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Modelling Nonlinear Viscoelastic Behavior of Hydrogels

Beheshti Seresht, Hassan | 2021

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  1. Type of Document: M.Sc. Thesis
  2. Language: Farsi
  3. Document No: 54572 (45)
  4. University: Sharif University of Technology
  5. Department: Aerospace Engineering
  6. Advisor(s): Mohammad Navazi, Hossein; Arghavani Hadi, Jamal
  7. Abstract:
  8. In this thesis, the mechanical properties of collagen hydrogels were characterized using Finite Element method and the collagen content effect on the mechanical properties of hydrogels were investigated. Hydrogels samples with different collagen content were assessed which caused diverse mechanical behaviors. Due to the nonlinear behavior of hydrogels, using numerical methods and simulation softwars can be helpful to determine the mechanical properties of these material and save agreat deal of time. Finite Viscoelaticity theory was exploited for a UMAT Subroutine in Abaqus and an special Starin Energy Function was selected to extract the formulations. The agreement between simulation results and experimental data is one of the bases to determine mechanical properties. Thereafter, Taguchi method was used to decreas calculations needed to determine the optimal inputes for UMAT file. These inputs containe mechanical properties and material parameters for each sample with different collagen content. The provided results of this thesis state that collagen content increases the shear moduli of hydrogels linearly. This conclusion can be useful to predict the amount of shear moduli for hydrogels with diverse collagen contents and provide favorable conditions for more efficient use of these materials
  9. Keywords:
  10. Hydrogel ; Taguchi Method ; Gels ; Elastomers ; Design of Experiments Method(DOE) ; Relaxation Process ; Finite Viscoelasticity

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