Polymer Mechanics

, Volume 3, Issue 1, pp 26–30 | Cite as

Two-dimensional extension of polyethylene and polypropylene film

  • N. P. Novikov


The two-dimensional extension of polyethylene and polypropylene film has been investigated by optical microscopy. It has been established that there is no two-dimensional plastic flow (two-dimensional necking) and that failure is quasi-brittle in character. In a small region near the cracks that develop, uniaxial orientation of the polymer associated with stress concentrations near the crack tip is observed. Measurements show that the ultimate stress in two-dimensional extension is close to the necking stress in uniaxial tension.


Polymer Microscopy Polyethylene Optical Microscopy Polypropylene 
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Copyright information

© The Faraday Press, Inc. 1970

Authors and Affiliations

  • N. P. Novikov
    • 1
  1. 1.Institute of Problems of Mechanics, AS USSRMoscow

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