I have this semi-crystalline polymer and I am confused by its stress-strain behavior. I considered DIN527 for my measurement (couldn’t use norm specimen for a few reasons) and measured young’s modulus for quasi static deformation ~0,02 mm/s. Later I changed to ~0,5 mm/s. I know the modulus will be dependent on strain rate, but the results seem to be too extreme. Any idea what happened there?
Dear Andreas Hoffmann . See the following useful RG link: Article The Effect of Strain Rate on the Mechanical Properties of Hu...
Kindly see also the following useful RG link: Article Temperature and strain rate dependences on hardening and sof...
Also check please the following useful RG link: Article High Strain Rate Mechanics of Polymers: A Review
The following RG link is also very useful: Article Strain rate effect on semi-crystalline PLLA mechanical prope...
Visit kindly the following useful link: https://gala.gre.ac.uk/id/eprint/25456/7/25456_OKEREKE_Two-process_Constitutive_Model_For_Semicrystalline_Polymers_%28AAM%29_2019.pdf
Aref Wazwaz thank you very much for your suggestions. So, you imply that this behavior is a real strain-rate dependency. I still have doubts, because the difference in slope seems to be very high compared to similar materials I tested, so I will redo the experiments, just to make sure. Have a nice day.
As far as can be seen from your screenshot, initial slop of the strain-stress curves (used for modulus calculations) is quite similar. Differences, as expected, are observed for Yield Stress and Ultimate Elongation, whereas the highest yield stress and lowest ultimate elongation (yellow curve), probably are associated with the highest strain rate.
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