Parametric Identification For Reactive Powder Concrete Damage Plasticity Constitutive Model And FEM Verification

The failure of RPC material and structure is characterized by crack formation, expansion, and frictional sliding along the crack surface. Damage Plasticity Mechanics is an effective method for this kind of problem. Scalar degradation of the elastic stiffness and plasticity coupling-model well defines the degradation of strength and stiffness -softening behavior.In this paper, the model and material parameters of the RPC concrete plasticity damage constitutive model are identified on the basis of the existing RPC material tests. Using concrete danmage plasticity constitutive model of ABAQUS, the numerical simulation of RPC under uniaxial tensile, uniaxial compression and biaxil compression are presented to make comparisons with the laboratory tests. The results confirm the effectivity of the identified model and material parameters. Main contents are as follows:1. According to RPC material test data and hypothesis within a certain range, the model and material parameters of the reactive powder concrete plasticity damage constitutive model are identified.2. The concept that there is a function with first-order decay exponential relationgship between damage variables and normalized inelastic strain is used in the material parameter identification procedure.3. According to the results of the reactive powder concrete damage tests , the damage viriables and the ratio of stress and peak stress follow a corresponding relationship is introduced to generalize the material parameter results for different kinds of mix proportion reactive powder concrete with large discreteness of peak stress.4. Using FEM software ABAQUS, the numerical simulation of RPC under uniaxial tensile, uniaxial compression and biaxil compression are carried out. Then the FEM analytical results are compared with the laboratory test data. It can be verified that the identified model and material parameters are resonable.