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Damage Map for a Light-Weight Sandwich Beam under Low Velocity Impact Loading

Saadati, Saeed | 2015

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  1. Type of Document: M.Sc. Thesis
  2. Language: Farsi
  3. Document No: 47269 (45)
  4. University: Sharif University of Technology
  5. Department: Aerospace Engineering
  6. Advisor(s): Kouchakzadeh, Mohammad Ali
  7. Abstract:
  8. The main purpose of this study is the analysis of low velocity impact on the light weight sandwich beams. Some parameters such as weight, failure mode, and impact energy absorption capability are very essential in the design of sandwich beams. The failure mode map is a technique to design sandwich structures, in which no single component is over-designed with respect to other components. In this study, the failure mode map of foam core sandwich beams composed of E-glass/Epoxy and PVC foam is drawn and investigated by an analytical method. For this purpose, displacement relations for bending of a sandwich beam are written using higher order theory. In addition, the sandwich beam is modeled and analyzed by finite element method (FEM). To validate the models, the results of maximum impact force and impact energy in a three point bending test derived from the analytical method and FEM are compared with the experimental results available in the literature. The FEM results showed good agreement with the results of other methods. Then, the results are acquired for several face thicknesses and core densitiesin three points bending. Strain failure criteria is used and the time required for core and faceto fail are obtained. The core density resulting in simultaneous fracture of core and face for each face thickness may be indicated. With variation of thickness and core density, failure mode map and absorbed energy are extracted. The results are compared to the results of other articles available in the literature. Finally Effect of unequal faces and distance between supports (beam span) onfailure mode map of the beam are studied. The obtained results may be used to choose a safe design with maximum amount of absorbed energy before failure. The present studyprovides a better understanding on the behavior of sandwich panel under low velocity impact loading
  9. Keywords:
  10. Fracture Energy ; Three Point Bending Test ; High Order Shear Theory ; Failure Modes ; Lightweight Sandwich Beam ; Low Velocity Impact

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