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A Hyper-Viscoelastic Constitutive Model for Polyurea under Uniaxial Compressive Loading.

Yang Bai1, Chunmei Liu2, Guangyan Huang3

  • 1State Key Laboratory Explosion Science and Technology, Beijing Institute of Technology, Beijing 100081, China. baiyang828@163.com.

Polymers
|April 14, 2019
PubMed
Summary

This study introduces a hyper-viscoelastic model for polyurea, combining Ogden and K-BKZ models. This approach accurately captures both hyperelastic and viscoelastic behaviors across various strain rates for polyurea materials.

Keywords:
K-BKZOgdencompressionhyperelasticpolyureaviscoelastic

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Area of Science:

  • Materials Science
  • Continuum Mechanics
  • Polymer Physics

Background:

  • Polyurea exhibits complex hyper-viscoelastic behavior, crucial for dynamic applications.
  • Accurate constitutive models are needed to predict polyurea's response under varying strain rates.
  • Existing models may not fully capture the transition from rubbery to glassy states.

Purpose of the Study:

  • To develop and validate a hyper-viscoelastic constitutive model for polyurea.
  • To differentiate and select appropriate models for hyperelastic and viscoelastic components.
  • To identify the optimal combination of models for comprehensive polyurea behavior prediction.

Main Methods:

  • Separated hyperelastic and viscoelastic behaviors for modeling.
  • Utilized Ogden and Mooney-Rivlin models for hyperelasticity, fitting quasi-static data.
  • Employed Standard Linear Solids (SLS) and K-BKZ models for viscoelasticity, fitting split Hopkinson pressure bar (SHPB) data.

Main Results:

  • The Ogden model demonstrated superior accuracy for hyperelasticity at strains > 0.3.
  • The K-BKZ model was selected for viscoelasticity due to its better performance at high strain rates (> 2100 s⁻¹) and lower RMSE below 1600 s⁻¹.
  • The combined Ogden-K-BKZ model effectively represents polyurea's hyper-viscoelastic characteristics.

Conclusions:

  • A novel hyper-viscoelastic constitutive model for polyurea was successfully established.
  • The model integrates the Ogden model for hyperelasticity and the K-BKZ model for viscoelasticity.
  • This validated model provides a robust framework for simulating polyurea's mechanical response in diverse conditions.