Transcription of Viscoelasticity and dynamic mechanical testing
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Viscoelasticity and dynamic mechanical testing
1 AN004AN004 Viscoelasticity and dynamic mechanical testing A. Franck, TA Instruments GermanyKeywords: dynamic mechanical testing , Viscoelasticity , Hookean body, Newtonian fluid, relaxation time, ,VISCOELASTICITYMost materials are not purely viscous and oftenshow significant elastic behavior. Such materials arereferred to as viscoelastic materials and the keyparameter, the time determines whether viscous orelastic behavior in a slow deformation or flow processthe viscous behavior dominates, whereas in a shorttime process the material behaves predominatelyelastic. Whether a process is fast or slow dependson a characteristic internal material material will be perceived as a viscous liquidif the material time is very short in comparison tothe time of the deformation process.
DYNAMIC MECHANICAL TESTING In an oscillatory measurement the material is subjected to a sinusoidal stress or strain and the strain or stress response is measured (figure 4). The dynamic mechanical analysis (DMA) analyzes both elastic and viscous material response simul-taneously. In this type of experiment, a motor is used
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