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14 February 2017
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Teaching is concentrated in the faculties and schools, and the departments deal with research, which is also conducted by institutes and chairs, at the same time responsible for knowledge promotion.
L’Anàlisi Dinamomecànica (DMA) he uses itself to measure the mechanical and viscoelastic properties of the materials depending on the temperature, the time and the frequency when these undergo a periodic effort.
In order to request the analysis of samples for DMA, you have to get yourselves with the staff responsible for the team in touch.
It be necessary to inform of the toxicity and precautions of storage of the samples. If they do not come to search, the surpluses of sample will be destroyed in the deadline of a week from the delivery of results.
Certain materials, as for example the polymers, show a combination of elastic and viscous behaviour when they are deformed. These materials are called viscoelastic and can be studied through the DMA.
In the DMA a dynamic force (in the form of sinusoidal oscillation) is applied about a test tube of known dimensions and the deformation provoked about this is measured. In a perfectly elastic material the maximums of force and deformation coincide (the oscillations are in phase), in a viscous material there is however a phase difference of 90º among the oscillations of force and deformation. In the case of a viscoelastic material the angle of phase difference will be understood between 0º and 90º.
In the instrument of DMA the test tube of sample fixes using a specific tooling depending on the type of mechanical essay to carry out (flexion, traction or blade). The whole works in in an oven with precise control of the temperature.
The proportion among elastic behaviour/viscous behaviour of the material depend of two parameters: the temperature in the one that finds the sample and the frequency in the one that applies the oscillating force to itself. It is because of that that the programme of analysis will be able to be carried out in two modalities: establishing a constant frequency and one carrying out swept of temperatures or fixing a temperature and variant the frequency in the one that is applied the force.
The following list enumerates some of the properties that can be studied through the Analysis Dinamomecànic:
The more important areas of application include:
Card in Pdf of the technique
The acquisition of this equipment has been co-financed by the Agency of Management of University Grants and of Research (AGAUR) of the Government of Catalonia across European Background of Regional Development (FEDER).
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