A computational study of the fracture behaviour of concrete in a modified Split Hopkinson Bar test
conference paper
For a numerical prediction of the response of concrete structures under extreme dynamic loading, reliable material data and material models are crucial. A modified Split Hopkinson Bar, SHB, test methodology is used to determine the material properties in tension at high loading rates which are used in numerical models simulating progressive fracturing. The main focus of this paper is to examine the predictive capability of existing classical and regularised continuum models in reproducing the SHB experiments. These models are based on continuum damage theories in which the net effect of fracture is idealised as a degradation of elasticity of the material. Strain-rate dependency of materials subjected to an impulsive loading is taken into account by including viscous terms in the continuum description. The examples here give an indication of the sensitivity of the model parameters in the computational models and the coupled viscoplastic damage model shows the promising capability of simulating the fracture process of the SHB test. The effect and physical interpretation of the parameters and their mutual dependency in dynamics are not sufficiently understood, and more work is needed to present a physically realistic model for concrete under high loading rates based on micro-mechanics to account for the true mechanisms that cause the strength increase.
TNO Identifier
466492
ISBN
9781617820632
Source title
11th International Conference on Fracture 2005, ICF11, 20-25 March 2005, Turin, Italy (Vol. 2)
Pages
1241-1246
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