Numerical Simulation For Concrete Material Based On Gradient Damage Model

The basic theory of damage mechanics is summarized and the several kind of concrete damages model is introduced in this paper. Based on the two problems associated with numerical simulation for concrete material zero consumption of energy and mesh dependence in the classical local damage model, the implicit gradient damage model is introduced. The local strain is substituted for the non-local strain and the micro structure criterion is considered in the model. The results of example indicate the implicit gradient damage model can overcome mesh dependence and material zero consumption of energy when the strain-softening phenomenon of concrete material is simulated more actually.When the discretisation of the equilibrium equations with concrete damage variable is discussed, the finite element numerical simulation implementation is introduced. The implicit gradient damage model has been used to simulate the direct tension of double-edge notched specimens on lightweight concrete and the damage field is described with the loading. The results of numerical simulation indicate the implicit gradient damage model can overcome mesh dependence and material zero consumption of energy. In the final, three curved beams is simulated, comparing to crack initiation that has been addressed using crack mechanics, the results indicate that numerical simulation for concrete material based on implicit gradient damage model is feasible.