 Dynamic mechanical testing provides a sensitive method for determining thermomechanical characteristics by measuring the elastic and loss moduli as a function of frequency, temperature, or time. Plots of moduli and tan delta of a material versus temperature provide graphical representations indicative of physical and mechanical properties, effectiveness of cure (thermosetting resin system), and damping behavior under specified conditions.
5.3 This test method can be used to assess
5.3.1 The modulus as a function of temperature,
5.3.2 The modulus as a function of frequency,
5.3.3 The effects of processing treatment, including orientation,
5.3.4 Relative resin behavioral properties, including cure and damping,
5.3.5 The effects of substrate types and orientation (fabrication) on elastic modulus, and
5.3.6 The effects of formulation additives that might affect processability or performance.
5.4 Before proceeding with this test method, reference should be made to the specification of the material being tested. Any test specimen preparation, conditioning, dimensions, or testing parameters, or combination thereof, covered in the relevant ASTM materials specification shall take precedence over those mentioned in this test method. If there are no relevant ASTM materials specifications, then the default conditions apply.
SCOPE
1.1 This test method covers the use of dynamic mechanical instrumentation for gathering and reporting the viscoelastic properties of thermoplastic and thermosetting resins and composite systems in the form of rectangular specimens molded directly or cut from sheets, plates, or molded shapes. The torsional data generated may be used to identify the thermomechanical properties of a plastics material or composition.
1.2 This test method is intended to provide means for determining the torsional modulus of plastics as a function of temperature using nonresonant forced-vibration techniques, as outlined in Practice D4065. Plots of the elastic (storage), loss (viscous), and complex moduli and tan delta, as a function of frequency, time, or temperature are indicative of significant transitions in the thermomechanical performance of the polymeric material system.
1.3 This test method is valid for a wide range of frequencies, typically from 0.01 to 100 Hz.
1.4 Apparent discrepancies may arise in results obtained under differing experimental conditions. These apparent differences from results observed in another study can usually be reconciled without changing the observed data by reporting in full (as described in this test method) the conditions under which the data were obtained.
1.5 Test data obtained by this test method are relevant and appropriate for use in engineering design.
1.6 The values stated in SI units are to be regarded as standard.
1.7 This standard does not purport to address all of the safety concerns, if any, associated with its use. It is the responsibility of the user of this standard to establish appropriate safety, health, and environmental practices and determine the applicability of regulatory limitations prior to use.
Note 1: This test method is equivalent to ISO 6721, Part 7.
1.8 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.
General Information
- Status
- Published
- Publication Date
- 30-Jun-2021
- Technical Committee
- D20 - Plastics
- Drafting Committee
- D20.10 - Mechanical Properties
Relations
- Effective Date
- 01-Nov-2008
- Effective Date
- 01-Mar-2007
- Effective Date
- 01-Dec-2006
- Effective Date
- 01-Nov-2005
- Effective Date
- 10-Sep-2001
- Effective Date
- 10-Sep-2001
- Effective Date
- 10-Sep-2001
- Effective Date
- 10-Sep-2001
- Effective Date
- 10-Nov-2000
Overview
ASTM D5279-21: Standard Test Method for Plastics – Dynamic Mechanical Properties in Torsion specifies procedures for measuring the dynamic mechanical properties of plastics, including thermoplastic and thermosetting resins as well as composite systems. This standard outlines methods for determining viscoelastic properties under torsional loading, providing key data on how plastics behave when subjected to varying frequencies and temperatures.
Dynamic mechanical analysis (DMA) using torsion tests plays a crucial role in characterizing the elasticity, damping, and other thermomechanical behaviors of plastic materials. It is widely utilized in quality control, research and development, and for establishing optimal processing conditions for both material development and engineering design.
Key Topics
- Dynamic Mechanical Testing: Evaluation of plastics’ torsional modulus using nonresonant forced-vibration techniques, allowing assessment over a wide frequency range (0.01 to 100 Hz).
- Viscoelastic Properties: Measurement and reporting of the elastic (storage) modulus, loss (viscous) modulus, complex modulus, and tan delta as a function of frequency, temperature, or time.
- Graphical Data Analysis: Plots of modulus values and tan delta versus temperature and frequency provide vital insights into transitions and behavioral changes in plastics.
- Test Specimen Preparation: Use of rectangular specimens molded directly or cut from larger shapes; test conditions must align with relevant ASTM material specifications where applicable.
- Data Reporting: Comprehensive reporting of specimen characteristics, test parameters (such as frequency, amplitude, and temperature), and test outcomes is critical for reproducibility and engineering applications.
Applications
ASTM D5279-21 is applied in numerous scenarios where understanding a plastic’s performance under dynamic mechanical loads is critical:
- Quality Control: Ensuring batch consistency and adherence to material specifications by monitoring dynamic mechanical responses.
- Research & Development: Supporting material selection, formulation improvements, and innovation in plastics by evaluating thermomechanical properties.
- Process Optimization: Identifying the effects of processing conditions, additive formulations, orientation, and fabrication techniques on the elasticity and damping properties of plastics.
- Product Design & Engineering: Providing reliable data for engineering calculations, allowing designers to account for material behavior across temperature and frequency ranges relevant to end-use environments.
- Assessment of Curing & Damping: Specifically useful for thermosetting resins, helping to gauge the effectiveness of cure and the damping characteristics of final products.
Industries utilizing this standard include automotive, aerospace, electronics, consumer goods, and any sector that manufactures or uses polymers and composites.
Related Standards
- ASTM D4065: Practice for Plastics – Dynamic Mechanical Properties: Determination and Report of Procedures, which details the general framework for DMA tests.
- ASTM D4092: Terminology for Plastics – Dynamic Mechanical Properties, providing definitions essential to DMA.
- ASTM D618: Practice for Conditioning Plastics for Testing, ensuring consistent pre-test material conditioning.
- ISO 6721-7: International standard providing an equivalent method for dynamic mechanical analysis in torsion.
- Other Engineering Standards: Measures such as ISO and ASTM protocols relevant to dynamic analysis and mechanical testing of polymers.
By using ASTM D5279-21, professionals can generate reproducible, meaningful data on the dynamic torsional behavior of plastics, enabling informed decisions in material selection, product development, and ongoing quality assurance. This standard is essential for anyone involved with plastics engineering, testing laboratories, and materials research.
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Frequently Asked Questions
ASTM D5279-21 is a standard published by ASTM International. Its full title is "Standard Test Method for Plastics: Dynamic Mechanical Properties: In Torsion". This standard covers: SIGNIFICANCE AND USE 5.1 This test method provides a simple means of characterizing the thermomechanical behavior of plastics material. The data obtained may be used for quality control, research and development, and establishment of optimum processing conditions. 5.2 Dynamic mechanical testing provides a sensitive method for determining thermomechanical characteristics by measuring the elastic and loss moduli as a function of frequency, temperature, or time. Plots of moduli and tan delta of a material versus temperature provide graphical representations indicative of physical and mechanical properties, effectiveness of cure (thermosetting resin system), and damping behavior under specified conditions. 5.3 This test method can be used to assess 5.3.1 The modulus as a function of temperature, 5.3.2 The modulus as a function of frequency, 5.3.3 The effects of processing treatment, including orientation, 5.3.4 Relative resin behavioral properties, including cure and damping, 5.3.5 The effects of substrate types and orientation (fabrication) on elastic modulus, and 5.3.6 The effects of formulation additives that might affect processability or performance. 5.4 Before proceeding with this test method, reference should be made to the specification of the material being tested. Any test specimen preparation, conditioning, dimensions, or testing parameters, or combination thereof, covered in the relevant ASTM materials specification shall take precedence over those mentioned in this test method. If there are no relevant ASTM materials specifications, then the default conditions apply. SCOPE 1.1 This test method covers the use of dynamic mechanical instrumentation for gathering and reporting the viscoelastic properties of thermoplastic and thermosetting resins and composite systems in the form of rectangular specimens molded directly or cut from sheets, plates, or molded shapes. The torsional data generated may be used to identify the thermomechanical properties of a plastics material or composition. 1.2 This test method is intended to provide means for determining the torsional modulus of plastics as a function of temperature using nonresonant forced-vibration techniques, as outlined in Practice D4065. Plots of the elastic (storage), loss (viscous), and complex moduli and tan delta, as a function of frequency, time, or temperature are indicative of significant transitions in the thermomechanical performance of the polymeric material system. 1.3 This test method is valid for a wide range of frequencies, typically from 0.01 to 100 Hz. 1.4 Apparent discrepancies may arise in results obtained under differing experimental conditions. These apparent differences from results observed in another study can usually be reconciled without changing the observed data by reporting in full (as described in this test method) the conditions under which the data were obtained. 1.5 Test data obtained by this test method are relevant and appropriate for use in engineering design. 1.6 The values stated in SI units are to be regarded as standard. 1.7 This standard does not purport to address all of the safety concerns, if any, associated with its use. It is the responsibility of the user of this standard to establish appropriate safety, health, and environmental practices and determine the applicability of regulatory limitations prior to use. Note 1: This test method is equivalent to ISO 6721, Part 7. 1.8 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.
SIGNIFICANCE AND USE 5.1 This test method provides a simple means of characterizing the thermomechanical behavior of plastics material. The data obtained may be used for quality control, research and development, and establishment of optimum processing conditions. 5.2 Dynamic mechanical testing provides a sensitive method for determining thermomechanical characteristics by measuring the elastic and loss moduli as a function of frequency, temperature, or time. Plots of moduli and tan delta of a material versus temperature provide graphical representations indicative of physical and mechanical properties, effectiveness of cure (thermosetting resin system), and damping behavior under specified conditions. 5.3 This test method can be used to assess 5.3.1 The modulus as a function of temperature, 5.3.2 The modulus as a function of frequency, 5.3.3 The effects of processing treatment, including orientation, 5.3.4 Relative resin behavioral properties, including cure and damping, 5.3.5 The effects of substrate types and orientation (fabrication) on elastic modulus, and 5.3.6 The effects of formulation additives that might affect processability or performance. 5.4 Before proceeding with this test method, reference should be made to the specification of the material being tested. Any test specimen preparation, conditioning, dimensions, or testing parameters, or combination thereof, covered in the relevant ASTM materials specification shall take precedence over those mentioned in this test method. If there are no relevant ASTM materials specifications, then the default conditions apply. SCOPE 1.1 This test method covers the use of dynamic mechanical instrumentation for gathering and reporting the viscoelastic properties of thermoplastic and thermosetting resins and composite systems in the form of rectangular specimens molded directly or cut from sheets, plates, or molded shapes. The torsional data generated may be used to identify the thermomechanical properties of a plastics material or composition. 1.2 This test method is intended to provide means for determining the torsional modulus of plastics as a function of temperature using nonresonant forced-vibration techniques, as outlined in Practice D4065. Plots of the elastic (storage), loss (viscous), and complex moduli and tan delta, as a function of frequency, time, or temperature are indicative of significant transitions in the thermomechanical performance of the polymeric material system. 1.3 This test method is valid for a wide range of frequencies, typically from 0.01 to 100 Hz. 1.4 Apparent discrepancies may arise in results obtained under differing experimental conditions. These apparent differences from results observed in another study can usually be reconciled without changing the observed data by reporting in full (as described in this test method) the conditions under which the data were obtained. 1.5 Test data obtained by this test method are relevant and appropriate for use in engineering design. 1.6 The values stated in SI units are to be regarded as standard. 1.7 This standard does not purport to address all of the safety concerns, if any, associated with its use. It is the responsibility of the user of this standard to establish appropriate safety, health, and environmental practices and determine the applicability of regulatory limitations prior to use. Note 1: This test method is equivalent to ISO 6721, Part 7. 1.8 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.
ASTM D5279-21 is classified under the following ICS (International Classification for Standards) categories: 83.080.01 - Plastics in general. The ICS classification helps identify the subject area and facilitates finding related standards.
ASTM D5279-21 has the following relationships with other standards: It is inter standard links to ASTM D618-08, ASTM D4092-07, ASTM D4065-06, ASTM D618-05, ASTM D4065-95, ASTM D4065-01, ASTM D4092-96, ASTM D4092-01, ASTM D618-00. Understanding these relationships helps ensure you are using the most current and applicable version of the standard.
ASTM D5279-21 is available in PDF format for immediate download after purchase. The document can be added to your cart and obtained through the secure checkout process. Digital delivery ensures instant access to the complete standard document.
Standards Content (Sample)
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.
Designation: D5279 − 21
Standard Test Method for
Plastics: Dynamic Mechanical Properties: In Torsion
This standard is issued under the fixed designation D5279; 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.
1. Scope* ization established in the Decision on Principles for the
Development of International Standards, Guides and Recom-
1.1 This test method covers the use of dynamic mechanical
mendations issued by the World Trade Organization Technical
instrumentation for gathering and reporting the viscoelastic
Barriers to Trade (TBT) Committee.
properties of thermoplastic and thermosetting resins and com-
posite systems in the form of rectangular specimens molded
2. Referenced Documents
directly or cut from sheets, plates, or molded shapes. The
2.1 ASTM Standards:
torsional data generated may be used to identify the thermo-
D618 Practice for Conditioning Plastics for Testing
mechanical properties of a plastics material or composition.
D4065 Practice for Plastics: Dynamic Mechanical Proper-
1.2 This test method is intended to provide means for
ties: Determination and Report of Procedures
determining the torsional modulus of plastics as a function of
D4092 Terminology for Plastics: Dynamic Mechanical
temperature using nonresonant forced-vibration techniques, as
Properties
outlined in Practice D4065. Plots of the elastic (storage), loss
(viscous), and complex moduli and tan delta, as a function of
3. Terminology
frequency, time, or temperature are indicative of significant
3.1 For definitions applicable to this test method, refer to
transitions in the thermomechanical performance of the poly-
Terminology D4092.
meric material system.
4. Summary of Test Method
1.3 Thistestmethodisvalidforawiderangeoffrequencies,
typically from 0.01 to 100 Hz.
4.1 This test method covers the determination of the shear
modulus of plastics using dynamic mechanical techniques. A
1.4 Apparent discrepancies may arise in results obtained
under differing experimental conditions. These apparent differ- test specimen of rectangular cross section is tested in dynamic
torsion. The specimen is gripped longitudinally between two
ences from results observed in another study can usually be
reconciled without changing the observed data by reporting in clamps. The specimen of known geometry is placed in me-
full (as described in this test method) the conditions under chanical torsional displacement at either a fixed frequency, or
which the data were obtained. variable frequencies at either isothermal conditions, or with a
linear temperature increase. The elastic or loss modulus, or
1.5 Test data obtained by this test method are relevant and
both, of the polymeric material system are measured in torsion.
appropriate for use in engineering design.
1.6 The values stated in SI units are to be regarded as
5. Significance and Use
standard.
5.1 This test method provides a simple means of character-
1.7 This standard does not purport to address all of the
izing the thermomechanical behavior of plastics material. The
safety concerns, if any, associated with its use. It is the
data obtained may be used for quality control, research and
responsibility of the user of this standard to establish appro-
development, and establishment of optimum processing con-
priate safety, health, and environmental practices and deter-
ditions.
mine the applicability of regulatory limitations prior to use.
5.2 Dynamic mechanical testing provides a sensitive
NOTE 1—This test method is equivalent to ISO 6721, Part 7. method for determining thermomechanical characteristics by
measuring the elastic and loss moduli as a function of
1.8 This international standard was developed in accor-
dance with internationally recognized principles on standard-
For referenced ASTM standards, visit the ASTM website, www.astm.org, or
This test method is under the jurisdiction ofASTM Committee D20 on Plastics contact ASTM Customer Service at service@astm.org. For Annual Book of ASTM
and is the direct responsibility of Subcommittee D20.10 on Mechanical Properties. Standards volume information, refer to the standard’s Document Summary page on
Current edition approved July 1, 2021. Published August 2021. Originally the ASTM website.
approved in 1992. Last previous edition approved in 2013 as D5279 - 13. DOI: The particular method for measurement of the elastic and loss moduli and tan
10.1520/D5279-21. delta depends upon the individual instrument’s operating principles.
*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
D5279 − 21
frequency, temperature, or time. Plots of moduli and tan delta deformation (strain), frequency, and temperature. Temperature
of a material versus temperature provide graphical representa- should be measurable with a precision of 61°C, frequency to
tions indicative of physical and mechanical properties, effec- 61 %, and force to 61%.
tiveness of cure (thermosetting resin system), and damping 7.2.6 Temperature Controller and Oven—A device for con-
behavior under specified conditions. trolling the temperature, either by heating (in steps or ramps),
cooling (in steps or ramps), maintaining a constant specimen
5.3 This test method can be used to assess
environment, or a combination thereof.Atemperature control-
5.3.1 The modulus as a function of temperature,
ler should be sufficiently stable to permit measurement of
5.3.2 The modulus as a function of frequency,
environmental chamber temperature to within 1°C.
5.3.3 The effects of processing treatment, including
orientation, 7.3 Nitrogen or other inert gas supply for purging purposes.
5.3.4 Relative resin behavioral properties, including cure
8. Test Specimens
and damping,
5.3.5 The effects of substrate types and orientation (fabri-
8.1 Any rectangular specimen, representative of the mate-
cation) on elastic modulus, and
rial being tested and within the fixturing capabilities of the
5.3.6 The effects of formulation additives that might affect
specific test instrument employed, shall be used so long as an
processability or performance.
accurate description of the specimen is clearly stated in the test
report.
5.4 Before proceeding with this test method, reference
shouldbemadetothespecificationofthematerialbeingtested.
NOTE 2—The test specimens may be cut from sheets, plates, or molded
Any test specimen preparation, conditioning, dimensions, or
shapes, or may be molded to the desired finished dimensions.
testing parameters, or combination thereof, covered in the
9. Calibration
relevant ASTM materials specification shall take precedence
over those mentioned in this test method. If there are no
9.1 Calibratetheinstrumentusingproceduresrecommended
relevant ASTM materials specifications, then the default con-
by the manufacturer.
ditions apply.
10. Conditioning
6. Interferences
10.1 Conditioning—Condition the test specimens at 23.0 6
6.1 Since small test specimen geometries are used, it is
2.0°C and 50 6 5 % relative humidity for not less than 40 h
essential that the specimens be representative of the material
prior to testing in accordance with Procedure A of Practice
being tested.
D618, unless otherwise specified by the contract or relevant
7. Apparatus
material specification.
7.1 The function of the apparatu
...
This document is not an ASTM standard and is intended only to provide the user of an ASTM standard an indication of what changes have been made to the previous version. Because
it may not be technically possible to adequately depict all changes accurately, ASTM recommends that users consult prior editions as appropriate. In all cases only the current version
of the standard as published by ASTM is to be considered the official document.
Designation: D5279 − 13 D5279 − 21
Standard Test Method for
Plastics: Dynamic Mechanical Properties: In Torsion
This standard is issued under the fixed designation D5279; 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.
1. Scope*
1.1 This test method covers the use of dynamic mechanical instrumentation for gathering and reporting the viscoelastic properties
of thermoplastic and thermosetting resins and composite systems in the form of rectangular specimens molded directly or cut from
sheets, plates, or molded shapes. The torsional data generated may be used to identify the thermomechanical properties of a plastics
material or composition.
1.2 This test method is intended to provide means for determining the torsional modulus of plastics as a function of temperature
using nonresonant forced-vibration techniques, as outlined in Practice D4065. Plots of the elastic (storage), loss (viscous), and
complex moduli and tan delta, as a function of frequency, time, or temperature are indicative of significant transitions in the
thermomechanical performance of the polymeric material system.
1.3 This test method is valid for a wide range of frequencies, typically from 0.01 to 100 Hz.
1.4 Apparent discrepancies may arise in results obtained under differing experimental conditions. These apparent differences from
results observed in another study can usually be reconciled without changing the observed data by reporting in full (as described
in this test method) the conditions under which the data were obtained.
1.5 Test data obtained by this test method are relevant and appropriate for use in engineering design.
1.6 The values stated in SI units are to be regarded as standard.
1.7 This standard does not purport to address all of the safety concerns, if any, associated with its use. It is the responsibility
of the user of this standard to establish appropriate safety safety, health, and healthenvironmental practices and determine the
applicability of regulatory limitations prior to use.
NOTE 1—This test method is equivalent to ISO 6721, Part 7.
1.8 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.
This test method is under the jurisdiction of ASTM Committee D20 on Plastics and is the direct responsibility of Subcommittee D20.10 on Mechanical Properties.
Current edition approved Sept. 1, 2013July 1, 2021. Published Septmeber 2013August 2021. Originally approved in 1992. Last previous edition approved in 20082013
as D5279 - 08.D5279 - 13. DOI: 10.1520/D5279-13.10.1520/D5279-21.
*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
D5279 − 21
2. Referenced Documents
2.1 ASTM Standards:
D618 Practice for Conditioning Plastics for Testing
D4065 Practice for Plastics: Dynamic Mechanical Properties: Determination and Report of Procedures
D4092 Terminology for Plastics: Dynamic Mechanical Properties
3. Terminology
3.1 For definitions applicable to this test method, refer to Terminology D4092.
4. Summary of Test Method
4.1 This test method covers the determination of the shear modulus of plastics using dynamic mechanical techniques. A test
specimen of rectangular cross section is tested in dynamic torsion. The specimen is gripped longitudinally between two clamps.
The specimen of known geometry is placed in mechanical torsional displacement at either a fixed frequency, or variable
frequencies at either isothermal conditions, or with a linear temperature increase. The elastic or loss modulus, or both, of the
polymeric material system are measured in torsion.
5. Significance and Use
5.1 This test method provides a simple means of characterizing the thermomechanical behavior of plastics materials using very
small amounts of material. The data obtained may be used for quality control, research and development, and establishment of
optimum processing conditions.
5.2 Dynamic mechanical testing provides a sensitive method for determining thermomechanical characteristics by measuring the
elastic and loss moduli as a function of frequency, temperature, or time. Plots of moduli and tan delta of a material versus
temperature provide graphical representations indicative of functional physical and mechanical properties, effectiveness of cure
(thermosetting resin system), and damping behavior under specified conditions.
5.3 This test method can be used to assess
5.3.1 The modulus as a function of temperature,
5.3.2 The modulus as a function of frequency,
5.3.3 The effects of processing treatment, including orientation,
5.3.4 Relative resin behavioral properties, including cure and damping,
5.3.5 The effects of substrate types and orientation (fabrication) on elastic modulus, and
5.3.6 The effects of formulation additives that might affect processability or performance.
5.4 Before proceeding with this test method, reference should be made to the specification of the material being tested. Any test
specimen preparation, conditioning, dimensions, or testing parameters, or combination thereof, covered in the relevant ASTM
materials specification shall take precedence over those mentioned in this test method. If there are no relevant ASTM materials
specifications, then the default conditions apply.
6. Interferences
6.1 Since small test specimen geometries are used, it is essential that the specimens be representative of the material being tested.
For referenced ASTM standards, visit the ASTM website, www.astm.org, or 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.
The particular method for measurement of the elastic and loss moduli and tan delta depends upon the individual instrument’s operating principles.
D5279 − 21
7. Apparatus
7.1 The function of the apparatus is to hold a rectangular test specimen so that the material acts as the elastic and dissipative
element in a mechanically driven torsional system. Dynamic mechanical instruments operate at a forced, constant amplitude, and
either at a fixed frequency, or variable frequencies.
7.2 The apparatus shall consist of the following:
7.2.1 Fixed Member—A fixed or essentially stationary member carrying one grip.
7.2.2 Movable Member—A movable member carrying a second grip.
7.2.3 Grips—Grips for holding the test specimen between the fixed member and the movable member. The grips shall be
mechanically aligned, that is, they shall be attached to the fixed and movable member, respectively, in such a manner that they will
move into alignment as soon as any load is applied, so that the long axis of the test specimen will coincide with the direction of
the applied pull through the center line of the grip assembly.
7.2.3.1 The test specimen shall be held in such a way that slippage relative to the grips is minimized.
7.2.4 Deformation (Strain Device)—A device for applying a continuous linear deformation (strain) to the specimen. In the
force-displacement device the deformation (strain) is applied and then released. (See Table 1 of Practice D4065.)
7.2.5 Detectors—Devices for determining dependent an
...
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