ASTM-E328 2008

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E328-02(2008) Standard Test Methods for Stress Relaxation Tests for Materials and Structures

Published By	Publication Date	Number of Pages
ASTM	2008	13

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Category: ASTM

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Description

Note 1The method of testing for the stress relaxation of plastics has been withdrawn from this standard, and the responsibility has been transferred to Practice D 2991 .

1.1 These test methods cover the determination of the time dependence of stress (stress relaxation) in materials and structures under conditions of approximately constant constraint, constant environment, and negligible vibration. In the procedures recommended, 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.

1.2 Specific 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.

1.3 It is recognized that the 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 the conditions enumerated, and in investigations of the fundamental behavior of materials.

1.4 Units 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.

1.5 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 and health practices and determine the applicability of regulatory limitations prior to use.

13.1 This test method covers the determination of the time-dependent decrease in stress in a specimen subjected to an uniaxial constant tension strain under conditions of uniform environment and negligible vibration. It also includes recommendations for the necessary testing equipment.

22.1 This test method covers the determination of the time-dependent decrease in stress in a specimen subjected to a long duration, uniaxial, constant compression strain in a uniform environment and negligible vibration. It also includes recommendations for the necessary testing equipment.

30.1 This test method covers the determination of the time-dependent decrease in stress in a specimen subject to long duration, constant bending strain, in a uniform environment, and negligible vibration. Recommendations for some typical test equipment are included. Methods included are only those in which the outer fiber strain is essentially uniform in the test section.

39.1 This test method covers the determination of the time-dependent decrease in torsional stress in a specimen subjected to long duration, constant torsional strain in a uniform environment and negligible vibration. Recommendations for some typical test equipment are included. The test method applies when the outer fiber strain is essentially uniform in the test section.

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PDF Pages	PDF Title
1	Scope
2	Referenced Documents Terminology FIG. 1
3	Summary of Test Methods Significance and Use FIG. 2 FIG. 3
4	Apparatus Temperature Control and Measurement Vibration Control Test Specimens Environment Guide for Processing Test Data Report FIG. 4
5	Scope Summary of Test Method Apparatus Test Specimens Grips Procedure Guide for Processing Test Data Report Precision and Bias FIG. 5
6	Scope Summary of Test Method Apparatus Test Specimens Procedure FIG. 6
7	Guide for Processing Test Data Report Precision and Bias Scope Summary of Test Method Apparatus FIG. 7
8	Test Specimens FIG. 8
9	Procedures Calculation and Presentation of Results FIG. 9
10	Interpretation of Results Report
11	Precision and Bias Scope Summary of Test Method Apparatus Test Specimens
12	Procedure Calculation and Presentations of Results
13	Report Precision and Bias Keywords REFERENCES

Additional information

Standard Title	E328-02(2008) Standard Test Methods for Stress Relaxation Tests for Materials and Structures
Published Code	ASTM
Publication Date	2008
Pages Count	13

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