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ASTM D1043-16(2024)

Current Reaffirmation

Standard Test Method for Stiffness Properties of Plastics as a Function of Temperature by Means of a Torsion Test

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1.1 This test method covers the determination of the stiffness characteristics of plastics over a wide temperature range by direct measurement of the apparent modulus of rigidity.

1.2 The values stated in SI units are to be regarded as the standard. The values given in parentheses are for information only.

1.3 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 and ISO 458-1 and ISO 458-2 address the same subject matter, but differ in technical content.

1.4 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.


4.1 The property measured by this test is the apparent modulus of rigidity, G, sometimes called the apparent shear modulus of elasticity. It is important to note that this property is not the same as the modulus of elasticity, E, measured in tension, flexure, or compression. The relationship between these properties is shown in Annex A1.

4.2 The measured modulus of rigidity is termed “apparent” since it is the value obtained by measuring the angular deflection occurring when the specimen is subjected to an applied torque. Since it is possible that the specimen will be deflected beyond its elastic limit, the calculated value will not always represent the true modulus of rigidity within the elastic limit of the material. In addition, the value obtained by this test method will also be affected by the creep characteristics of the material, since the load application time is arbitrarily fixed. For many materials, it is possible that there is a specification that requires the use of this test method, but with some procedural modifications that take precedence when adhering to the specification. Therefore, it is advisable to refer to that material specification before using this test method. Table 1 in Classification D4000 lists the current ASTM material standards.

4.3 This test method is useful for determining the relative changes in stiffness over a wide range of temperatures.

SDO ASTM: ASTM International
Document Number D1043
Publication Date Feb. 1, 2024
Language en - English
Page Count 12
Revision Level 16(2024)
Supercedes
Committee D20.10
Publish Date Document Id Type View
Sept. 1, 2016 D1043-16 Revision
April 1, 2010 D1043-10 Revision
Sept. 1, 2009 D1043-09 Revision
April 10, 2002 D1043-99 Revision
April 10, 2002 D1043-02 Revision
Feb. 1, 2024 D1043-16R24 Reaffirmation