Analysis of carrying capacity of layered fibrous composites

The method of ultimate equilibrium is used to analyse the carrying capacity of fibrous composites. It is supposed that unidirectional fibrous composite (monolayer) at plane stress-strain state possesses features of ideally plastic orthotropic body. Condition of maximal stresses is considered as a condition of plasticity beginning. Design relations for estimation of extreme characteristics of layered materials are obtained by means of the method of inequalities.