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Photoelastic phenomena in plastics during impact
Author(s) -
Hall N. W.,
Wright R. E.,
Smith W. C.
Publication year - 1962
Publication title -
polymer engineering and science
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.503
H-Index - 111
eISSN - 1548-2634
pISSN - 0032-3888
DOI - 10.1002/pen.760020312
Subject(s) - materials science , composite material , izod impact strength test , strain (injury) , toughness , polarized light microscopy , plasticity , optical microscope , forensic engineering , scanning electron microscope , optics , ultimate tensile strength , engineering , medicine , physics
The study of strain patterns in deformed, transparent plastic placed between crossed Polaroids can shed considerable light on the responses of these plastics to stress. This article describes a study of the differing responses of three thermoplastics of varying degrees of toughness to the notched Izod impact test. The growth and waning of the strain patterns during impact are followed by means of high‐speed cinematography; interpretation of the phenomena thus observed is aided by thin section microscopy of partially deformed specimens.