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ASTM E 328 : 2021

Current

Current

The latest, up-to-date edition.

Standard Test Methods for Stress Relaxation for Materials and Structures

Available format(s)

Hardcopy , PDF

Language(s)

English

Published date

08-02-2021

€61.92
Excluding VAT

Committee
E 28
DocumentType
Test Method
Pages
15
PublisherName
American Society for Testing and Materials
Status
Current
Supersedes

Note 1:The method of testing for the stress relaxation of plastics has been withdrawn from this standard, and the responsibility has been transferred to Practice D2991.

1.1These test methods cover the determination of the time dependence of stress (stress relaxation) in materials and structures under conditions of approximately constant constraint, constant test environment, and negligible vibration. In the procedures, the material or structure is initially constrained by externally applied forces, and the change in the external force necessary to maintain this constraint is determined as a function of time.

1.2Specific methods for conducting stress-relaxation tests on materials subjected to tension, compression, bending and torsion stresses are described in Parts A, B, C, and D, respectively. These test methods also include recommendations for the necessary testing equipment and for the analysis of the test data.

1.3Bending stress-relaxation tests to determine relaxation properties by using ring-shaped specimens machined from bulk material have been thoroughly developed and widely used to determine stress-relaxation properties (1).2 These tests are outside the scope of these test methods.

1.4The long time periods required for these types of tests are often unsuited for routine testing or for specification in the purchase of material. However, these tests are valuable tools in obtaining practical design information on the stress relaxation of materials subjected to constant constraint, constant test environment, and negligible vibration, and in investigations of the fundamental behavior of materials.

1.5Units—The values stated in inch-pound units are to be regarded as standard. The values given in parentheses are mathematical conversions to SI units that are provided for information only and are not considered standard.

1.6This 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.

1.7This 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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ASTM F 2789 : 2010 : R2020 Standard Guide for Mechanical and Functional Characterization of Nucleus Devices
ASTM A 421/A421M : 2015 Standard Specification for Stress-Relieved Steel Wire for Prestressed Concrete
ASTM D 6048 : 2007 : R2018 Standard Practice for Stress Relaxation Testing of Raw Rubber, Unvulcanized Rubber Compounds, and Thermoplastic Elastomers

ASTM E 8/E8M : 2024 Standard Test Methods for Tension Testing of Metallic Materials
ASTM E 8/E8M : 2016 : REV A : EDT 1 Standard Test Methods for Tension Testing of Metallic Materials
ASTM E 8/E8M : 2021 Standard Test Methods for Tension Testing of Metallic Materials
ASTM E 6 : 2002 Standard Terminology Relating to Methods of Mechanical Testing
ASTM D 2991 : 1984 Recommended Practice for Testing Stress-Relaxation of Plastics (Withdrawn 1990)
ASTM E 8/E8M : 2022 Standard Test Methods for Tension Testing of Metallic Materials
ASTM E 6 : 2015 : EDT 3 Standard Terminology Relating to Methods of Mechanical Testing
ASTM E 6 : 2023 : REV A Standard Terminology Relating to Methods of Mechanical Testing
ASTM E 4 : 2021 Standard Practices for Force Calibration and Verification of Testing Machines
ASTM E 9 : 1989 : REV A : R1995 Standard Test Methods of Compression Testing of Metallic Materials at Room Temperature
ASTM E 6 : 2015 : EDT 4 : REDLINE Standard Terminology Relating to Methods of Mechanical Testing
ASTM E 6 : 2015 : EDT 4 Standard Terminology Relating to Methods of Mechanical Testing
ASTM E 6 : 2023 Standard Terminology Relating to Methods of Mechanical Testing
ASTM E 4 : 2024 Standard Practices for Force Calibration and Verification of Testing Machines

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