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Hufenbach W.,TU Dresden | Langkamp A.,TU Dresden | Hornig A.,TU Dresden | Zscheyge M.,TU Dresden | Bochynek R.,Leichtbau Zentrum Sachsen GmbH LZS
Composite Structures

The presented work focuses on the examination of the 3D shear damage behaviour and its phenomenological failure process of a thermoplastic composite made of E-glass/polypropylene hybrid yarn with a woven reinforcement. Experimental shear characterisation is performed by means of the Iosipescu testing approach for both in-plane and through-thickness directions. A procedure for the manufacturing of through-thickness shear specimens is presented in this study. The characterisation of the chronological failure process and deformation analysis is supported by high speed camera system and Digital Image Correlation. Based on the experimental observations, material modelling strategies are derived and performed within the finite element environment Ls-Dyna. © 2011 Elsevier Ltd. Source

Hufenbach W.A.,TU Dresden | Stelmakh A.,National Aviation University | Kunze K.,TU Dresden | Bohm R.,TU Dresden | Kupfer R.,Leichtbau Zentrum Sachsen GmbH LZS
Tribology International

Fibre reinforced polypropylene (PP) composites are frequently used for structural applications. In this context, it is of particular importance how much the tribological properties of PP can be improved by fibre reinforcement. Based on experimental investigations, this issue is discussed in the article by studying the tribo-mechanical properties of different PP composites. The relevant parameters of friction and wear are presented in order to provide a comprehensive data set for applications. Additionally, the wear mechanisms are studied phenomenologically by means of optical microscopy. It was shown that the tribo-mechanical properties of PP can be significantly influenced with a suitable reinforcement. © 2011 Elsevier Ltd. All rights reserved. Source

Gude M.,TU Dresden | Lenz F.,TU Dresden | Gruhl A.,TU Dresden | Witschel B.,Leichtbau Zentrum Sachsen GmbH LZS | And 2 more authors.
Science and Engineering of Composite Materials

The high specific strength and stiffness characteristics of composite materials such as carbon fiber-reinforced plastic (CFRP) allow a significant weight reduction of the structural machine components such as automobile driveshafts. But high material cost and rather low productivity of the established manufacturing processes (e.g., filament winding) often inhibit the use of CFRP components in a high-volume car series. In this paper, a novel composite driveshaft system based on a profiled CFRP tube is presented. This system is designed to be produced by a continuous pultrusion process to achieve a significant reduction of the manufacturing costs. A cost assessment study was conducted to quantify the benefit of the developed continuous manufacturing process. In comparison with the state-of-the-art filament winding process, a cost reduction of 36% for the composite shaft body can be obtained. Moreover, the proposed fiber layup processes - braiding and continuous winding - offer the potential to manipulate the reinforcement architecture to maximize material utilization without reducing the manufacturing efficiency. This potential is investigated and validated by experimental tests. A difference in the load bearing capacity of more than 100% between different reinforcing architectures is shown. © 2015 by De Gruyter 2015. Source

Hufenbach W.A.,Leichtbau Zentrum Sachsen GmbH LZS | Dannemann M.,Leichtbau Zentrum Sachsen GmbH LZS | Friebe S.,Leichtbau Zentrum Sachsen GmbH LZS | Kolbe F.,Leichtbau Zentrum Sachsen GmbH LZS | Tager O.,Volkswagen AG
42nd International Congress and Exposition on Noise Control Engineering 2013, INTER-NOISE 2013: Noise Control for Quality of Life

Composite materials offer for automotive applications the specific advantage of low constructive weight in combination with a high stiffness. For vibro- Acoustic applications, especially the low structural weight leads to higher vibration amplitudes due to low forces of inertia and causes undesired sound radiation. A useful approach to eliminate these drawbacks and increase the structural damping without adding too much additional weight to the construction is the integration of viscoelastic damping layers in the composite materials during the manufacturing process. In the presented experimental study, different types of viscoelastic Ethylene-Propylene-Dien-Monomer (EPDM) rubber sheets are integrated in the mid-plane of a reference laminate made from carbon textile-reinforced epoxy. The vibro- Acoustic properties of the fibre-reinforced multilayered composites - Absorption coefficient, sound reduction index, dynamic stiffness and material damping - were measured and compared. As expected, the integration of EPDM sheets in the composite leads to higher material loss factors. To identify the vibro- Acoustically optimal position of the EPDM layer within the composite lay-up special simulation methods suitable for composite materials have to be used. Copyright© (2013) by Austrian Noise Abatement Association (OAL). Source

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