![]() ![]() ASTM D52792013 Edition, September 1, 2013Complete DocumentStandard Test Method for Plastics: Dynamic Mechanical Properties: In Torsion
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![]() Description / Abstract:
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.
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. This test method is valid for a wide range of frequencies, typically from 0.01 to 100 Hz. 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. Test data obtained by this test method are relevant and appropriate for use in engineering design. The values stated in SI units are to be regarded as standard. 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. *A Summary of Changes section appears at the end of this standard ![]() |