The J-Integral as a Fracture Parameter

J-dominance

• crack tip conditions are equal for all geometries and they are all controlled by the magnitude of J.
• large deformation zone (zone of intense deformation) can be expected to extend one CTOD distance beyond the crack tip
• this zone is surrounded by a larger zone where J dominance applies.

• in order for J to be a valid fracture parameter, all pertinent length parameters (crack size, ligament size, and thickness) all exceed several times d_t