New EA series

DYNAMIC MECHANICAL ANALYSIS 

Dynamic mechanical analysis (DMA) dynamic characterization is a technique that measures stress as a function of strain or force as a function of displacement. It involves applying a sinusoidal strain to the material and measuring the resulting stress. Typically, DMA also involves varying the strain rate and temperature of the specimen, also known as Dynamic Mechanical Thermal Analysis  (DMTA).

The UD series is designed to meet the needs of dynamic applications even in cyclic applications with a high number of cycles and a short-stroke. The actuators are designed to operate either stand-alone on structures or production lines for quality control. Not just simple electromechanical actuators but real electrical machines to perform any kind of application where high performance is required.

New EA series

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Dynamic mechanical analysis (DMA) is a widely used technique to characterize the properties of a material as a function of temperature, time, frequency, stress, atmosphere, or a combination of these parameters.
By applying a small deformation to a sample in a cyclic manner, it is possible to study the material’s response to stress, temperature, frequency, and other values. The sample can be subjected to controlled stress or controlled strain. In DMA, the viscoelastic property of the material is studied by applying a sinusoidal force (stress σ) and measuring the resulting displacement. For a perfectly elastic solid, the resulting strain and stress will be perfectly in phase.

For a purely viscous fluid, there will be a 90-degree phase shift of the deformation to the stress. Viscoelastic
Viscoelastic polymers have intermediate characteristics for which some phase shifts will occur during DMA testing.

Benefits

Typical challenges in DMA testing are:

  • The difficulty of accurately measuring motion and force at high frequencies.
  • The ability to accurately measure the phase lag between applied displacement and resultant force.
  • The frequency variations of excitation, stress, strain, and temperature.
  • Ensure proper PID tuning and control stability and accuracy even though sample behavior may sometimes change by orders of magnitude during testing.
  • Combine and synchronize mechanical and temperature excitations to the specimens ensuring that the specimen temperature is uniform.