Abstract
High speed cinematography (up to 6000 frames sec−1), as well as optical and electron microscopy, was used to study the formation and propagation of thin and thick shear bands in atactic polystyrene, with and without obstacles in their paths of propagation. Three different kinds of obstacles were studied, an existing thick band, a fully recovered thick band and a region dispersed with 2 to 6 μm rubber particles (a strip of high impact polystyrene). Except for the fully recovered thick band which behaved like undeformed polystyrene, the other two obstacles effectively reduced the speed of propagation of the shear band packets and changed their mode of operation by dispersing them into thin bands and spreading them out into larger spaces. However, the original localized mode of operation resumed after the shear band packet passed through the obstacles.
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