Finite Element Based Improved

Characterization of Viscoelastic Materials

Xianfeng Song, Stefan Dircks, Daniil Mirosnikov and Benny Lassen

Overview

Introduction

Dynamic Mechanical Analysis

Image Processing

Theory

COMSOL Implementation

Results

Conclusion

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Introduction

Viscoelastic Material

Material Characterization

Hyper-elastic Models

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Dynamic Mechanical Analysis

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Measurement of Force and Displacement

Fig 1. Dynamic Mechanical Analysis ResultDynamic Mechanical Analysis

Image Processing

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Stretch

Undeformed

DeformedFig 2. Image Processing Setup

Image Processing

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Stretch

Undeformed

DeformedFig 3. Distance between two

dots

Theory

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Fig 4. General coordinate system with

deformed and undeformed bodies.

COMSOL Implementation

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Time Dependent Weak Form PDE

Global ODEs and DAEs

Domain Point Probes

Boundary Conditions

Fig 6. The time-dependent lower

boundary condition. Fig 5. Geometry model including two probes.

COMSOL Implementation

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Results

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Comparison between DMA Test and Numerical Model

Results

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Comparison of Different Hyperelastic Models

Conclusion

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From the results of the COMSOL

simulations, all of the hyperelastic models

exhibit the correct trend of the non-linear

behavior of the material. However, the

Arruda-Boyce hyper-elastic material model

proves to be the most accurate of the

chosen.

Thank you!

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