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Effect of Cell Morphology on Macroscopic Mechanical Behavior of Open-Cell Foams

Jalilvand, Soroosh | 2012

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  1. Type of Document: M.Sc. Thesis
  2. Language: Farsi
  3. Document No: 42848 (09)
  4. University: Sharif University of Technology
  5. Department: Civil Engineering
  6. Advisor(s): Vafai, Abolhassan; Shahbeyk, Sharif
  7. Abstract:
  8. Solid foams are novel materials with outstanding characteristics that have found numerous applications in the construction of light, stiff structures during the past two decades. At the micro-level, solid foams benefit from a cellular structure, which is composed of either closed or open cells. Open-cell foams, which were the concern of this study, are described as a network of inter-connected struts (or ligaments) with beam-like action. The mechanical design of foams requires their mechanical properties to meet certain criteria. These criteria can be satisfied by careful selection of the base material and the microstructural morphology (geometry). However, the selected material has to be manufactured, and manufacturing is by no means a perfect process. As a result, there is always a threat that the properties of the final material differ from the ones expected. The current study addressed this issue by exploring the effect of morphological imperfections on the uniaxial properties of regular open-cell foams. To this end, we first applied perturbation to the geometry of a specific type of regular open-cell foam to achieve various imperfect morphologies. The next step was to relate the derived morphologies to specific macroscopic uniaxial properties like the plateau stress or Young’s modulus; Homogenization was used for this purpose. The results provided insight on the variation of uniaxial stress-strain response with the imposed imperfections. In particular, this investigation revealed the nature of changes in uniaxial properties (like the plateau stress or the strain interval over which plateau occurs) as linear or pseudo linear with increasing perturbation of the microstructure.

  9. Keywords:
  10. Constitutive Model ; Homogenization ; Open-Cell Foam ; Morphological Imperfection

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