Abstract
On the assumption that craze behavior under static tension can be expressed by a simple rate theory, the deformation curves by crazing were discussed for creep and constant strain-rate tensions in poly (methyl methacrylate) wetted by kerosene as a crazing agent, by applying the Johnston-Gilman theory of dislocations.
An increase in theoretical creep strain εc by crazing was approximated by the following equation used commonly.
εc=ε0exp(ασ)tn
where σ is the applied stress, t is the time, and ε0, α and n are constants, respectively. This may provide a physical foundation for the widely-used equation derived from the rate theory.
The yield points by crazing, tested at two strain rates, agreed well with the theoretical calculations. This agreement between the theory and the experimental results indicates the applicability of the present method to the deformation kinetics by crazing.
