A NON-LOCAL APPROACH WITH EVOLUTIONARY INTERNAL LENGTH FOR THE ANALYSIS OF MODE I FRACTURE PROCESSES IN CONCRETE

Abstract eng:
A non-local approach with an “evolutionary internal length” is here proposed and implemented in the formulation of the “Crush-Crack” non-local damage model. The internal length is actually made evolving with the damage from its initial value, which is correlated to the material characteristic length. The evolution laws of the internal length with damage have been calibrated, mainly with reference to the value that such a length has to assume at complete breakage of the material (damage equal to one), in order to not retrieve the drawbacks of a local analysis. The calibration of such a law and of the whole set of model parameters is performed on both 1D and 2D benchmarks in uniaxial tension, taking a Normal Strength Concrete as a reference. The reliability of the proposed approach is finally checked with reference to experimental results from direct tension tests.

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