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Correlations between the Aging Behavior and Finite Element Method Simulation of Three Silicone Elastomers.

Svenja Marl1, Xiaofei Ni2, Tobias Hornig1

  • 1Institute for Materials Technology, University of Kassel, 34125 Kassel, Germany.

Materials (Basel, Switzerland)
|August 29, 2024
PubMed
Summary

Material properties of silicone elastomers change over time due to aging. This study correlates mechanical property changes with Mooney-Rivlin model parameters, validating their use in finite element method (FEM) simulations for aged components.

Keywords:
FEMMooney–Rivlin modelagingsilicone rubber

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Area of Science:

  • Materials Science
  • Polymer Physics
  • Computational Mechanics

Background:

  • Material properties of silicone elastomers degrade over time due to chemical and physical aging.
  • The finite element method (FEM) is crucial for designing components, but requires accurate material parameters that account for aging.
  • Existing literature lacks data on the evolution of Mooney-Rivlin parameters for silicone elastomers during aging.

Purpose of the Study:

  • To establish a correlation between the changes in mechanical properties of silicone elastomers over an extended storage period and the parameters of the Mooney-Rivlin model.
  • To investigate the aging behavior of silicone elastomers and its impact on material parameters used in computational modeling.
  • To validate the Mooney-Rivlin model parameters derived from uniaxial tests for predicting multiaxial behavior in aged silicone elastomers.

Main Methods:

  • Investigated Shore A hardness, rebound elasticity, compression set, and tensile properties of two liquid silicone rubbers (LSRs) and one room-temperature-vulcanizing (RTV) silicone rubber over approximately 200 days.
  • Performed uniaxial tensile tests and multiaxial tension tests to probe material behavior.
  • Utilized finite element simulations to verify standard tensile test results and Mooney-Rivlin model parameters, validating them against multiaxial behavior.

Main Results:

  • Observed varying trends in characteristic values across different silicone elastomers during aging.
  • Generally noted increases in Shore A hardness, rebound resilience, and stress at 100% strain, alongside a decrease in compression set.
  • Confirmed that Mooney-Rivlin model parameters derived from uniaxial tests accurately predicted the material's multiaxial behavior and reflected the influence of aging in FEM simulations.

Conclusions:

  • The study successfully correlated aging-induced changes in silicone elastomer mechanical properties with Mooney-Rivlin model parameters.
  • The derived Mooney-Rivlin parameters are validated for use in FEM simulations, accurately representing aged material behavior.
  • This research provides a foundation for designing components with silicone elastomers that account for long-term material property changes and aging effects.