FraMCoS 5 2004 Vail, Colorado, USA

Composite Damage Mechanics and Applications to Modeling of Degradation of Concrete

A new theory of composite damage mechanics at the mesoscale level is developed. The mechanical behavior of a distressed composite is described by the combination of two different phases (matrix and inclusion), both of them are linear elastic isotropic materials.…

First page of: Composite Damage Mechanics and Applications to Modeling of Degradation of Concrete
Year 2004
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Abstract

A new theory of composite damage mechanics at the mesoscale level is developed. The mechanical behavior of a distressed composite is described by the combination of two different phases (matrix and inclusion), both of them are linear elastic isotropic materials. The matrix represents the original material without damage, and the inclusions represent the material with ultimate damage. The inclusion volume fraction is used as the variable to characterize the extent of the damage, instead of the conventional scalar damage parameter. The major difference from the scalar damage theory is that the elastic modulus of the inclusion is not zero, which allows various combinations of the two constituent phases, representing different forms of damage evolutions. Specifically, two models based on parallel and serial configurations are introduced. For example, one can simultaneously combine the parallel model representing stiffness of the composite and the serial model representing stress on the composite. Linear and exponential softening stress-strain curves are used to construct the damage models. The stress of distressed composite can be expressed as a function of the level of damage, and as a result, the upper and lower bounds for the stress can be obtained for a given level of damage. Keyword: damage mechanics, composite mechanics, composite damage mechanics, concrete.