Stress Relaxation/Creep Compliance by Time Sweeps
Test ID
M-611
Description
The test specimen in the form of a rectangular bar is subjected to time sweeps in torsion at multiple temperatures. A family of curves is generated in which the material behaves stiffer at lower temperatures and softer at high temperatures. This shear stress relaxation data is then transformed into a relaxation mastercurve through temperature time superposition (TTS). Since the testing is performed directly in the time domain, no transformation needs to be performed.
Options
The test is typically performed using a rectangular torsional bar. Disk shaped specimens have been successfully used for soft materials such as foam and rubber. Where relevant, the test can also be performed in tension or compression modes.
Standards
- ASTM D5279
Data
Creep Compliance v. Time Mastercurve, Reference Temperature, Relexation v. Time Mastercurve, aT v. Temperature. This data appears in Matereality as Dynamic Mechanical Properties in Torsion.
Replicates
Number of times this test is repeated: 1
Samples
2 torsional DMA specimen [details]
Application
Relaxation and creep compliance curves generated form this test are useful for determining a material's behavior over a long period of loading. Many times this test can generate data that can predict material behavior out to time periods that are not feasible to test any other way. This data can also be used in simulation software to predict long term behavior. If you wish to have data provided for simulation software, please select the appropriate software vendor and viscoelastic model in the TestPak section.
