The Effect of Strain Rate on the Stress Relaxation of the Pig Dermis: A Hyper-Viscoelastic Approach
| Autor: | Piyush Lakhani, Navin Kumar, Krashn Kr Dwivedi, Sachin Kumar |
|---|---|
| Rok vydání: | 2020 |
| Předmět: |
Materials science
Swine 0206 medical engineering Biomedical Engineering 02 engineering and technology Viscoelasticity Stress (mechanics) Dermis Physiology (medical) medicine Stress relaxation Animals Composite material Strain (chemistry) Viscosity Biomechanics Strain rate 021001 nanoscience & nanotechnology 020601 biomedical engineering Elasticity Biomechanical Phenomena medicine.anatomical_structure Linear Models Relaxation (physics) Stress Mechanical 0210 nano-technology |
| Zdroj: | Journal of Biomechanical Engineering. 142 |
| ISSN: | 1528-8951 0148-0731 |
| DOI: | 10.1115/1.4046205 |
| Popis: | The understanding of strain rate-dependent mechanical properties of the skin is important for accurate prediction of its biomechanics under different loading conditions. This study investigated the effect of strain rate, i.e., 0.025/s (low), 0.5/s (medium), and 1.25/s (high), ranging in the physiological loading rate of connective tissue, on the stress-relaxation response of the porcine dermis. Results show that in the initial phase of the relaxation, the value of stress relaxation (extent of relaxation) was found higher for high strain rate. However, the equilibrium stress was found strain rate independent. A Mooney–Rivlin-based five-term quasi-linear viscoelastic (QLV) model was proposed to determine the effect of strain rate on the stress-relaxation behavior of the porcine dermis. The value of relaxation modulus G1 and G2 were found higher for the high strain rate, whereas the reverse trend was observed for G3, G4, and G5. Moreover, the value of time constants τ1,τ2,τ3τ4, and τ5 were found higher for low strain rate. Statistical analysis shows no significant difference in the values of G5, τ4, and τ5 among the three strain rates. The proposed model was found capable to fit the stress-relaxation response of skin with great accuracy, e.g., root-mean-squared-error (RMSE) value equal to 0.015 ± 0.00012 MPa. Moreover, this hyper-viscoelastic model can be utilized: to quantify the effects of age and diseases on the skin; to simulate the stresses on sutures during large wound closure and impact loading. |
| Databáze: | OpenAIRE |
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