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A Constitutive Model to Predict the Strain Rate Dependent Behavior of Auxetic Materials

Heidari, Mohammad Hossein | 2019

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  1. Type of Document: M.Sc. Thesis
  2. Language: Farsi
  3. Document No: 52166 (08)
  4. University: Sharif University of Technology
  5. Department: Mechanical Engineering
  6. Advisor(s): Arghavani, Jamal; Naghdabadi, Reza
  7. Abstract:
  8. A new types of architected cellular materials are those with negative poisoon’s ratio named auxetic. This materials indicate unormal behavior under different loads as if they were stretched in one direction, they also expanded in other directions and if pressure is exerted in one direction, they are compressed in all directions. Auxetic materials can improve mechanical properties such as shear strength, strength to weight ratio, thoghness, energy and vibration dissipation and crack expansion due to fatigue.The useful features of this material have been taken into account in a variety of industries, including the automotive industry, in the manufacture of parts such as body and bumper, resistant and anti-impact tires, impactors and dashboards, seat belts and shock absorbers.The purpose of this study is to provide a strain-strain structure model for dynamically yielding of the auxetic material with honeycomb cell structure by means of finite element simulation that can determine the stress-strain properties of different geometries of the desired auxetic materials at different strain rates with appropriate accuracy and by that, it will reduce a lot of time and effort to make practical tests and experiments to find the properties of the material you want. In the further dependency and how to change of the mechanical properties of these materials relative to the design parameters of the cell structure, such as the angle of the cell, the aspect ratios, and the cell coefficient of the cell has been studied in the static and dynamic tests, to help designer use this materials that have different properties due to changes in their geometry, in his designs by extracting this materials design charts
  9. Keywords:
  10. Architected Materials ; Auxetic Materials ; Negative Poisson's Ratio ; Modeling ; Constitutive Modeling

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