Damage growth in composite laminates with interleaves
The influence of placing interleaves between fiber-reinforced plies in multilayered composite laminates is investigated. The geometry of the composite is idealized as two-dimensional, isotropic, linearly elastic media made of a damaged layer bonded between two half-planes and separated by thin interleaves of low extensional and shear moduli. The damage in the layer is taken in the form of a symmetric crack perpendicular to the interface and may extend up to the interface. The case of an H-shaped crack in the form of a broken layer with delamination along the interface is also analyzed. The interleaves are modeled as distributed shear and tension springs. Fourier integral transform techniques are used to develop solutions in terms of singular integral equations. An asymptotic analysis of the integral equations based on Muskhelishvili's techniques reveals logarithmically singular axial stresses in the half-plane at the crack-tips for the broken layer. For the H-shaped crack, similar singularities are found to exist in the axial stresses at the interface crack-tips in the layer and the half-plane. Numerical results indicate that interleaves increase the interfacial damage tolerance and significantly relieve the stresses in the undamaged plies.
- Research Organization:
- Clemson Univ., SC (USA)
- OSTI ID:
- 6482157
- Country of Publication:
- United States
- Language:
- English
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