Multiscale modeling of the elastic moduli of CNT-reinforced polymers and fitting of efficiency parameters for the use of the extended rule-of-mixtures

Fibre-reinforced polymers (FRPs) have been successfully applied to the strengthening of reinforced concrete structures and a similar methodology is adopted by researchers in order to strengthen timber structures using synthetic fibres such as carbon, glass or aramid fibres. This paper explores the viability of using fibres from botanical sources for the reinforcement of timber structures. In this study, two natural fibre materials, namely kenaf and ramie, in combination with a polymeric matrix, are tested for their tensile properties in accordance with ASTM D 4018-99. The results indicate that kenaf fibres exhibit average ultimate tensile strength value at rupture of 750 MPa and Young’s modulus of 58 GPa. The test results also show that the corresponding parameters for ramie fibres average at 810 MPa and 36 GPa respectively. These values are closer to those of timber as opposed to analogous values for carbon and glass fibres. The strength and elastic moduli compatibility of both kenaf and ramie fibres with timber and contrast with carbon and glass fibres is further discussed in relation to the viability of using these natural fibres as reinforcement for timber.

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Processing and Properties of Graphene-Based Nanocomposites

Applied Mechanics ◽

10.1115/imece2004-61283 ◽

2004 ◽

Cited By ~ 2

Author(s):

Shing-Chung Wong ◽

Eric M. Sutherland ◽

Suchitra Yerramaddu ◽

Erwin Wouterson ◽

Fawn M. Uhl ◽

...

Keyword(s):

Dielectric Properties ◽

Elastic Moduli ◽

Carbon Nanomaterials ◽

Lower Cost ◽

Filler Content ◽

Dynamics Simulation ◽

Reinforced Polymers ◽

Structural Composite ◽

Electrical And Dielectric Properties ◽

Graphene Platelets

Fabrication of carbon nanotubes is expensive, particularly for the purifying process required to make them widely accepted for reinforcements and structural composite applications. Instead of trying to discover lower cost processes for nanotubes, we seek to develop an alternative nanoscale carbon material with comparable properties that can be produced cost-effectively and in larger quantities. These carbon nanomaterials are referred to as nanoscale graphene platelets (NGP). In this study, we fabricated and studied graphene-based nanocomposites by (1) exfoliating carbon or graphite materials using acid treatment, thermal and microwave expansion, and (2) examined the electrical and dielectric properties of the graphite reinforced polymers. Less than 1 wt% filler content was required to reach the percolation threshold (φc) of transition in electrical conductivity and dielectric properties. Molecular dynamics simulation was employed to characterize the increase in elastic moduli for graphene platelets embedded in polymer matrices at molecular scale.

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Predictive multiscale modeling for Unidirectional Carbon Fiber Reinforced Polymers

Composites Science and Technology ◽

10.1016/j.compscitech.2019.107922 ◽

2020 ◽

Vol 186 ◽

pp. 107922 ◽

Cited By ~ 5

Author(s):

Jiaying Gao ◽

Modesar Shakoor ◽

Gino Domel ◽

Matthias Merzkirch ◽

Guowei Zhou ◽

...

Keyword(s):

Carbon Fiber ◽

Multiscale Modeling ◽

Fiber Reinforced Polymers ◽

Fiber Reinforced ◽

Carbon Fiber Reinforced Polymers ◽

Reinforced Polymers ◽

Carbon Fiber Reinforced

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The Rule of Mixtures: Approximating Chorioamnion Elastic Modulus in Human Placental Membranes

Volume 1B: Extremity; Fluid Mechanics; Gait; Growth, Remodeling, and Repair; Heart Valves; Injury Biomechanics; Mechanotransduction and Sub-Cellular Biophysics; MultiScale Biotransport; Muscle, Tendon and Ligament; Musculoskeletal Devices; Multiscale Mechanics; Thermal Medicine; Ocular Biomechanics; Pediatric Hemodynamics; Pericellular Phenomena; Tissue Mechanics; Biotransport Design and Devices; Spine; Stent Device Hemodynamics; Vascular Solid Mechanics; Student Paper and Design Competitions ◽

10.1115/sbc2013-14692 ◽

2013 ◽

Author(s):

Carly A. Barnard ◽

Brandi N. Briggs ◽

Virginia L. Ferguson

Keyword(s):

Elastic Modulus ◽

Preterm Birth ◽

Elastic Moduli ◽

In Utero ◽

The Body ◽

Morbidity And Mortality ◽

Rule Of Mixtures ◽

Infant Morbidity ◽

Bilayered Structure ◽

Placental Membranes

The placental membranes, which surround the fetus in utero, are made of chorioamnion (CA) — a composite bilayered structure made of amnion and chorion. The CA is the only tissue in the body designed to fail, yet early CA failure causes preterm birth and is associated with elevated infant morbidity and mortality 1. While the elastic moduli, E, of the chorion and the amnion have been independently investigated 1,2,3, how these two layers work together in the composite CA bilayer has yet to be thoroughly investigated.

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