Active Standard ASTM D945 | Developed by Subcommittee: D11.10
Book of Standards Volume: 09.01
Historical (view previous versions of standard)
Significance and Use
5.1 The rubber properties that are measurable by these test methods are important for the isolation and absorption of shock and vibration. These properties may be used for quality control, development and research.
5.2 Measurements in compression are influenced by specimen shape. This shape factor may be described as the ratio of the loaded surface area to the unloaded surface area. In applying data from a compression specimen, shape factor must be incorporated into the mathematical transferal to the application.
1.1 These test methods cover the use of the Yerzley mechanical oscillograph for measuring mechanical properties of rubber vulcanizates in the generally small range of deformation that characterizes many technical applications. These properties include resilience, dynamic modulus, static modulus, kinetic energy, creep, and set under a given force. Measurements in compression and shear are described.2,3
1.2 The test is applicable primarily, but not exclusively, to materials having static moduli at the test temperature such that forces below 2 MPa (280 psi) in compression or 1 MPa (140 psi) in shear will produce 20 % deformation, and having resilience such that at least three complete cycles are produced when obtaining the damped oscillatory curve. The range may be extended, however, by use of supplementary masses and refined methods of analysis. Materials may be compared either under comparable mean stress or mean strain conditions.
1.4 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. For a specific warning see 12.14.
2. Referenced Documents (purchase separately) The documents listed below are referenced within the subject standard but are not provided as part of the standard.
SAE StandardSAEJ16 Classification of Elastomer Compounds for Automotive Resilient Mountings Available from Society of Automotive Engineers, 400 Commonwealth Drive, Warrendale, PA 15096., The Yerzley oscillograph was originally described in detail in the paper by Yerzley, F. L., A Mechanical Oscillograph for Routine Tests of Rubber and Rubber-Like Materials, Proceedings, ASTM, Vol 39, 1939, p. 1180; also Rubber Chemistry and Technology, Vol XIII, No. 1, January 1940, p. 149.
D832 Practice for Rubber Conditioning For Low Temperature Testing
D1207 Recommended Practice for Classifying Elastomeric Compounds for Resilient Automotive Mountings
D4483 Practice for Evaluating Precision for Test Method Standards in the Rubber and Carbon Black Manufacturing Industries
ICS Number Code 83.060 (Rubber)