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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.
Anàlisi Termomecànica (TMA) allows us to measure the variations in the dimensions of a sample, depending on the temperature, when it is subjected to a non-oscillating load.
The measurement can correspond either to an expansion if the load does not cause a deformation of the sample, or to a measurement of the deformation due to the applied load, or to a variation of the dimensions caused by the temperature and the load.
In order to request sample analysis by TMA, you must contact the staff responsible for the equipment.
The toxicity and storage precautions of the samples must be reported.If unclaimed, surplus samples will be destroyed within one week of delivery of results.
In the TMA technique, the sample is placed on a quartz support (low coefficient of thermal expansion), at the same time the sample is in contact with a quartz probe.Depending on the mechanical test mode (compression, bending or traction) a suitable support and probe are used.The set is inserted into a programmable temperature oven.
When the temperature program is run, the sample undergoes a change in its dimensions, either an expansion or a contraction.This change will cause a displacement of the probe (both are in contact) which will be measured by an LVDT sensor.
In the graph resulting from the TMA test, the variation of the dimensions of the sample is obtained depending on the temperature.
TMA instruments allow a controlled force to be applied to the sample through the probe.When no force is applied or its value is very low (only to ensure good contact with the sample), the test is used to obtain the coefficient of thermal expansion (coefficient of expansion) of the material.By applying force on the sample, studies can be carried out using creep-recovery.
This technique is particularly suitable for measuring variations in the dimensions of solids or powders.
TMA is used to characterise polymers and composites (bleaching, glass transition, degradation, cross-linking) subjected to different stresses.
It is also used to study films and fibres, sintering of ceramics, thermal behaviour of alloys and, more generally, to measure the coefficient of expansion.
Pdf file of the technique
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