Smeared rotating crack model - Concrete3

Implementation of smeared rotating crack model. Virgin material is modeled as isotropic linear elastic material (described by Young modulus and Poisson ratio). The onset of cracking begins, when principal stress reaches tensile strength. Further behavior is then determined by softening law, governed by principle of preserving of fracture energy $G_f$. For large elements, the tension strength can be artificially reduced to preserve fracture energy. Multiple cracks are allowed. The elastic unloading and reloading is assumed. In compression regime, this model correspond to isotropic linear elastic material. The model description and parameters are summarized in Tab. 19.

Table 19: Rotating crack model for concrete - summary.

Description	Rotating crack model for concrete
Record Format	Concrete3 d(rn) # E(rn) # n(rn) # Gf(rn) # Ft(rn) # exp_soft(in) # tAlpha(rn) #
Parameters	- num material model number
	- d material density
	- E Young modulus
	- n Poisson ratio
	- Gf fracture energy
	- Ft tension strength
	- exp_soft determines the type of softening (0 = exponential, 1 = linear)
	- tAlpha thermal dilatation coefficient
Supported modes	3dMat, PlaneStress, PlaneStrain, 1dMat, 2dPlateLayer, 2dBeamLayer, 3dShellLayer