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Development of a Layer-wise Model For Prediction of Interlaminar Crack Growth in Laminated Composites Plates Under Cyclic Loading

Kashani, Hossein | 2016

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  1. Type of Document: M.Sc. Thesis
  2. Language: Farsi
  3. Document No: 48343 (45)
  4. University: Sharif University of Technology
  5. Department: Aerospace Engineering
  6. Advisor(s): Hosseini Kordkheili, Ali
  7. Abstract:
  8. In the present work, the beginning and progressive growth of delamination in laminated composites plates has been studied. Interlaminar stresses at free edge of laminate may give rise to edge delamination and result in failure of laminate. So we need to determine the exact interlaminar stresses to predict the failure of laminated composites. A computer code based on layerwise theory that can obtain the exact interlaminar stresses been developed. Comparison between the present study and finite element software result showed the good agreement.A fracture mechanics approach is used to analysis delamination propagation between layers of composites laminate. In this approach damage propagation controlled with strain energy release rate and failure criterion based on critical strain energy release rate has been presented. A layerwise finite element is developed to calculate the strain energy release rate in crack front based on J- integral technique. This integral is path independent and can be calculated in path away from the crack front. In the analysis of fracture mechanics of structures using three-dimensional (3D) J-integral, an integral evaluation of line and surface is required. The presented computational procedure is validated throught several numerical example and compared with some experimental and Analytical results
  9. Keywords:
  10. Strain Energy Release Rate ; J-Integral ; Delamination ; Free Edge Effect ; Layerwise Theory ; Cyclic Loading ; Crack Growth ; Laminated Composite Sheets

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