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Stress Analysis in Symmetric Composite Laminates Subjected to Shearing Load

Mousanezhad Viyand, Davood | 2011

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  1. Type of Document: M.Sc. Thesis
  2. Language: Farsi
  3. Document No: 41868 (08)
  4. University: Sharif University of Technology
  5. Department: Mechanical Engineering
  6. Advisor(s): Nosier, Asghar
  7. Abstract:
  8. In the present study, an analytical solution is developed to calculate the interlaminar stresses in long symmetric laminated composite plates subjected to shearing load. At first, upon the successive integrations of the strain-displacement relations and using the existing patterns in deformation of a long symmetric laminate, the general displacement field is extracted and simplified to the final form. Presented solution is based on a combined method containing the equivalent single-layer (ESL) theories beside the Reddy’s layerwise theory. In this method, the equivalent single-layer theories are utilized because of their simplicity and low computational efforts rather than the layerwise theory in evaluation of the global parts of the deformation. For this reason, we use Improved First-order Shear Deformation Theory (IFSDT) and Simplified IFSDT (SIFSDT) to calculate the existing constants in the elasticity field of deformation which actually describe the global deformation of the plate. Since it is also possible to calculate these constants by means of the layerwise theory, we can advantageously check the efficiency of the used theory with it as a benchmark. Based on the numerical comparisons, it is clear that the ESL theories have not enough accuracy to assess the constants appeared in the elasticity field of this specific problem. After that, by using Mathematica software, the numerical values of normal and shear interlaminar stresses are found through the laminate by use of the layerwise theory. Several numerical examples are provided to study the interlaminar stresses in the interfaces of the layers and through the thickness of the laminate. The effects of fibers orientation angles as well as the stacking sequences of the layers within laminates on the interlaminar stresses are presented and discussed
  9. Keywords:
  10. Shear Load ; Edge Effect ; Layerwise Theory ; Interlaminar Stress ; Symmetric Composite Laminate ; Improved First-Order Shear Deformation Theory (IFSDT)

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