Abstract
The resistance to crack propagation starting from crack initiation to complete fracture is discussed. A method which determines crack growth resistance utilizing the locus of any set of characteristic points on the load vs load-point displacement curves of specimens which differ only in initial crack length is presented. This generalized locus method can also be used to investigate the invariance of the crack resistance along any set of characteristic points. Experimental evaluation of the crack resistance from crack initiation to steady state propagation is performed using a polymeric material. The resistance to crack initiation is determined in terms of the critical J- integral value ( J c ). The resistance to crack propagation at maximum load point is also investigated utilizing the locus of the maximum load points on the load-displacement curves. The plateau resistance ( R p ) during extensive crack propagation is determined utilizing the total essential energy for a complete fracture which is the sum of the blunting energy and the integration of the resistance to crack propagation with respect to the cracking area. The experimental result supports the assumption that the crack initiation resistance ( J c ) and the plateau resistance ( R p ) values are invariant regardless of the initial crack length provided the irreversible deformation zone size around the crack tip is not confined by specimen geometry.
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