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.
The linear viscoelastic region of a material is determined in an oscillatory measurement at a constant frequency with increasing stress or strain amplitude. The measured Moduli remain constant as long as the critical strain has not been reached. The end of the linear region is given by a decrease in viscosity or elastic modulus and an increase of
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