what are the prerequisites to prepare sample for DMA analysis? i have Fiber reinforced polymer composites to test for vibrational damping?
You need to know what type of dynamic mechanical analyzer you have. If you have a true, high-end DMA machine, such as Aries series, you should be able to use relatively thick composite (say above 3 mm thick) without worrying about the errors caused by the machine deformation. However, more recent machines that are typically used to analyze polymer films, the make-up of the machine is relatively weak and thus strong composite materials are too stiff to be used if the thickness is too high. In this case, you should use samples with thickness typically around 0.2-0.5 mm. In either the case, the width is also very important. Composite material, if it is a continuous fiber reinforced polymer, is anisotropic and the stress field near the edge of the width is very different from the inside the specimen. This is particularly so within the first 0.5 mm from the end of the width surface. Therefore, if the width of the specimen is too narrow, these regions with improper stress field can significantly influence the results. Thus, the width should be greater than 10 mm to minimize this influence. The typical sample dimensions we used was 51 mm x 13 mm x 3 mm since we had the most rigid H-frame dynamic mechanical spectrometer (Rheometrics RMS-800).
Dear Ravi SHANKAR Rai
The below-mentioned/attached may be useful
https://mountainscholar.org/bitstream/handle/10217/195246/Rodriguez_colostate_0053N_15281.pdf?sequence=1
Article Dynamic mechanical analysis of carbon/epoxy composites for s...
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