Improving the bond strength at hybrid-yarn textile thermoplastic composites for high-technology applications by laser radiation

The past two decades have been marked by an increased interest in the synthesis and the properties of geoinspired hydrosilicate nanoscrolls and nanotubes. The present review considers three main representatives of this group: halloysite, imogolite and chrysotile. These hydrosilicates have the ability of spontaneous curling (scrolling) due to a number of crystal structure features, including the size and chemical composition differences between the sheets, (or the void in the gibbsite sheet and SiO2 tetrahedron, in the case of imogolite). Mineral nanoscrolls and nanotubes consist of the most abundant elements, like magnesium, aluminium and silicon, accompanied by uncontrollable amounts of impurities (other elements and phases), which hinder their high technology applications. The development of a synthetic approach makes it possible to not only to overcome the purity issues, but also to enhance the chemical composition of the nanotubular particles by controllable cation doping. The first part of the review covers some principles of the cation doping approach and proposes joint criteria for the semiquantitative prediction of morphological changes that occur. The second part focuses on some doping-related properties and applications, such as morphological control, uptake and release, magnetic and mechanical properties, and catalysis.

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Characterization and Numerical Modelling of Through-Thickness Metallic-Pin-Reinforced Fibre/Thermoplastic Composites under Bending Loading

Journal of Composites Science ◽

10.3390/jcs4040188 ◽

2020 ◽

Vol 4 (4) ◽

pp. 188

Author(s):

Holger Böhm ◽

Hailun Zhang ◽

Benjamin Gröger ◽

Andreas Hornig ◽

Maik Gude

Keyword(s):

Mechanical Properties ◽

Numerical Modelling ◽

Matrix Cracking ◽

Thermoplastic Composites ◽

Continuum Damage Mechanic ◽

Damage Mechanic ◽

Hybrid Yarn ◽

Cohesive Zone Modelling ◽

Delamination Resistance ◽

Plane Direction

Through-Thickness Reinforcement (TTR) technologies are well suited to improving the mechanical properties in the out-of-plane direction of fibre-reinforced composites. However, besides the enhancement of delamination resistance and thus the prevention of overall catastrophic failure, the presence of additional reinforcement elements in the composite structure affects also the mechanical properties in in-plane direction. In this work, the flexural behaviour of a glass-polypropylene (GF/PP) hybrid yarn-based composite with TTR in form of metallic pins has been investigated experimentally and numerically. The insertion of the metallic pins is realized via thermoactivated pinning technology (TAP). In four-point-bending tests, it is shown that the flexural stiffness and strength decreases with an increase of the overall pin density. Hereby, it is observed that the pins act as crack initiators. For numerical modelling on specimen level, a continuum damage mechanic (CDM) model is used to predict the nonlinear deformation response of the composite, as well as fibre fracture and matrix cracking. A debonding and slipping phenomena of the pin in the composite is modelled by a cohesive zone modelling approach for the interface between pin and composite.

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Analysing and modelling the 3D shear damage behaviour of hybrid yarn textile-reinforced thermoplastic composites

Composite Structures ◽

10.1016/j.compstruct.2011.07.010 ◽

2011 ◽

Vol 94 (1) ◽

pp. 121-131 ◽

Cited By ~ 14

Author(s):

W. Hufenbach ◽

A. Langkamp ◽

A. Hornig ◽

M. Zscheyge ◽

R. Bochynek

Keyword(s):

Thermoplastic Composites ◽

Shear Damage ◽

Hybrid Yarn

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1D Nanostructure-Based Piezo-Generators

Nanomaterials ◽

10.3390/nano9101474 ◽

2019 ◽

Vol 9 (10) ◽

pp. 1474

Author(s):

Noelle Gogneau

Keyword(s):

Energy Consumption ◽

Daily Life ◽

High Technology ◽

Technology Applications ◽

1D Nanostructure

With the amount of connected objects constantly on the rise, both in our daily life and in high-technology applications, it becomes critical to deal with their associated increase in energy consumption [...]

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Joule heating of dry textiles made of recycled carbon fibers and PA6 for the series production of thermoplastic composites

Journal of Engineered Fibers and Fabrics ◽

10.1177/1558925020905828 ◽

2020 ◽

Vol 15 ◽

pp. 155892502090582 ◽

Cited By ~ 2

Author(s):

Julian Reese ◽

Michael Vorhof ◽

Gerald Hoffmann ◽

Kurt Böhme ◽

Chokri Cherif

Keyword(s):

Carbon Fibers ◽

Joule Heating ◽

Thermoplastic Composites ◽

Fiber Direction ◽

Molding Process ◽

Transverse Fiber ◽

Hybrid Yarn ◽

Thermoplastic Matrix ◽

One Step ◽

Macroscopic Parameters

Processing carbon fiber reinforced thermoplastic parts includes heating to form the thermoplastic matrix. The needed heat can be applied externally or internally to the preform. One possibility to generate intrinsic heat involves the use of carbon fibers as a resistive element to induce joule heat. So far, most research efforts have been based on contacting continuous carbon fibers on both ends to melt the thermoplastic matrix of a pre-impregnated preform. The objective of this project is to use a dry hybrid yarn textile in a one-step process to impregnate and rapidly consolidate the dry textile in less than a minute. The desired molding process is based on joule heating of carbon fibers due to an applied current in the transverse fiber direction. This article focuses on the detection of the involved macroscopic parameters. The first composites produced by means of this new method exhibit a high potential with heating times of 15 s, a void fraction below 1%, and flexural properties comparable to the state of the art.

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ChemInform Abstract: Magnetic Meta-Materials for High-Technology Applications

ChemInform ◽

10.1002/chin.200807219 ◽

2008 ◽

Vol 39 (7) ◽

Author(s):

G. C. Hadjipanayis ◽

M. Marinescu ◽

Y. H. Huang ◽

M. J. Bonder ◽

A. Gabay

Keyword(s):

High Technology ◽

Technology Applications

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Components and circuits in high technology applications

10.1109/pesc.1981.7083627 ◽

1981 ◽

Keyword(s):

High Technology ◽

Technology Applications

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High Technology Applications of Barium and Strontium Ferrite Magnets

Materials Science Forum ◽

10.4028/www.scientific.net/msf.881.134 ◽

2016 ◽

Vol 881 ◽

pp. 134-139 ◽

Cited By ~ 1

Author(s):

Marcos Flavio de Campos ◽

Daniel Rodrigues

Keyword(s):

Barium Ferrite ◽

High Efficiency ◽

Low Cost ◽

Cost Benefit ◽

High Technology ◽

Strontium Ferrite ◽

Metallic Alloys ◽

Advantages And Disadvantages ◽

Technology Applications ◽

Wet Condition

Ceramic magnets as barium ferrite or strontium ferrite have many applications in high technology. One of the reasons is the low cost when compared to competitor materials, as Alnico, MnBi, MnAl or NdFeB. In this study, the advantages and disadvantages of Ba and Sr ferrite magnets are discussed. One clear advantage is that ferrites are already oxides, and do not present the corrosion problems typical of NdFeB and other metallic alloys. As ferrites are oxides, the processing is much easier and cheaper. For example sintering can be done at air, and milling under wet condition. One of the main conclusions is the excellent ratio cost/benefit of ferrites, giving advantage in many applications. Special attention is given for application of ferrites in high efficiency motors.

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Effects of Coupling Agent and Thermoplastic on the Interfacial Bond Strength and the Mechanical Properties of Oriented Wood Strand–Thermoplastic Composites

Polymers ◽

10.3390/polym13234260 ◽

2021 ◽

Vol 13 (23) ◽

pp. 4260

Author(s):

Ziling Shen ◽

Zhi Ye ◽

Kailin Li ◽

Chusheng Qi

Keyword(s):

Mechanical Properties ◽

Bond Strength ◽

Physical Properties ◽

Coupling Agent ◽

Modulus Of Rupture ◽

Thermoplastic Composites ◽

Interfacial Bond ◽

Interfacial Bond Strength ◽

Factors Affecting ◽

Mechanical And Physical Properties

Wood–plastic composites (WPC) with good mechanical and physical properties are desirable products for manufacturers and customers, and interfacial bond strength is one of the most critical factors affecting WPC performance. To verify that a higher interfacial bond strength between wood and thermoplastics improves WPC performance, wood veneer–thermoplastic composites (VPC) and oriented strand–thermoplastic composites (OSPC) were fabricated using hot pressing. The effects of the coupling agent (KH550 or MDI) and the thermoplastic (LDPE, HDPE, PP, or PVC) on the interfacial bond strength of VPC, and the mechanical and physical properties of OSPC, were investigated. The results showed that coupling agents KH550 and MDI improved the interfacial bond strength between wood and thermoplastics under dry conditions. MDI was better than KH550 at improving the interfacial bond strength and the mechanical properties of OSPC. Better interfacial bonding between plastic and wood improved the OSPC performance. The OSPC fabricated using PVC film as the thermoplastic and MDI as the coupling agent displayed the highest mechanical properties, with a modulus of rupture of 91.9 MPa, a modulus of elasticity of 10.9 GPa, and a thickness swelling of 2.4%. PVC and MDI are recommended to fabricate WPCs with desirable performance for general applications.

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