期刊
MATERIALS
卷 7, 期 1, 页码 441-456出版社
MDPI AG
DOI: 10.3390/ma7010441
关键词
stress-softening effects; biomaterial residual strains; biological tissues; rule of mixtures; pseudo-elasticity theory
类别
资金
- Tecnologico de Monterrey-Campus Monterrey, through the Research Chair in Nanomaterials for Medical Devices
- Tecnologico de Monterrey-Campus Monterrey, through the Research Chair in Intelligent Machines
- European Commission [FP7-PEOPLE-2009-IRSES-247476]
- Consejo Nacional de Ciencia y Tecnologia (Conacyt), Mexico
In this work, we use the rule of mixtures to develop an equivalent material model in which the total strain energy density is split into the isotropic part related to the matrix component and the anisotropic energy contribution related to the fiber effects. For the isotropic energy part, we select the amended non-Gaussian strain energy density model, while the energy fiber effects are added by considering the equivalent anisotropic volumetric fraction contribution, as well as the isotropized representation form of the eight-chain energy model that accounts for the material anisotropic effects. Furthermore, our proposed material model uses a phenomenological non-monotonous softening function that predicts stress softening effects and has an energy term, derived from the pseudo-elasticity theory, that accounts for residual strain deformations. The model's theoretical predictions are compared with experimental data collected from human vaginal tissues, mice skin, poly(glycolide-co-caprolactone) (PGC25 3-0) and polypropylene suture materials and tracheal and brain human tissues. In all cases examined here, our equivalent material model closely follows stress-softening and residual strain effects exhibited by experimental data.
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