Evaluation of critical loading parameters for composites with imperfect contact of layers

Problems of establishing upper and lower boundaries for critical loading parameters of internal instability for composites with imperfections between layers were considered. Stability loss in laminated massif with sliding layers was investigated for the case of space non-axisymmetrical problems of the three-dimensional linearized theory of deformed body stability. Layers were simulated by transversal-isotropic: a) compressible elastic; b) incompressible elastic; c) incompressible elastic-plastic (with power mode interdependence between stress and strain intensities) bodies. The upper and lower boundary dependences of critical loading parameters on filter and binder concentrations were presented for some constructional composites.