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Fracture of the Nonlinear Multi-Layered Composites

Jaroniek M.

Mechanics and Mechanical Engineering

2009

Vol. 13, nr 2

5-21

Advanced mechanical and structural applications reąuire accurate assessment of the damage state of materials during the fabrications as well as during the service. Due to the complex naturę of the internal Structure of the materiał, composites including the layered composite often fail in a variety of modes. Fabrication of the functionally graded materials (FGM) can be obtained by layered mixing of two materials of different thermo-mechanical properties with different volume ratios gradually changed from layer to layer such that first layer has only a few particles of the other phase and last has maximum volume ratio of this other phase. The materiał (FGM) is functionally graded thermal and stress barrier. Between the ceramic layer and metallic bond layer there exist a functionally graded layer "2" that contains volume ofthe bond (metallic) phase as a function of the distance y from he bond layer and volume ratio of the ceramics phase also as a function of y distance from the bond layer. The failure modes very often are influenced by the local materiał properties that may develop in time under heat and pressure, local defect distribution, process induced residual stress. and other factors. Fracture problems in the layer can be studied using J integral in finite element method, because it is not path independent. Consider a laminate composite in plane stress conditions, multi-layered beam bonded to planes. The fracture mechanics problem will be analysed using the photoelastic visualisation ofthe fracture events in a model structure.