Interpreting DMA curves, Part 1
The first part of this work introduces the technique of dynamic mechanical analysis (DMA) and deals with nonisothermal DMA measurements. The second part will cover various aspects of isothermal measurements, concentrating primarily on frequency-dependent elasticity.
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A number of different measurement modes are used: - Shear for samples with a shear modulus in a very large range from about 1 kPa to 2 GPa. This allows viscous liquids and even solid samples, e.g. polymers in the glassy state, to be measured. - Three-point bending for stiff samples with a modulus of elasticity of up to 1000 GPa. - Single and dual cantilever bending for samples that deform too strongly with three-point bending. - Tension for thin bars, films and fibers. - Compression for samples with a modulus of elasticity of up to about 1 GPa
Viscoelastic Material Characterisation Database