Comparison of the quasi-static method and the dynamic method for simulating fracture processes in concrete |
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Authors: | J X Liu S C Deng N G Liang |
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Affiliation: | (1) State Key Laboratory of Nonlinear Mechanics, Institute of Mechanics, Chinese Academy of Sciences, 100080 Beijing, China |
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Abstract: | Concrete is heterogeneous and usually described as a three-phase material, where matrix, aggregate and interface are distinguished.
To take this heterogeneity into consideration, the Generalized Beam (GB) lattice model is adopted. The GB lattice model is
much more computationally efficient than the beam lattice model. Numerical procedures of both quasi-static method and dynamic
method are developed to simulate fracture processes in uniaxial tensile tests conducted on a concrete panel. Cases of different
loading rates are compared with the quasi-static case. It is found that the inertia effect due to load increasing becomes
less important and can be ignored with the loading rate decreasing, but the inertia effect due to unstable crack propagation
remains considerable no matter how low the loading rate is. Therefore, an unrealistic result will be obtained if a fracture
process including unstable cracking is simulated by the quasi-static procedure. |
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Keywords: | Concrete Generalized beam lattice model Inertia effects Quasi-static and dynamic method Fracture |
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