Effect of shear stresses on failure of fibrous composite materials accounting for nonlinear material behavior

Abstract EN

Variation of shear stresses  xy on failure behavior of different composite materials was investigated for two types of composites; Boron-Epoxy Narmco 5505 and Carbon-Epoxy AS4 (3501-6).

The effect of material nonlinearity on failure behavior of unidirectional fibrous composite laminates was considered for several fiber-orientation angles ; ϴ = 15, 30, 45, 60 and 75 degrees.

An energy-based nonlinear material model was adopted to predict the mechanical properties of a unidirectional composite lamina.

A compatible failure criterion for nonlinear composite materials was utilized which incorporates the material model into the failure criterion.

The resulting failure envelopes were compared for all the cases.