Abstract
To improve the fracture, fatigue and wear resistance of rubber one needs to understand the microscopic as well as macroscopic aspects of rubber fracture. For rubber, the crack tip acts as a stress concentrator, in addition the stress concentration affects the molecular arrangement. This stress induced molecular arrangement in turn changes the mechanical properties near the crack tip region which may be anisotropic in nature. In carbon filled natural rubber (NR), the carbon black reinforcement induces strain crystallization near the crack tip and has anisotropic mechanical properties [ 1]. Another study [2] showed that carbon black expands the crack tip crystallization zone and increases the crystallinity. Reference [3] showed that strain induced crystallinity increases the fracture resistance of carbon black reinforced natural rubber. It appears that the rubber microstructure of virgin material influences the direction of crack propagation.
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