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The plastic deformation processes that occur in a tensily deformed HighDensity Polyethylene specimen were studied from full-field strain and strainrate measurements obtained by 3D DIC (Digital Image Correlation).The tensiletests were performed every 10{\textdegree}C from room temperature to120{\textdegree}C . For temperatures below 60{\textdegree}C , it is shown thatthe strain localization effect becomes less pronounced when the temperatureincreases. For temperatures higher than 60{\textdegree}C , the material isfound to exhibit double yielding behavior. By analyzing the DIC data inLagrangian representation, it was possible to quantitatively highlight thestrain localization effect that is specifically associated with the secondyield. The second yield strain (E_{Y_2}) was measured and appeared to beindependent of temperature. For temperatures smaller than 60{\textdegree}C , itwas found that the threshold strain corresponding to (E_{Y_2}) also marks theonset of the deformation process phase during which the volume strain stronglyincreases. Based on previous studies of our research team and on literature weconcluded that the critical strain (E_{Y_2}) corresponds to the onset of thelamellar morphology destruction. At high strain levels, the neck stabilizationphase was shown to proceed according to a strain driven scheme characterized bythreshold strains that are temperature independent. The experimental values ofthe threshold strain marking the onset of the stabilization phase are found tobe in good agreement with those found using the Haward-Thackray model.

Use of Digital Image Correlation to study the effect of temperature on the development of plastic instabilities in a semi-crystalline polymer