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The effects of cyclic stress on dental polymethylmethacrylate
Author(s) -
HARGREAVES A. S.
Publication year - 1983
Publication title -
journal of oral rehabilitation
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.991
H-Index - 93
eISSN - 1365-2842
pISSN - 0305-182X
DOI - 10.1111/j.1365-2842.1983.tb00108.x
Subject(s) - crazing , materials science , cyclic stress , composite material , stress (linguistics) , acrylic resin , flexural strength , modulus , fatigue testing , work (physics) , polymer , mechanical engineering , engineering , coating , philosophy , linguistics
Summary Mechanisms of fatigue failure in polymers and the aims of fatigue testing have been examined, and factors affecting testing summarized. In the light of available work in several fields, parameters have been suggested for realistic flexural fatigue testing of denture base resins. A testing machine has been developed, with which the changes in properties of acrylic resin after fatigue in different environments can be studied. These changes developed gradually after 104 cycles and were related to the development of bulk crazing rather than to thermal effects. The amount of decay in the elastic modulus was not such that the material could have been said to have ‘failed’.