Oscillatory Neck Propagation in Polymer Films
Imagine stretching a long strip of PET, often the plastic deformation is violent, and the sample just breaks. However, sometimes the film can be stretched for more than 2 times in length, and the stress actually oscillates. The obvious manifestation is a pattern consists of opaque and translucent stripes, shown as the gif on the right. This region is what we called “neck”, which has smaller width and thickness than...
