Abstract
It has been established that at medium stresses and temperatures crack development in PMMA takes place in three stages: in the first stage the crack grows with progressive deceleration; in the second stage, which determines the life of the specimen, there is almost no development; and only in the final stage does the rate of growth of the crack rapidly increase. Damage accumulation in the interior of the polymer remote from the main crack is shown to play an important part. Experimental stress and temperature dependences have been obtained for the starting velocity and the incubation period of crack development together with a universal relation between these characteristics. The processes determining the crack growth kinetics in the various phases of long-term static tension are given a physical basis.
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