Dynamic mechanical analysis by nanoindentation
With the development of new materials, new indentation methods have been developed for their characterization. One of the most widely used is dynamic mechanical analysis (DMA) by nanoindentation to measure viscoelastic properties. At Anton Paar, this method is called Sinus indentation and can be used with Hit 300, NHT3, UNHT3 or UNHT3 Bio. The present application report summarizes the principle of this method, recommended parameters and typical applications.
Dynamic mechanical analysis (DMA) is based on application of oscillatory component to some type of quasistatic loading profile. It has been developed mainly for viscoelastic materials such as polymers, where this type of test can reveal viscoelastic properties of the material in form of storage (E’) and loss modulus (E’’) . When testing viscoelastic materials with the DMA or similar oscillatory methods, there is a lag (phase shift) δ in strain compared to force oscillations. The storage and loss moduli represent the elastic portion or stored energy (storage modulus) and viscous part or dissipated energy (loss modulus) of the material.
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