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Dynamic mechanical analysis (TA INSTRUMENTS - Q800 DMA)

Dynamic Mechanical Analysis (DMA) is a technique used to measure the mechanical properties of viscoelastic samples. Many materials (e.g. polymers) have a viscoelastic behavior (both like an elastic solid and a viscous fluid).

From the phase difference (δ) between the applied sinusoidal strain (or stress) and the resultant sinusoidal strain (or stress), the device calculates the following parameters:

- storage modulus (E’), the elastic component related to the sample’s stiffness.
- loss modulus (E’’), the viscous component related to the sample’s ability to dissipate mechanical energy through molecular motion.
- tangent of phase difference (tan δ), a parameter that provides information on the relationship between the elastic and inelastic components.

Other tests could be carried out: creep, stress relaxation, multifrequency, multi stress, controlled Force/Strain Rate, isostrain.

Due to the nitrogen gas use, the Q800 DMA is able to analyze mechanical properties of a sample from -150°C to 600°C.

The available deformation modes are: dual/single cantilever, 3-Point bend, tension film/fiber, shear sandwich and compression.

Laboratoire MAPIEM (EA 4323) - http://mapiem.univ-tln.fr/Dynamic-mechanical-analysis-TA-INSTRUMENTS-Q800-DMA.html - mapiem@univ-tln.fr