Some authors have done the tensile test and dynamic mechanical analysis test to predict the mechanical property of polymer nanocomposite. I would like to consider only the dynamic mechanical analysis test to find the mechanical property of polymer nanocomposite. Can I do it and is there any publish paper on it?
Are you only worried about PUBLISHING? Then now a days, anything in indigestible form will be accepted :). For doing good work, it is definitely not the equipment but the results which you can make a worthy meaning out of it is needed for the scientific community. So, if only using DMA due to lack of facilities/resources, you can get meaningful results and compare with some rigorous literature, then the results are acceptable.
Of course you can do it if you have resources available to carry out dynamic mechanical properties evaluation. Split-Hopkinson Pressure Bar (SHPB) is one of the techniques used to study the dynamic deformation behavior of a wide range of materials including polymeric materials. It is also known as Kolsky bar. SHPB facilitates testing materials at very high strain rates in tension and compression as well.
Please refer to Chapter 4 of the book by W. Chen and B. Song on SHPB to get an insight into high strain rate deformation of soft materials.
Are you only worried about PUBLISHING? Then now a days, anything in indigestible form will be accepted :). For doing good work, it is definitely not the equipment but the results which you can make a worthy meaning out of it is needed for the scientific community. So, if only using DMA due to lack of facilities/resources, you can get meaningful results and compare with some rigorous literature, then the results are acceptable.
As a general rule start by asking yourself : 'What do I want to measure?' Then, and only then, ask yourself: 'How can I measure that property?'
DMA will provide some engineering constants and information on their sensitivity to viscous effects. However, you won't be getting strength information or Poisson's ratio from DMA testing. If you are only interested in the moduli, DMA is satisfying. Otherwise, tensile, shear compressive, whatever testing is required.
Best regards,
DMA is good rather than other to satisfy your question.
think, that more important what to measure is question what for? In case of mechanical properties, you have to be sure if there is standard (ASTM, ISO, whatever) to make same measurement of (for example) pure polymer. Using other words: if for publishing, make DSC, DMA, AFM force modulation, put some SEM images. But If You trying to improve the UTILITY properties better consider the oldest tests such as: tensile strength, Young's modulus, Shore's hardness test, abrasion by Schopper-Schlobach, and so on. There is much more data according to standard's properties than for eg. DMA. But I got the question for all: is there any standard for measure loss and/or storage modulus????
The people who have answered have a very good point: what are you trying to measure? If you look at publications in the field, you find that people used DMA, FTIR, lot of SEM/TEM pictures, and then ASTM/ISO mechanical tests. If you are trying to find mechanical properties, you may need to use an axial machine with a small load cell (1-10 kN range). A shear rheometer will allow you to characterize loss and storage shear moduli at different frequency sweeps, where the strain is supposed to be in the material's linear viscoelastic range (according to Halley and McKay, Polym Eng Sci, 1996, 36, 593). There is really a lot of information out there. Nano composites are a very active area, and there are a lot of papers to skim through.
One thing I would like to point out is that some journals and some authors do not put a lot of emphasis on statistics, you will not know if the authors just had a lucky day with perfect data, or the data is actually statistically robust. I personally want to use averages, standard deviations, box plots, but I have seen plenty of publications in which they do not appear at all.
Best luck!
To M Rebis,
ISO 6721 - Plastics — Determination of dynamic mechanical properties:⎯ Part 1: General principles
⎯ Part 2: Torsion-pendulum method
⎯ Part 3: Flexural vibration — Resonance-curve method
⎯ Part 4: Tensile vibration — Non-resonance method
⎯ Part 5: Flexural vibration — Non-resonance method
⎯ Part 6: Shear vibration — Non-resonance method
⎯ Part 7: Torsional vibration — Non-resonance method
⎯ Part 8: Longitudinal and shear vibration — Wave-propagation method
⎯ Part 9: Tensile vibration — Sonic-pulse propagation method
⎯ Part 10: Complex shear viscosity using a parallel-plate oscillatory rheometer
⎯ Part 11: Glass transition temperature
⎯ Part 12: Compressive vibration — Non-resonance method
Laurent Cormier, thanks. When I started playing with DMA, only TA Instruments manual was the 'standard'.
I assume you are talking about thermoplastic nanocomposites. Doing only DMTA is not really satisfactory, at least not if any engineering/structural/loadbearing applications are relevant. As always it the balance of properties that should be considered. For structural applications you should really get a yield stress , a static modulus and fracture toughness (Naturally all of these to be compared with the control). None of these will obtained from DMTA.
Simple mechanical tests will be good to include along with DMA.
-Tensile, Flexural, Impact, Hardness (these are simple tests available in many institutes)
-With DMA, you can get a lot of results, I have attached three papers here for reference.
Johan J. Sánchez- THANKS!!! If I will work with DMA again it seems I will have to spend few US$ for mentioned papers.
- Badges
- Science topic
- Similar topics
- Engineering
- Materials Engineering