A predictive model for the mechanical behavior of particulate composites. Part II: Comparison of model predictions to literature data

1993 ◽  
Vol 33 (22) ◽  
pp. 1466-1474 ◽  
Author(s):  
Lori Anderson Vratsanos ◽  
Richard J. Farris
Keyword(s):  
Mechanical Behavior ◽  
Predictive Model ◽  
Particulate Composites ◽  
Model Predictions

Poroelastic Model of Trabecular Bone in Uniaxial Strain Conditions

1998 ◽  
Vol 02 (02) ◽  
pp. 167-180 ◽  
Author(s):  
Tae-Hong Lim ◽  
Jung Hwa Hong
Keyword(s):  
Mechanical Behavior ◽  
Trabecular Bone ◽  
Uniaxial Strain ◽  
Deformation Model ◽  
Total Stress ◽  
Model Predictions ◽  
Poroelastic Model ◽  
Good Agreement ◽  
The Continuum

A one-dimensional poroelastic model of trabecular bone was developed to investigate the fluid effect on the mechanical behavior at the continuum level. The poroelastic properties were determined based upon an assumed drained Poisson's ratio of 0.3 and experimental results reported in the literature. Even though the free escape of the fluid through the loading end was allowed during deformation, model predictions showed that the pore pressure generated within trabecular bone would cause significant variations in total stress. The total stress increase resulted in a stiffening of trabecular bone, which supports the concept of hydraulic stiffening that has been advocated by several investigators. Model predictions showed a good agreement to the mechanical behaviors of trabecular bone specimens with marrow in situ in a uniaxial strain condition observed in previous studies. These results support the hypothesis that trabecular bone is poroelastic and the fluid effect on the mechanical behavior at the continnum level is significant. Thus, the incorporation of the fluid effect in future studies is recommended to improve our understanding of mechanical behavior of trabecular bone.

scholarly journals Tunable Mechanical Behavior of Carbon Nanoscroll Crystals Under Uniaxial Lateral Compression

2013 ◽  
Vol 81 (2) ◽  
Author(s):  
Xinghua Shi ◽  
Qifang Yin ◽  
Nicola M. Pugno ◽  
Huajian Gao
Keyword(s):  
Molecular Dynamics ◽  
Mechanical Behavior ◽  
Artificial Muscles ◽  
Lateral Compression ◽  
Compression Behavior ◽  
Model Predictions ◽  
Absorbing Materials ◽  
Carbon Nanoscrolls ◽  
Dynamics Simulations ◽  
Energy Absorbing

A theoretical model is developed to investigate the mechanical behavior of closely packed carbon nanoscrolls (CNSs), the so-called CNS crystals, subjected to uniaxial lateral compression/decompression. Molecular dynamics simulations are performed to verify the model predictions. It is shown that the compression behavior of a CNS crystal can exhibit strong hysteresis that may be tuned by an applied electric field. The present study demonstrates the potential of CNSs for applications in energy-absorbing materials as well as nanodevices, such as artificial muscles, where reversible and controllable volumetric deformations are desired.

scholarly journals Mechanical Behavior of Collagen-Fibrin Co-Gels Reflects Transition From Series to Parallel Interactions With Increasing Collagen Content

2012 ◽  
Vol 134 (1) ◽  
Author(s):  
Victor K. Lai ◽  
Spencer P. Lake ◽  
Christina R. Frey ◽  
Robert T. Tranquillo ◽  
Victor H. Barocas
Keyword(s):  
Mechanical Behavior ◽  
The Body ◽  
Collagen Content ◽  
Upper And Lower Bounds ◽  
Scale Model ◽  
Parallel Model ◽  
Modeling Framework ◽  
Composite Systems ◽  
Pure Collagen ◽  
Model Predictions

Fibrin and collagen, biopolymers occurring naturally in the body, are biomaterials commonly-used as scaffolds for tissue engineering. How collagen and fibrin interact to confer macroscopic mechanical properties in collagen-fibrin composite systems remains poorly understood. In this study, we formulated collagen-fibrin co-gels at different collagen-to-fibrin ratios to observe changes in the overall mechanical behavior and microstructure. A modeling framework of a two-network system was developed by modifying our micro-scale model, considering two forms of interaction between the networks: (a) two interpenetrating but noninteracting networks (“parallel”), and (b) a single network consisting of randomly alternating collagen and fibrin fibrils (“series”). Mechanical testing of our gels show that collagen-fibrin co-gels exhibit intermediate properties (UTS, strain at failure, tangent modulus) compared to those of pure collagen and fibrin. The comparison with model predictions show that the parallel and series model cases provide upper and lower bounds, respectively, for the experimental data, suggesting that a combination of such interactions exists between the collagen and fibrin in co-gels. A transition from the series model to the parallel model occurs with increasing collagen content, with the series model best describing predominantly fibrin co-gels, and the parallel model best describing predominantly collagen co-gels.

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