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Mechanical characterization of PVA hydrogels’ rate-dependent response using multi-axial loading

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  • Wanis Nafo
  • Adil Al-Mayah

Abstract

The time-dependent properties of rubber-like synthesized and biological materials are crucial for their applications. Currently, this behavior is mainly measured using axial tensile test, compression test, or indentation. Limited studies performed on using multi-axial loading measurements of time-dependent material behavior exist in the literature. Therefore, the aim of this study is to investigate the viscoelastic response of rubber-like materials under multi-axial loading using cavity expansion and relaxation tests. The tests were performed on PVA hydrogel specimens. Three hyperelasitc models and one term Prony series were used to characterize the viscoelastic response of the hydrogels. Finite element (FE) simulations were performed to verify the validity of the calibrated material coefficients by reproducing the experimental results. The excellent agreement between the experimental, analytical and numerical data proves the capability of the cavity expansion technique to measure the time-dependent behavior of viscoelastic materials.

Suggested Citation

  • Wanis Nafo & Adil Al-Mayah, 2020. "Mechanical characterization of PVA hydrogels’ rate-dependent response using multi-axial loading," PLOS ONE, Public Library of Science, vol. 15(5), pages 1-16, May.
    • Handle: RePEc:plo:pone00:0233021
    DOI: 10.1371/journal.pone.0233021
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    1. Jingxin Zhao & Fei Zhai & Jun Cheng & Qiong He & Jianwen Luo & Xueping Yang & Jinhua Shao & Huichun Xing, 2017. "Evaluating the Significance of Viscoelasticity in Diagnosing Early-Stage Liver Fibrosis with Transient Elastography," PLOS ONE, Public Library of Science, vol. 12(1), pages 1-16, January.
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