Rubber materials are widely used in dynamic applications, and prone to fatigue crack growth under cyclic loadings. Rubber's non-linear and viscoelastic behavior leads to unsymmetric distribution of tearing energy. This work addresses the material calibration procedure for asymmetric distribution of tearing energy: intrinsic strength, tearing energy correction factor, tearing energy and delta of number of cycles as a functional parameter in parametric form of Paris–Erdogan equation. A set of replicates of SBR and NR carbon black-filled rubber composition have been characterized via Endurica's strain ramp procedure, using Haversine pulse deformation cycles.

• Fracture mechanics in non-linear viscoelastic material
• Asymmetric tearing energy profiles in rubber fracture
• In-depth understanding of Paris–Erdogan equation
• Endurica strain ramp procedure
• Characterization of crack growth rate versus tearing energy