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Crack‐tip plastic zones in glassy polymers under small‐scale yielding
Author(s) -
Gdoutos E. E.
Publication year - 1981
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.1981.070260616
Subject(s) - von mises yield criterion , materials science , composite material , ultimate tensile strength , polymer , yield (engineering) , plasticity , hydrostatic pressure , hydrostatic stress , compressive strength , poisson's ratio , fibre reinforced plastic , poisson distribution , structural engineering , mechanics , mathematics , finite element method , statistics , physics , engineering
Two pressure‐modified von Mises yield criteria were used for the determination of the plastic zones developed around cracks subjected to opening‐mode loading conditions in glassy polymers. These criteria take into account the particular behavior of glassy polymers expressed by the dependence of their yield locus on the hydrostatic stress component and the difference in their tensile and compressive yield stresses. It was found that both criteria predict larger plastic zones than those obtained by the von Mises criterion which increase as the ratio of the compressive to tensile yield stress also increases. Furthermore, it was established that the differences in the predictions of plastic zones between the two criteria and the von Mises criterion increase with the Poisson's ratio of the material of the cracked plate.