Abstract:
Dynamic mechanical analysis (DMA) is a powerful technique for characterization of the
viscoelastic properties of polymers such as thermoplastics, composites, thermosets and elastomers
in the form of sheet specimens, films, fibers, coatings or adhesives. DMA instruments measure the
modulus (stiffness) and damping (energy dissipation) properties of materials as they are deformed
under dynamic stress. When a polymeric material is subjected to a cyclic sinusoidal stress within
the viscoelastic region, the corresponding strain in the material would be out of phase due to the
delayed response of the viscous portion of the material. This phase difference corresponds to the
frequency of the force application and this is a unique characteristic of the polymer material.
Amplitude of the strain curve and phase shift between stress and strain curves are usually
identified as basic parameters.
In this design which is based on the ISO 6725 standard, forced vibration method was used and the
vibrations are impacted by the inertia force of an eccentric rotating mass is used to generate
sinusoidal force. Multi stress and multi frequency modes are operated by adjusting eccentricity
and speed of rotating mass. The instrument also has facility to adjust the static force imparted on
the specimen. Deformation of the material is detected by a displacement sensor. This design
satisfied all requirements of the testing standard.
Citation:
Herath, H.M.R.C., Rodrigo, I.J., & Weragoda, V.S.C. (2017). Design of a dynamic mechanical analyser for rubber compounds
[Abstract]. In V. Sivahar (Ed.), Leveraging materials for a smart future (p. 2). Society of Mechanical Engineering Students, Department of Materials Science and Engineering, University of Moratuwa.