Poisson function and volume ratio of soft anisotropic materials under large deformations

Accurate transverse deformation measurements are required for the estimation of the Poisson function and volume ratio. In this study, pure silicone and soft composite specimens were subjected to uniaxial tension, and the digital image correlation method was used to measure longitudinal and in- and o...

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Bibliographic Details
Published in:Journal of the mechanical behavior of biomedical materials 2024-10, Vol.158, p.106689, Article 106689
Main Authors: Filho, J.C.A.D., Nunes, L.C.S.
Format: Article
Language:English
Subjects:
Anisotropy
Auxetic
Biomechanical Phenomena
Digital image correlation
Humans
Materials Testing
Mechanical Phenomena
Mechanical Tests
Poisson Distribution
Poisson's ratio
Silicones - chemistry
Skin
Soft biological tissues
Soft composite
Stress, Mechanical
Transverse deformations
Volume ratio
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Summary:Accurate transverse deformation measurements are required for the estimation of the Poisson function and volume ratio. In this study, pure silicone and soft composite specimens were subjected to uniaxial tension, and the digital image correlation method was used to measure longitudinal and in- and out-of-plane transverse stretches. To minimize the effects of measurement errors on parameter estimation, the measured transverse stretches were defined in terms of the longitudinal stretch using a new formulation based on Poisson's ratios and two stretch-dependent parameters. From this formulation, Poisson functions and volume ratio for soft materials under large deformations were obtained. The results showed that pure silicone can be considered isotropic and nearly incompressible under large deformations, as expected. In contrast, Poisson's ratio of silicone reinforced with extensible fabric can exceed classical bounds, including negative value (auxetic behavior). The incompressibility assumption can be employed for describing the stress-stretch curve of pure silicone, while volume ratios are required for soft composites. Data of human skin, aortic wall, and annulus fibrosus from the literature were selected and analyzed. Except for the aortic wall, which can be considered nearly incompressible, the studied soft tissues must be regarded as compressible. All tissues presented anisotropic behavior.
ISSN:1751-6161
1878-0180
1878-0180
DOI:10.1016/j.jmbbm.2024.106689