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An assessment of crazing criteria for polyetherimide in three‐dimensional stress space
Author(s) -
Woods J. T.,
Delorenzi H. G.
Publication year - 1993
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.760332109
Subject(s) - crazing , materials science , stress space , hydrostatic stress , stress (linguistics) , brittleness , polyetherimide , composite material , consistency (knowledge bases) , hydrostatic pressure , finite element method , structural engineering , mechanics , constitutive equation , geometry , mathematics , polymer , linguistics , philosophy , physics , engineering
Three point bend tests of notched, polyetherimide (PEI) beams are performed for varying notch radii and beam thicknesses. Finite element stress results including pressure sensitive yielding effects are correlated with experimental load‐to‐craze observations to determine the three‐dimensional stress state at craze initiation. Three crazing criteria; maximum principal stress, hydrostatic stress, and the critical strain criterion of Oxborough and Bowden are examined for consistency. Over the range of geometries studied, the critical strain criterion provides the best fit to the experimental data. This criterion could be used as a brittle failure criterion to help understand and prevent brittle failures.