delamination otherwise splitting; delayering; blistering (rus. расслаивание otherwise отщепление слоев в слоистых структурах) — 1) formation of cracks in layered composites at the boundary between the layers under the influence of external loads, and 2) splitting of the individual layers in single-phase layered materials.

Description

Multilayer composites with polymer matrix (the most common type of modern composites) are characterised by their fragile interlayer boundaries, which fail under the action of shear stresses of bending or from impact on the outer surface under the influence of the reflected expansion wave. A special case of delamination is the failure of the boundaries between layers with different orientation of the fibres at the free edge. Such damage to the structure of reinforced plastics significantly reduces the compressive strength of structural elements; therefore, measures aimed at improving boundary strength are an important element in engineering reinforced plastics. In particular, a promising method of preventing delamination is reinforcement of the interlayer galleries with a forest of carbon nanotubes. 

Intercalation of various chemical substances in the interlayer galleries of layered compounds (e.g., layered double hydroxides) followed by chemical or thermal treatment of the intercalate causing its expansion and the splitting of fragments of the layered matrix is a common method for synthesizing lamellar nanoparticles (nano-flakes, nanolayers).

Author

  • Shlyakhtin Oleg A.

Sources

  1. Delamination in composites. — www.engr.sjsu.edu/wrchung/images/MatE135/SP09/delamination.pdf (reference date: 31.07.2010).
  2. Elder D. J., Thomson R. S., Nguyen M.Q., Scott M. L. Review of delamination predictive methods for low speed impact of composite laminates // Composite Structures. 2004. V. 66, №1–4. P. 677–683.

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