scholarly journals Tensile properties of a boron/nitrogen-doped carbon nanotube–graphene hybrid structure

2014 ◽  
Vol 5 ◽  
pp. 329-336 ◽  
Author(s):  
Kang Xia ◽  
Haifei Zhan ◽  
Ye Wei ◽  
Yuantong Gu
Keyword(s):  
Carbon Nanotube ◽  
Yield Strength ◽  
Tensile Properties ◽  
Young’S Modulus ◽  
Young's Modulus ◽  
Chemical Properties ◽  
Hybrid Structure ◽  
Three Dimensions ◽  
Hybrid Structures ◽  
Graphene Layers

Doping is an effective approach that allows for the intrinsic modification of the electrical and chemical properties of nanomaterials. Recently, a graphene and carbon nanotube hybrid structure (GNHS) has been reported, which extends the excellent properties of carbon-based materials to three dimensions. In this paper, we carried out a first-time investigation on the tensile properties of the hybrid structures with different dopants. It is found that with the presence of dopants, the hybrid structures usually exhibit lower yield strength, Young’s modulus, and earlier yielding compared to that of a pristine hybrid structure. For dopant concentrations below 2.5% no significant reduction of Young’s modulus or yield strength could be observed. For all considered samples, the failure is found to initiate at the region where the nanotubes and graphene sheets are connected. After failure, monatomic chains are normally observed around the failure region. Dangling graphene layers without the separation of a residual CNT wall are found to adhere to each other after failure with a distance of about 3.4 Å. This study provides a fundamental understanding of the tensile properties of the doped graphene–nanotube hybrid structures, which will benefit the design and also the applications of graphene-based hybrid materials.

Tensile properties of polyformaldehyde blends and nanocomposites

2015 ◽  
Vol 35 (5) ◽  
pp. 417-422
Author(s):  
Ji-Zhao Liang ◽  
Fang Wang
Keyword(s):  
Yield Strength ◽  
Tensile Properties ◽  
Young’S Modulus ◽  
Young's Modulus ◽  
Tensile Elongation ◽  
Weight Fraction ◽  
Ethylene Vinyl Acetate ◽  
Tensile Yield Strength ◽  
Test Machine ◽  
Experimental Conditions

Abstract The effects of the compositions and tensile rates on the tensile properties of the polyformaldehyde (POM)/ethylene-vinyl acetate copolymer (EVA)/high-density polyethylene (HDPE) blends and POM/EVA/HDPE composites filled with nanometer calcium carbonate were investigated by means of a tensile test machine at room temperature. The results showed that the Young’s modulus, tensile yield strength, and tensile elongation at break of the blends and the composites decreased nonlinearly with increase in the HDPE weight fraction; it should be attributed to the low stiffness and strength of the HDPE resin; the difference in the Young’s modulus and tensile yield strength between the blends and the composites was insignificant under the same experimental conditions. Both the Young’s modulus and tensile yield strength of the blends and the composites increased nonlinearly with increase in the tensile rate in the case of low tensile rate level. Moreover, the predictions of the Young’s modulus and tensile strength were roughly close to the measured data from the blends.

scholarly journals Anisotropic mechanical properties of fused deposition modeled parts fabricated by using acrylonitrile butadiene styrene polymer

2017 ◽  
Vol 37 (7) ◽  
pp. 699-706 ◽  
Author(s):  
Maksym Rybachuk ◽  
Charlène Alice Mauger ◽  
Thomas Fiedler ◽  
Andreas Öchsner
Keyword(s):  
Mechanical Properties ◽  
Yield Strength ◽  
Tensile Properties ◽  
Young’S Modulus ◽  
Young's Modulus ◽  
Acrylonitrile Butadiene Styrene ◽  
Fused Deposition Modelling ◽  
Fused Deposition ◽  
Anisotropic Mechanical Properties ◽  
Butadiene Styrene

Abstract The anisotropic mechanical properties of parts that are fabricated using acrylonitrile butadiene styrene (ABS) polymer relative to part-built orientation employing the fused deposition modelling process are reported in this work. ABSplus-P430 polymer was used to investigate the effects of infill orientation on the parts’ mechanical properties under tensile and compression loading. Results revealed that infill orientation strongly affected the tensile properties of fabricated ABS samples. Specifically, the values for Young’s modulus ranged from ~1.5 to ~2.1 GPa, ultimate tensile strength from ~12.0 to ~22.0 MPa, yield strength from ~1.0 to ~21.0 MPa, and elongation-at-break from ~0.2 to ~4.8% for different infill orientations. Samples with infill orientation aligned to the vertical (i.e. Z-) axis displayed the highest values relative to all other infill orientations investigated. Mechanical properties anisotropy was lower for parts under compressive loading, such that the Young’s modulus, ultimate compressive and yield strength were weakly correlated with infill orientation apart from samples whose built orientation was aligned at 45° to the vertical Z-axis. The latter samples displayed inferior mechanical properties under all compressive tests. The effects of sample gauge thickness on tensile properties and ABS sample micro- and bulk- hardness with respect to infill orientation are also discussed.

scholarly journals Tensile strengths and Young’s modulus of thin copper and copper-nickel (CuNi44) substrates

2008 ◽  
Vol 6 (4) ◽  
pp. 535-541 ◽  
Author(s):  
Oliver Staller ◽  
Christina Mitterbauer ◽  
Katharina Mayr
Keyword(s):  
Yield Strength ◽  
Young’S Modulus ◽  
Pole Figure ◽  
Vickers Hardness ◽  
Young's Modulus ◽  
Coated Conductors ◽  
Test Method ◽  
Tensile Yield Strength ◽  
Reducing Atmosphere ◽  
Cold Worked

AbstractIn this paper we report a method to determine tensile strengths and Young’s modulus of cubic biaxial textured metal tapes used as substrate materials for coated conductors (CC). Simplicity, rapidity and reproducibility of the procedure are important for the evaluation of continuous in-house productions. Our approach is based on the EN 10002-1 B tensile test method. A key role for satisfactory results is the sample preparation of 100–250 μm thick tapes, which will be described in detail. Copper (E-Cu57) can be successfully transformed to cubic biaxial textured substrates. Best results were achieved by annealing between 750°C and 850°C in reducing atmosphere. Best FWHM values for the ψ scan are 5.51° and for the ϕ scan are 4.5°. Pole figure analysis verified the sharp {001} texture of the tape. Vickers hardness measurements (HV 0.1) for the cold worked material yielded values of 135 and for the annealed tape, values of 37. The ultimate tensile yield strength Rm of the textured substrate is 150 MPa and thus significantly lower than that for the cold worked material (413 MPa). Cubic biaxial substrates could be manufactured from Isotan CuNi44 (WM49) bars. Best results were achieved by annealing at 1200°C in reducing atmosphere. Pole figure analysis verified the {001} texture with other low intensity texture components. Vickers hardness measurements (HV 0.1) for the cold worked material yielded values of 236 and for the annealed tape values of 92. The ultimate tensile yield strength R m of the textured substrate is 300 MPa and thus significantly lower than that for the cold worked material (723 MPa).

A New Method Developed for Brittle and Ductile Materials to Evaluate Mechanical Properties of a Lump Specimen in the Use of Indentation Test

2006 ◽  
Vol 129 (2) ◽  
pp. 284-292 ◽  
Author(s):  
Pal Jen Wei ◽  
Jen Fin Lin
Keyword(s):  
Yield Strength ◽  
Young’S Modulus ◽  
Young's Modulus ◽  
Elastic Recovery ◽  
Indentation Test ◽  
New Method ◽  
Ductile Materials ◽  
Conventional Material ◽  
Loading And Unloading ◽  
Logarithm Function

In this study, the load-depth (P‐h) relationships matching the experimental results of the nanoindentation tests exhibited at the subregions of small and large depths are obtained, respectively. The relationships associated with these two subregions are then linked by the hyperbolic logarithm function to attain a single expression that is applied in the evaluation of the specimen’s elastic recovery ability, as shown in the unloading process. A new method is developed in the present study to evaluate both Young’s modulus and the yield strength of either a ductile or brittle material through the uses of the appropriate P‐h relationships developed in the load and unloading processes. The results of the Young’s modulus and the yield strength achieved by the present method are compared to those obtained from the conventional material tests for a lump material. The scattering of the experimental data shown in the loading and unloading processes are also interpreted by different causes.

Effect of temperature on properties of aluminum/single-walled carbon nanotube nanocomposite by molecular dynamics simulation

2019 ◽  
Vol 234 (2) ◽  
pp. 635-642 ◽  
Author(s):  
Mohsen Motamedi ◽  
AH Naghdi ◽  
SK Jalali
Keyword(s):  
Mechanical Properties ◽  
Molecular Dynamics ◽  
Carbon Nanotube ◽  
Molecular Dynamics Simulation ◽  
Young’S Modulus ◽  
Young's Modulus ◽  
Strain Curve ◽  
Dynamics Simulation ◽  
Effect Of Temperature ◽  
Metal Composite

Composite materials have become popular because of high mechanical properties and lightweight. Aluminum/carbon nanotube is one of the most important metal composite. In this research, mechanical properties of aluminum/carbon nanotube composite were obtained using molecular dynamics simulation. Then, effect of temperature on stress–strain curve of composite was studied. The results showed by increasing temperature, the Young’s modulus of composite was decreased. More specifically increasing the temperature from 150 K to 620 K, decrease the Young’s modulus to 11.7%. The ultimate stress of composite also decreased by increasing the temperature. A continuum model of composite was presented using finite element method. The results showed the role of carbon nanotube on strengthening of composite.

Electrophoretic Deposition of Single Wall Carbon Nanotube Films and Characterization

2014 ◽  
Vol 1752 ◽  
pp. 59-63
Author(s):  
Junyoung Lim ◽  
Maryam Jalali ◽  
Stephen A. Campbell
Keyword(s):  
Carbon Nanotube ◽  
Film Thickness ◽  
Young’S Modulus ◽  
Electrophoretic Deposition ◽  
Flexible Electronics ◽  
Rutherford Backscattering Spectrometry ◽  
Young's Modulus ◽  
Single Wall Carbon Nanotube ◽  
Single Wall Carbon ◽  
Nanotube Films

ABSTRACTElectrophoretic deposition enables the rapid deposition of single wall carbon nanotube films at room temperature. An accurate, reproducible film thickness can be obtained by controlling electric field strength, suspension concentration, and time. To investigate the electrical and mechanical properties of such films, we recorded electric resistance and Young’s modulus using I-V characterization and a nanoindenter, respectively. The measured resistivity of the films varied from 2.14 × 10-3 to 7.66 × 10-3 Ω·cm, and the Young’s modulus was 4.72 to 5.67 GPa, independent of film thickness from 77 to 134 nm. These results indicated that the mechanical and electrical properties of film are comparable with previously reported methods such as layer by layer deposition even though we achieved much higher deposition rates. We also measured the film mass density which is usually unrecorded even though it is an important parameter for MEMS/NEMS device actuation. The film density was found with conventional thickness measurement and Rutherford backscattering spectrometry. It varied from 0.12 to 0.54 g/cm3 as the film thickness increased. This method could be extended to applications of CNT films for flexible electronics or high frequency RF MEMS devices.

scholarly journals Investigation on Nanocomposite Membrane of Multiwalled Carbon Nanotube Reinforced Polycarbonate Blend for Gas Separation

2016 ◽  
Vol 2016 ◽  
pp. 1-9 ◽  
Author(s):  
Ayesha Kausar
Keyword(s):  
Carbon Nanotube ◽  
Young’S Modulus ◽  
Gas Separation ◽  
Vinylidene Fluoride ◽  
Young's Modulus ◽  
Multiwalled Carbon Nanotube ◽  
Nanocomposite Membrane ◽  
Polymeric Membrane ◽  
Multiwalled Carbon ◽  
Phase Inversion Technique

Carbon nanotube has been explored as a nanofiller in high performance polymeric membrane for gas separation. In this regard, nanocomposite membrane of polycarbonate (PC), poly(vinylidene fluoride-co-hexafluoropropylene) (PVFHFP), and multiwalled carbon nanotube (MWCNT) was fabricated via phase inversion technique. Poly(ethylene glycol) (PEG) was employed for the compatibilization of the blend system. Two series of PC/PVFHFP/PEG were developed using purified P-MWCNT and acid functional A-MWCNT nanofiller. Scanning and transmission electron micrographs have shown fine nanotube dispersion and wetting by matrix, compared with the purified system. Tensile strength and Young’s modulus of PC/PVFHFP/PEG/MWCNT-A 1–5 were found to be in the range of 63.6–72.5 MPa and 110.6–122.1 MPa, respectively. The nanocomposite revealed 51% increase in Young’s modulus and 28% increase in tensile stress relative to the pristine blend. The A-MWCNT was also effective in enhancing the permselectivity αCO2/N2 (31.2–39.9) of nanocomposite membrane relative to the blend membrane (21.6). The permeability PCO2 of blend was 125.6 barrer; however, the functional series had enhanced PCO2 values ranging from 142.8 to 186.6 barrer. Moreover, A-MWCNT loading improved the gas diffusivity of PC/PVFHFP/PEG/MWCNT-A 1–5; however, filler content did not significantly influence the CO2 and N2 solubility.

Commercial potato protein concentrate as a novel source for thermoformed bio-based plastic films with unusual polymerisation and tensile properties

RSC Advances ◽  
2015 ◽  
Vol 5 (41) ◽  
pp. 32217-32226 ◽  
Author(s):  
William R. Newson ◽  
Faiza Rasheed ◽  
Ramune Kuktaite ◽  
Mikael S. Hedenqvist ◽  
Mikael Gällstedt ◽  
...  
Keyword(s):  
Tensile Properties ◽  
Young’S Modulus ◽  
Young's Modulus ◽  
Processing Temperature ◽  
Protein Concentrate ◽  
Potato Protein ◽  
Plastic Films ◽  
Commercial Potato ◽  
Observed Behaviour

Films thermoformed from commercial potato protein concentrate exhibited a constant Young's modulus and increasing strain at break with increasing processing temperature, in contrast to the usually observed behaviour for protein-based materials.

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