Deformation and Short-Term Damage of a Physically Nonlinear Unidirectional Fibrous Composite

Abstract

A structural theory of the coupled processes of deformation and short-term damage of unidirectional fibrous composites with physically nonlinear components whose stress–strain curves have a descending section is developed. The damage process is modeled as the collapse of dispersed microvolumes followed by the formation of quasispherical micropores. A strain-based failure criterion formulated for the second invariant of the deviatoric macrostrain tensor is used as a condition for the short-term damage of a microvolume of the material. The effect of the fiber volume fraction on the deformation and damage of a unidirectional fibrous composite is analyzed