Concrete Cracking

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Concrete Cracking

Research
I'm using Concrete Damage Plasticity model and I'm struggling in modeling the tension effects in concrete.  It asks for yield stress vs plastic strain.  I know once the stress reaches the modulus of rupture, the concrete cracks, how do I model that in abaqus under the tension effects?  Right now I can't run a 420" long beam deflecting 1" on the opposite end as the cantilever, it stops and gives me the "time increment required is too small..." error.