MECHANICS OF COMPOSITE PLATE DISINTEGRATION WITH EXFOLIATIONS AT BENDING

V.V. Partsevsky, A.E. Efimov
VANT. Ser.: Mat. Mod. Fiz. Proc 1997. Вып.1. С. 60.

      A range of problems relating to residual static and dynamic strength of stratified orthotropic plates with exfoliation type defects is studied. Such defects are characteristic of composite elements due to relatively weak layer interfaces. Exfoliations occur during manufacture, operation, especially at shock loads, storage.
      The Reissner type theory was used as a basis to construct approximate solutions in series for the plate regions including exfoliations. Solution convergence in energy was studied. Comparison with
      The results for transversally isotropic plates which allow solutions accurate within the theory is given.
      The energetic approach was used to study the conditions and character of exfoliation fracture growth in arbitrary orthotropic plates. The dependence of fracture growth direction on the anisotropy degree, exfoliation value and location was, in particular, found. The conditions of exfoliated part clicking-out at static and pulsed plate loading with pressure were also studied.