Characterization of strain bursts in high density polyethylene by means of a novel nano creep test

Recent nanoindentation experiments have shown that in semi-crystalline polymers, strain bursts emerge during creep experiments

H. Wilhelm

2019

Scholarcy highlights

  • First observation of negative strain bursts and oscillations after a strain burst
  • Recent nanoindentation experiments have shown that in semi-crystalline polymers, strain bursts emerge during creep experiments
  • Since the strain bursts in polymers are in the nm range, an extremely high resolution in deformation measurement is necessary
  • Such a resolution is provided by modern solid state rheometers having a resolution < 10−6 rad
  • In this work single strain bursts in PE-HD have been investigated in creep mode at stresses as low as < 0.5 MPa
  • In summary the new method represents a powerful tool for a quantitative characterization of strain bursts and gives a new insight to dislocation kinetics in semi-crystalline polymers

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