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A Coupled Experiment-finite Element Modeling Methodology for Assessing High Strain Rate Mechanical Response of Soft Biomaterials
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Quantifying dynamic mechanical properties of human placenta tissue using optimization techniques with

Jingwen Hu1, Kathleen D Klinich, Carl S Miller

  • 1University of Michigan Transportation Research Institute, 2901 Baxter Road, Ann Arbor, MI 48109, USA. jwhu@umich.edu

Journal of Biomechanics
|August 12, 2009
PubMed
Summary

Accurately measuring placental tissue properties is crucial for developing better car safety for pregnant individuals. This new method improves accuracy by considering detailed tissue geometry and dynamic loading conditions.

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Area of Science:

  • Biomechanics
  • Materials Science
  • Obstetrics

Background:

  • Motor-vehicle crashes are a leading cause of fetal death due to maternal trauma.
  • Placental abruption is the most common cause of fetal death in these incidents.
  • Accurate material properties of pregnant tissues are needed for improved vehicle safety systems.

Purpose of the Study:

  • To characterize the dynamic material properties of placental tissue.
  • To apply a novel method for determining soft tissue properties under dynamic loading.
  • To reduce errors in material property characterization compared to traditional methods.

Main Methods:

  • Uniaxial tensile tests on 21 placenta specimens at a strain rate of 12/s.
  • Specimen-specific finite-element models incorporating laser-scanned geometry.
  • Optimization techniques to determine material model parameters.

Main Results:

  • Mean failure strain of placental tissue: 0.472+/-0.097.
  • Mean failure stress of placental tissue: 34.80+/-12.62 kPa.
  • A first-order Ogden material model best fit the data (mu=23.97+/-5.52 kPa, alpha(1)=3.66+/-1.90).

Conclusions:

  • The developed method significantly reduces error (nearly 40%) in material property determination.
  • This approach accounts for detailed geometry and dynamic loading effects.
  • The method is applicable for characterizing mechanical properties of other soft biological tissues.