Applied Studies Of Cellular Automata To The Numerical Test Of Concrete During Dynamic Load

Concrete is a kind of cement composite material. Its composition is complex and presents heterogeneity, nonlinear and brittle failure. People have less knowledge on mechanical properties and the failure mechanism of concrete than that of metal, and far less knowledge on the dynamic conditions in dynamic mechanical properties of concrete. At present, there is study on the failure process of concrete in various dynamic load conditions, and its situation is different from that in the static load conditions, and the strength of concrete also presents the obvious strain rate effect simultaneously. However, at present there is not the further research about concrete material conditions of dynamic mechanical properties and failure mechanism during dynamic loading .The heterogeneity of concrete makes the rupture process of concrete very complex, therefore the heterogeneity of concrete is the control factor in rupture process of concrete. Based on the Cellular Automata theory, Multiple Random Equivalent Plane Truss Model provides a new approach to describe the mechanical character of concrete, by means of increasing the connection between elements rather than the amount of elements, this model can describe the material inhomogenous on a microscopic level, which will also leads to the reduce of elemental amount and calculation time.The research has been performed in this article about the parameters in Space Truss Model: the ultimate strength of model rods, the variance of intensity distribution theory, the damp and the elastic modulus of rods etc. Through the comparison of examples and the experimental results it shows that this model can predict the strain rate variable load cases of material damage constitutive phases, which provides a new kind of method and thinking for concrete in dynamic mechanical properties research, and even provides a new kind of numerical simulation method with any scales general applicability for the class of non-homodeneous brittle materials filled with the interior space and the tiny cracks like concrete the non-uniform dynamic mechanical properties.