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Residual stress, aging and fatigue fracture in injection‐molded glassy polymers. II. Polycarbonate
Author(s) -
Iacopi A. V.,
White J. R.
Publication year - 1987
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.1987.070330224
Subject(s) - materials science , polycarbonate , composite material , annealing (glass) , residual stress , notching , metallurgy
Fatigue test have been conducted on notched polycarbonate bars molded using different conditions and having different post‐molding conditioning. Fatigue crack propagation rates were not significantly modified by mechanical preconditioning prior to notching, but annealing in air caused an increase in crack growth rate. Annealing in vacuum did not cause the same effect, but specimens annealed in air or in vacuum showed a fracture surface morphology different from that obtained with unannealed bars. Changes in birefringence during cyclic loading and measurements of skin and core densities as a function of aging time were recorded, but a comprehensive interpretation of the fatigue behavior has not yet been achieved.