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Adaptive GFRP rotor blades and additive manufacturing of the molding tools

Ost Lucas, Seidlitz Holger, Kuke Felix, Yellur Manoja Rao, Krenz Jonas, Ulke-Winter Lars

Zarządzanie Przedsiębiorstwem

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2021

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Vol. 24, nr 1-2

15--18

EN

Small wind turbines are mostly designed for strong and medium wind regions, which are scaled by manufacturers based on similarity rules. However, the inland region represents a low wind region where the commercially available blades are not profitable. In this work, a rotor blade was designed for these wind conditions and further performance improvement of the turbine was generated by self-adaptive adjustment of the blades to the variable wind loads. This adaptation is achieved by a ply structure that exhibits bending-torsion coupling. The tooling for the production of the GFRP rotor blades was manufactured using a large-format 3D extrusion printer.

2

Effect of the Position of Defined Local Defect on the Mechanical Performance of Carbon-Fiber-Reinforced Plastics

Ashir Moniruddoza, Nocke Andreas, Cherif Chokri

Autex Research Journal

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2019

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Vol. 19, no. 1

74--79

EN

Considering their energy and resource efficiency, fiber-reinforced plastics (FRPs) have been displacing metals and metal alloys for lightweight constructions. During the semiautomated manufacturing process of FRPs, and in particular during the laying of reinforced fabric layers, foreign bodies are enclosed within them, which in turn reduce the mechanical performance of FRPs. The research project presented in this article investigated if the loss in mechanical properties, such as tensile, flexural, and impact strengths, depends on the position of defined local defects, polytetrafluorethylene (PTFE) in this case, in the thickness direction of FRPs. In order to achieve this aim, PTFE was placed in different layers of reinforcing fabric before infusion. Subsequently, the mechanical performance of the fabricated FRPs was tested and evaluated. On the basis of the experiment, it can be concluded that the loss in mechanical properties was maximal if PTFE was laid in the middle position of FRPs in the thickness direction.

3

Impregnation studies and mechanical characterization of cellular, natural, fiber-reinforced, composite structures

Geller S., Weissenborn O., Gude M., Czulak A.

Polimery

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2016

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T. 61, nr 2

125--132

EN

With the use of natural fibers as a substitute for synthetic reinforcements, a significant contribution towards advanced ecological and efficient lightweight structures can be made.Within this article, the polyurethane (PUR) spray coat method is used for the manufacture of natural fiber-reinforced composites based on the fiber materials linen and hemp. Both the investigation of the mechanical properties and the yarn impregnation, as a reference for the composite quality, are of major interest and help to evaluate the potential of these bio-based materials as a contribution towards advanced lightweight components.

PL

Kompozyty wzmocnione włóknami naturalnymi na bazie lnu i konopi wytwarzano metodą warstwowego natrysku poliuretanu (PUR). Zbadano proces impregnacji przędzy i właściwości mechaniczne otrzymanych kompozytów oraz oceniono możliwości zastosowania takich materiałów pochodzenia naturalnego w zaawansowanych lekkich elementach konstrukcyjnych.

4

Metal/Composite Hybrids for Lightweight Applications

Osiecki T., Gerstenberger C., Hackert A., Czech A., Nossol P., Łagoda T., Niesłony A., Kroll L.

Machine Dynamics Research

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2015

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Vol. 39, No. 4

117-123

EN

Increasing mechanical, economic and environmental requirements lead to multi material designs, wherein different classes of materials and manufacturing processes are merged to realize lightweight components with a high level of functional integration. Due to the good specific characteristics and its suitability for mass production, the use of continuous fiber reinforced thermoplastics in conjunction with isotropic materials, such as steel or aluminum, offers advantages for lightweight components. Therefore, the aim of the present article was the development of innovative hybrid laminates with low residual stresses, made of steel sheets/foils and thermoplastic carbon fiber reinforced polyamide 6. Mechanical properties were examined in three point bending tests to obtain the Young's modulus as well as the flexural stress and flexural strain of the novel material.

5

Źródła uszkodzeń i zniekształceń wytworów z tworzyw wzmocnionych włóknami

Krywult B.

Polimery

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2002

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T. 47, nr 1

48-53

PL

Naprężenia powstające w procesach kształtowania wytworów z tworzyw wzmocnionych włóknami (TWW) i stanowiące skutek zjawisk termomechanicznych towarzyszących takim procesom są główną przyczyną uszkodzeń strukturalnych oraz zniekształceń otrzymanych wytworów. Znajomość tych zjawisk termomechanicznych stanowi więc czynnik konieczny do analizy konstrukcji i obliczeń technologicznych. Przedstawiono podstawy teoretyczne zjawisk termomechanicznych, analizę możliwych przyczyn powstawania naprężeń technologicznych oraz przykłady obliczeń konstrukcyjnych z wykorzystaniem programów komputerowych.

EN

Process-induced thermomechanical stresses give rise to crack initiation, crack growth, and final failure. Fundamentals of thermomechanical phenomena are presented (eqns. 1-8); possible reasons for stresses are outlined and illustrative CAD calculations are presented (Figs. 3-6).