FRACTOGRAPHY APPLIED TO POLYMERIC MATERIALS. PART 6: CREEP AND ENVIRONMENTAL CRACKING TESTS ON HIGH TEMPERATURE POLYMERS

Authors
  1. Speelman, J.
  2. Thornley, J.C.
  3. Mitchell, A.B.
Corporate Authors
Defence Research Establishment Atlantic, Dartmouth NS (CAN);New Brunswick Research and Productivity Council, Fredericton NB (CAN)
Abstract
The results of continuing studies of the creep and environmental stress cracking behavior of polymeric materials are reported. A size effect observed in environmental stress cracking of polymethylmethacrylate (PMMA) specimens has been attributed to surface softening of the polymer by the environmental agent. Differences in the creep behavior of PMMA samples in air were related to orientation effects and/or inhomogeneities in the original rolled sheet. Annealing of samples was found to prolong creep ductility of the polymer. Low voltage scanning electron microscopy techniques were tried on polymer fracture surfaces but were found to be inferior to other electron microscopic techniques used in studying fracture surfaces.
Report Number
DREA-CR-90-401 — Contractor Report
Date of publication
15 Dec 1989
Number of Pages
76
DSTKIM No
91-00096
CANDIS No
67318
Format(s):
Hardcopy;Originator's fiche received by DSIS

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