摘要
This paper takes concrete as a four-phase composite made of the intact matrix and three mutually perpendicular groups of penny-shaped micro-cracks.The intact matrix is assumed to be elastic,homogeneous and isotropic,and the micro-cracks are penny-shaped.Combined with the failure mechanism of concrete subjected to impact loading,a dynamic constitutive model for concrete is developed based on Mori-Tanaka's average stress concept and Eshelby's equivalent inclusion theory.Experimental results show that concrete is rate-dependent.The model predictions are in good agreement with the experimental results.The model may be used to simulate the mechanical behavior of concrete under impact loadings.
基金
supported by the National Natural Science Foundation of China(Grant No.10625208)
the Science Foundation of Ningxia University(Grant No.ndzr09-5)
