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Effect of temperature gradients on cure and stress gradients in thick thermoset castings
Author(s) -
Pusatcioglu S. Y.,
Hassler J. C.,
Fricke A. L.,
McGee H. A.
Publication year - 1980
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.1980.070250305
Subject(s) - thermosetting polymer , materials science , temperature gradient , casting , residual stress , composite material , work (physics) , kinetics , stress (linguistics) , thermodynamics , linguistics , philosophy , physics , quantum mechanics
The temperature gradient developed during casting of an unsaturated polyester for which the kinetics of reaction and the heat capacities, thermal conductivities, and densities were known from earlier work was measured experimentally as a function of time in a thick casting and compared with predicted values calculated from a mathematical model. Agreement was excellent. The castings were sectioned and the sections were examined by birefringence. These examinations show good agreement between the temperature gradient developed during cure and the residual stress gradient. This work demonstrates that the extent of cure as a function of position can be predicted from heat transfer calculations if the reaction kinetics and thermal properties are known and that the residual stress gradient is dependent upon the temperature gradient developed.