
Accession Number : ADP001721
Title : Constitutive Relations of Concrete Subjected to a Varying Strain Rate,
Corporate Author : NORTHWESTERN UNIV EVANSTON IL
Personal Author(s) : Shah,S. P.
Report Date : MAY 1983
Pagination or Media Count : 4
Abstract : Experiments conducted on concrete subjected to impact loading in uniaxial tension, uniaxial compression and in flexure, indicate that (1) the strain effects in concrete are not isotropic, (2) the stressstrain curves becomes less nonlinear with increasing strain rate and (3) the rate of growth of internal microcracking decreases with increasing strain rate. A continuous damage model is proposed to establish the constitutive relationship of concrete. To include the effect of strain rate on internal damage, an inertial term is introduced in the damage evolution equation. The damage is expressed as a tensor quantity. The Hermholtz free energy function is expressed in terms of both the invariants of strain tensors and damage tensors. Equations predicted by the model are compared with the experimental results. (Author)
Descriptors : *Concrete, *Strain rate, Symposia, Impact, Loads(Forces), Tensile properties, Compressive properties, Flexural properties, Stress strain relations, Microcracking, Mathematical models, Damage assessment, Tensors, Equations, Mathematical analysis
Distribution Statement : APPROVED FOR PUBLIC RELEASE