Mesomodel of the mechanical behavior of biological tissues under low-energy impact taking into account their layered structure

2020 ◽  
Author(s):  
G. M. Eremina ◽  
A. Yu. Smolin
Keyword(s):  
Mechanical Behavior ◽  
Layered Structure ◽  
Biological Tissues ◽  
Low Energy ◽  
Energy Impact

Modeling the Large Deformation and Microstructure Evolution of Nonwoven Polymer Fiber Networks

2018 ◽  
Vol 86 (1) ◽  
Author(s):  
Mang Zhang ◽  
Yuli Chen ◽  
Fu-pen Chiang ◽  
Pelagia Irene Gouma ◽  
Lifeng Wang
Keyword(s):  
Mechanical Properties ◽  
Aspect Ratio ◽  
Mechanical Behavior ◽  
Large Deformation ◽  
Biological Tissues ◽  
High Porosity ◽  
Polymer Fiber ◽  
Fiber Networks ◽  
Fiber Aspect Ratio ◽  
Network Microstructure

The electrospinning process enables the fabrication of randomly distributed nonwoven polymer fiber networks with high surface area and high porosity, making them ideal candidates for multifunctional materials. The mechanics of nonwoven networks has been well established for elastic deformations. However, the mechanical properties of the polymer fibrous networks with large deformation are largely unexplored, while understanding their elastic and plastic mechanical properties at different fiber volume fractions, fiber aspect ratio, and constituent material properties is essential in the design of various polymer fibrous networks. In this paper, a representative volume element (RVE) based finite element model with long fibers is developed to emulate the randomly distributed nonwoven fibrous network microstructure, enabling us to systematically investigate the mechanics and large deformation behavior of random nonwoven networks. The results show that the network volume fraction, the fiber aspect ratio, and the fiber curliness have significant influences on the effective stiffness, effective yield strength, and the postyield behavior of the resulting fiber mats under both tension and shear loads. This study reveals the relation between the macroscopic mechanical behavior and the local randomly distributed network microstructure deformation mechanism of the nonwoven fiber network. The model presented here can also be applied to capture the mechanical behavior of other complex nonwoven network systems, like carbon nanotube networks, biological tissues, and artificial engineering networks.

ANTICYTOSKELETAL DRUGS AND TIME CULTURE EFFECTS UPON THE MECHANICAL BEHAVIOR OF DERMAL EQUIVALENT TISSUE SUBMITTED TO UNCONFINED COMPRESSION LOADING

2008 ◽  
Vol 08 (03) ◽  
pp. 339-352 ◽  
Author(s):  
S. RAMTANI ◽  
D. GEIGER
Keyword(s):  
Mechanical Behavior ◽  
Internal State ◽  
Skin Grafting ◽  
Biological Tissues ◽  
Matrix Remodeling ◽  
Unconfined Compression ◽  
Compression Loading ◽  
Dermal Equivalent ◽  
Variable Approach ◽  
Time Culture

The dermal equivalent (DE), a dermis substitute consisting of human skin fibroblasts growing into a three-dimensional collagen matrix, is extensively used in many applications: wound-healing response, pharmacological studies, skin grafting, fibroblast proliferation and migration, extracellular matrix remodeling, and efficacy of cosmetic products. The widespread growth of numerical modeling in biomechanical research has placed a heightened emphasis on accurate material property data for soft biological tissues, in particular for equivalent dermis which has not been so thoroughly investigated. Under unconfined compression loading, the effects of the strain rate, time culture, and cytoskeleton-disrupting agents are experimentally investigated. In order to model the observed mechanical behavior of the DE under the above conditions, the internal state variable approach is adopted for finite deformation viscoelasticity and the optimized material parameters are identified with respect to the stated thermodynamic restriction (i.e. positive viscous dissipation).

Compressive Strength of Composite/Concrete Cylinders after Low Energy Impact

2001 ◽  
Vol 20 (10) ◽  
pp. 849-870
Author(s):  
Hsien-Kuang Liu ◽  
Zhi- Chen ◽  
Nyan-Hwa Tai ◽  
Zhi- Chen
Keyword(s):  
Compressive Strength ◽  
Low Energy ◽  
Energy Impact ◽  
Concrete Cylinders
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