DYNAMIC MECHANICAL ANALYSIS

The UD series was developed to meet the requirements of dynamic applications even in cyclic applications with a high number of cycles and a short stroke. The actuators are designed to operate either alone on structures or on production lines for quality control. Not just simple electrodynamic actuators, but true electrical machines for any type of application where high performance is required.

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WHAT IS DYNAMIC MECHANICAL ANALYSIS (DMA)?

Dynamic mechanical analysis (DMA) is a widely used technique to characterise 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 the intermediate characteristics for which some phase shifting will occur during DMA tests.

Typical challenges in DMA testing are:

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

DMA TEST SYSTEMS

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UHFTS ultra-high frequency machine

UHF Specs	UHF04	UHF010	UHF020	UHF025
Max. Peak force	4.40 kN	11.10 kN	20.75 kN	24.75 kN
Max. Dynamic force (Sinusoidal fatigue)	2.25 kN	5.55 kN	10.65 kN	15.85 kN
Max. Static force	1.25 kN	3.20 kN	6.20 kN	9.30 kN
Max. Test speed@Peak force	5 m/s	5 m/s	2.7 m/s	2.7 m/s
Max. Test frequency	1000 Hz	1000 Hz	600 Hz	600 Hz
Standard stroke	115 mm	115 mm	160 mm	160 mm
Cooling	Air	Air	Air	Air
Working temperature	5-30 °C	5-30 °C	5-30 °C	5-30 °C
Facility requirement	3PH 400V	3PH 400V	3PH 400V	3PH 400V