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

2011 ◽  
Vol 94 (1) ◽  
pp. 121-131 ◽  
Author(s):  
W. Hufenbach ◽  
A. Langkamp ◽  
A. Hornig ◽  
M. Zscheyge ◽  
R. Bochynek
Keyword(s):  
Thermoplastic Composites ◽  
Shear Damage ◽  
Hybrid Yarn

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

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.

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

2020 ◽  
Vol 15 ◽  
pp. 155892502090582 ◽  
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.

Study of mechanical behavior of Kevlar/polypropylene hybrid yarns and their composites

2011 ◽  
Vol 31 (2-3) ◽  
Author(s):  
Jagannath Sardar
Keyword(s):  
Mechanical Characteristics ◽  
Volume Fraction ◽  
Void Volume Fraction ◽  
Thermoplastic Composites ◽  
Weight Percentage ◽  
Lower Weight ◽  
Hybrid Yarn ◽  
Low Elastic Modulus ◽  
Polypropylene Matrix ◽  
Composite Samples

Abstract In this paper, the mechanical characteristics of Kevlar multi-filament-polypropylene (KV M/F-PP) hybrid yarns and its composites have been studied. The hybrid yarns have been prepared by the principle of friction spun method in a DREF-3 (Dr Ernst Fehrer A.G. the name of the inventor 1973) Machine. The system uses Kevlar-29 (poly paraphenylene terephthalamide) multifilament (KV M/F) and polypropylene (PP) of 38 mm staple length fibres as core and sheath materials, respectively. The tensile properties of selected reinforcing materials and hybrid yarns are tested before preparing the composite samples. The weight percentages of KV M/F were kept as 0%, 15%, 20%, 25% and 30% corresponding to the percentages of matrix. DREF-3 hybrid yarns are characterized by very homogeneous component distributed over the yarn cross-section. The hybrid yarn is used for thermoplastic composites in compression molding, where Kevlar multifilaments take place in core as reinforcing materials and sheath or wrapped PP fibres as matrix. The prepared composite samples have been studied using specific standards to evaluate the void volume fraction and the tensile behavior in the standard conditions. The composite having 30% of Kevlar shows the highest tensile strength with a high void percentage, however, the elongation to break is a minimum due to lower weight percentage of low elastic modulus polypropylene matrix as compare to other samples.

scholarly journals Development of Thermoplastic Composites for Visible Parts in Automotive

2017 ◽  
Vol 742 ◽  
pp. 62-69
Author(s):  
Thomas Köhler ◽  
Klaus Vonberg ◽  
Benjamin Mohr ◽  
Thomas Gries ◽  
Gunnar Seide
Keyword(s):  
Melt Spinning ◽  
Large Scale ◽  
Thermoplastic Composites ◽  
Vehicle Body ◽  
Production Cycle ◽  
Body Parts ◽  
Process Chain ◽  
Cycle Times ◽  
Whole Process ◽  
Hybrid Yarn

In order to reduce CO2 emissions, for the automotive industry, the most promising area of research is lightweight construction. Next to weight reduction, lightweight materials like fiber reinforced thermoplastic composites (FRTC) may also improve mechanical properties of vehicle body parts. FRTCs, so-called organic sheets, have the potential for large scale series production and they can be back moulded due to the thermoplastic matrix. On the other hand high production cycle times and a poor surface quality are limiting their potential. Therefore, ITA’s current research approaches these problems in two ways. Nanomodified materials and a new tool concept for heat pressing are going hand in hand and may lead to the technology’s breakthrough.To reduce the cycle times of the production of FRTCs innovative and modified matrix systems are investigated. The goal of the public founded project “VarioOrgano” is to analyze the potential of these modified yarns and the tool system during the FRTC production. Moreover, the capability of these composites in visible parts in automotive applications is investigated. Therefore, the whole process chain from compounding, to melt spinning, commingling and consolidation with a heat press is investigated.This paper shows the production steps along the process chain to produce these FRTCs with focus on hybrid yarn development and production.

Recent developments in the processing of waste carbon fibre for thermoplastic composites – A review

2019 ◽  
Vol 54 (14) ◽  
pp. 1925-1944 ◽  
Author(s):  
Muhammad Furqan Khurshid ◽  
Martin Hengstermann ◽  
Mir Mohammad Badrul Hasan ◽  
Anwar Abdkader ◽  
Chokri Cherif
Keyword(s):  
Carbon Fibre ◽  
Volume Fraction ◽  
Fibre Volume Fraction ◽  
Fibre Volume ◽  
Thermoplastic Composites ◽  
Hybrid Yarn ◽  
Quality Aspects ◽  
Structural Applications ◽  
Recent Developments ◽  
Reinforced Thermoplastics

The aim of this paper is to highlight recent developments in the processing of waste carbon fibre for thermoplastic composites. Initially, injection moulding and nonwoven technologies have been used to integrate waste carbon fibres into fibre-reinforced thermoplastic composites. Recently, tape and hybrid yarn spinning technologies have been developed to produce tape and hybrid yarn structures from waste carbon fibre, which are then used to manufacture recycled carbon fibre-reinforced thermoplastics with much higher efficiency. The hybrid yarn spinning technologies enable the development of various fibrous structures with higher fibre orientation, compactness and fibre volume fraction. Therefore, thermoplastic composites manufactured from hybrid yarns possess a good potential for use in load-bearing structural applications. In this paper, a comprehensive review on novel and existing technologies employed for the processing of waste carbon fibre in addition to different quality aspects of waste carbon fibre is presented.

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