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Coexistence of ductile, semiductile, and brittle fractures of elastomer‐modified polycarbonates
Author(s) -
Liu WenBing,
Chang FengChih
Publication year - 1995
Publication title -
journal of applied polymer science
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.575
H-Index - 166
eISSN - 1097-4628
pISSN - 0021-8995
DOI - 10.1002/app.1995.070560503
Subject(s) - brittleness , materials science , tearing , composite material , elastomer , fracture (geology) , stress (linguistics) , plane stress , brittle fracture , structural engineering , philosophy , linguistics , finite element method , engineering
Phenomenologically, coexistence of ductile, semiductile, and brittle fractures in an apparently identical impact testing condition for the elastomer‐modified polycarbonates containing a sharper notch and at high test temperatures has been found. At the ductile–brittle transition temperature, approximately 10% of specimens fractured in the semiductile mode with impact strength about the average of the ductile and brittle modes. The fracture surface of this semiductile mode shows ductile tearing flow in the plane‐stress regions near the edges and brittle crack in the plane‐strain central region. This unusual semiductile fracture occurs only on the thicker specimens with a sharper notch where clear plane‐stress and plane‐strain are present. © 1995 John Wiley & Sons, Inc.