Classical micromechanics modeling of nanocomposites with carbon nanofibers and interphase

2011 ◽  
Vol 45 (23) ◽  
pp. 2401-2413 ◽  
Author(s):  
Jaesang Yu ◽  
Thomas E. Lacy ◽  
Hossein Toghiani ◽  
Charles U. Pittman ◽  
Youngkeun Hwang
Keyword(s):  
Cross Section ◽  
Elastic Moduli ◽  
Carbon Nanofiber ◽  
Hollow Nanofibers ◽  
Multilayered Coatings ◽  
Notable Effect ◽  
Self Consistent ◽  
Micromechanics Modeling ◽  
Force Displacement ◽  
Composite Properties

A micromechanics parametric study was performed to investigate the effect of carbon nanofiber morphology (i.e. hollow vs. solid cross-section), nanofiber waviness, and both nanofiber–resin interphase properties and dimensions on bulk nanocomposite elastic moduli. Mori–Tanaka and self-consistent models were developed for composites containing heterogeneities with multilayered coatings. For a given nanofiber axial force–displacement relationship, the elastic modulus for hollow nanofibers can significantly exceed that for solid nanofibers resulting in notable differences in bulk nanocomposite properties. In addition, the development of a nanofiber–resin interphase had a notable effect on the bulk elastic moduli. Consistent with results from the literature, small degrees of nanofiber waviness resulted in a significant decrease in effective composite properties.

The Effect of Microstructural Morphologies on the Effective Electromechanical Properties of Piezoelectric Particle Composites

2012 ◽  
Author(s):  
Vahid Tajeddini ◽  
Chien-hong Lin ◽  
Anastasia Muliana ◽  
Martin Lévesque
Keyword(s):  
Mechanical Properties ◽  
Elastic Moduli ◽  
Volume Fraction ◽  
Micromechanical Model ◽  
Three Dimensional ◽  
Particle Sizes ◽  
Reinforced Composites ◽  
Electromechanical Properties ◽  
Particle Volume ◽  
Self Consistent

This study introduces a micromechanical model that incorporates detailed microstructures for analyzing the effective electro-mechanical properties, such as piezoelectric and permittivity constants as well as elastic moduli, of piezoelectric particle reinforced composites. The studied composites consist of polarized spherical piezoelectric particles dispersed into a continuous and elastic polymeric matrix. A micromechanical model generated using three-dimensional (3D) continuum elements within a finite element (FE) framework. For each volume fraction (VF) of particles, realization with different particle sizes and arrangements were generated in order to represent microstructures of a particle composite. We examined the effects of microstructural morphologies, such as particle sizes and distributions, and particle volume fractions on the overall effective electro-mechanical properties of the active composites. The overall electro-mechanical properties determined from the present micromechanical model were compared to those generated using the Mori-Tanaka, self-consistent, and simplified unit-cell micromechanical models.

Self-consistent elastic moduli of a cracked solid

1982 ◽  
Vol 9 (8) ◽  
pp. 903-906 ◽  
Author(s):  
Frank S. Henyey ◽  
Neil Pomphrey
Keyword(s):  
Elastic Moduli ◽  
Self Consistent

scholarly journals Model-Based Experimental Development of Passive Compliant Robot Legs from Fiberglass Composites

2015 ◽  
Vol 2015 ◽  
pp. 1-14 ◽  
Author(s):  
Shang-Chang Lin ◽  
Chia-Jui Hu ◽  
Wen-Pin Shih ◽  
Pei-Chun Lin
Keyword(s):  
Elastic Moduli ◽  
Curved Beam ◽  
Spring Model ◽  
Hexapod Robot ◽  
Experimental Development ◽  
Circular Shape ◽  
Displacement Experiments ◽  
Compliant Robot ◽  
Force Displacement ◽  
Beam Mechanics

We report on the methodology of developing compliant, half-circular, and composite robot legs with designable stiffness. First, force-displacement experiments on flat cantilever composites made by one or multifiberglass cloths are executed. By mapping the cantilever mechanics to the virtual spring model, the equivalent elastic moduli of the composites can be derived. Next, by using the model that links the curved beam mechanics back to the virtual spring, the resultant stiffness of the composite in a half-circular shape can be estimated without going through intensive experimental tryouts. The overall methodology has been experimentally validated, and the fabricated composites were used on a hexapod robot to perform walking and leaping behaviors.

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