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Development of an improved parameter fitting method for planar biaxial testing using rakes.

Heleen Fehervary1, Jos Vander Sloten1, Nele Famaey1

  • 1Biomechanics Section, KU Leuven, Celestijnenlaan 300C, Heverlee 3001, Belgium.

International Journal for Numerical Methods in Biomedical Engineering
|November 30, 2018
PubMed
Summary

Accurate material parameter estimation from planar biaxial tests is improved with a new finite element-based correction method. This approach accounts for stress differences observed in virtual experiments, enhancing finite element model accuracy.

Keywords:
FE simulationsboundary conditions corrected parameter fittingconstitutive modelingparameter fittingplanar biaxial testingrakes

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Area of Science:

  • * Biomechanics
  • * Materials Science
  • * Computational Mechanics

Background:

  • * Accurate material parameter estimation is critical for finite element model (FEM) outcomes.
  • * Planar biaxial tests can exhibit stress discrepancies between measured forces and actual sample stress due to boundary conditions.
  • * Traditional parameter fitting methods fail to account for these discrepancies, leading to inaccurate material property estimations.

Purpose of the Study:

  • * To introduce and validate a novel parameter fitting procedure for planar biaxial tests.
  • * To address the stress calculation differences arising from experimental setup boundary conditions.
  • * To improve the accuracy of material parameter estimation in biomechanical and material science applications.

Main Methods:

  • * Development of a finite element-based correction vector to account for stress differences.
  • * Application of the new fitting procedure to real experimental data from planar biaxial tests using rakes.
  • * Utilization of image processing to extract experimental characteristics for finite element model construction.
  • * Investigation of two variations: a basic approach and an image-based approach.

Main Results:

  • * The proposed parameter fitting procedure, in both basic and image-based variations, demonstrated improved estimation of sample behavior.
  • * Performance was assessed by comparing experimental rake forces with simulated rake forces, showing reduced discrepancies.
  • * Both new approaches outperformed the classic parameter fitting method in accurately capturing material behavior.

Conclusions:

  • * The novel parameter fitting procedure effectively corrects for stress differences in planar biaxial tests.
  • * Incorporating a finite element-based correction vector significantly enhances material parameter estimation accuracy.
  • * This methodology provides a more reliable approach for material characterization using planar biaxial testing data.