Frequency dependent inelastic response of collagen architecture of pig dermis under cyclic tensile loading: An experimental study
| Autor: | Sachin Kumar, Piyush Lakhani, Navin Kumar, Krashn K. Dwivedi |
|---|---|
| Rok vydání: | 2020 |
| Předmět: |
Tropocollagen
Materials science Swine Scanning electron microscope Biomedical Engineering 02 engineering and technology Biomaterials Stress (mechanics) 03 medical and health sciences 0302 clinical medicine Dermis Elastic Modulus Ultimate tensile strength medicine Animals Softening Elastic modulus Skin Strain (chemistry) 030206 dentistry 021001 nanoscience & nanotechnology medicine.anatomical_structure Mechanics of Materials Biophysics Collagen Stress Mechanical 0210 nano-technology |
| Zdroj: | Journal of the Mechanical Behavior of Biomedical Materials. 112:104030 |
| ISSN: | 1751-6161 |
| DOI: | 10.1016/j.jmbbm.2020.104030 |
| Popis: | The evaluation of collagen architecture of the dermis in response to mechanical stimulation is important as it affects the macroscopic mechanical properties of the dermis. A detailed understanding of the processes involved in the alteration of the collagen structure is required to correlate the mechanical stimulation with tissue remodeling. This study investigated the effect of cyclic frequencies i.e. low (0.1 Hz), medium (2.0 Hz), and high (5.0 Hz) (physiological range) in the alteration of pig dermis collagen structure and its correlation with the macroscopic mechanical response of the dermis. The assessment of the collagen structure of virgin and mechanical tested specimens at tropocollagen, collagen fibril, and fiber level was performed using Fourier-transform infrared-attenuated total reflection (FTIR-ATR), atomic force microscopy (AFM), and scanning electron microscopy (SEM) respectively. After 103 cycles, a significantly higher alteration in collagen structure with discrete plastic-type damage was found for low frequency. This frequency dependent alteration of the collagen structure was found in correlation with the dermis macroscopic response. The value of inelastic strain, stress softening, damage parameter (reduction in elastic modulus), and reduction in energy dissipation were observed significantly large for slow frequency. A power-law based empirical relations, as a function of frequency and number of cycles, were proposed to predict the value of inelastic strain and damage parameter. This study also suggests that hierarchical structural response against the mechanical stimulation is time-dependent rather than cycle-dependent, may affect the tissue remodeling. |
| Databáze: | OpenAIRE |
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