A Destruction Model for an Anisogrid Composite Structure

Abstract

Finite element modeling of the deformation and fracture processes in a composite anisogrid (network) structure made of carbon fiber reinforced plastic (CFRP) with different types of deformation has been performed. The anisogrid structure is based on a longitudinal set of ribs supported by diagonal sets of ribs directed at angles of about ±45° with respect to the longitudinal ribs. Based on the model of mechanical property degradation for composite material layers strength analysis of the structure has been performed taking into account the process of damage accumulation in the course of loading. The maximum destructive load is determined and the fracture pattern is obtained for each type of deformation. The determining impact of the rib-crossing zones of different directions as the foci of progressive destruction of the entire anisogrid structure is established.