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1

Influence of drill bit material on the bearing strength of holes in GFRP composite

Galińska Anna

Archive of Mechanical Engineering

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2023

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LXX, nr 2

287--310

EN

The article aims at assessing the influence of the drill bit material on the bearing strength of holes made in glass fabric reinforced epoxy composite. Six twists made of widely used drill materials such as high speed steels and carbides in different configurations were selected to drill holes in the composite. In the first stage of the work, optimum drilling parameters were selected and then used for drilling holes in specimens tested in single lap shear experiments. For each tested specimen two different delamination factors, one based on the delamination area and another - on its diameter, were calculated in order to assess the quality of the holes and then compared to the results of the bearing strength experiments. The results of the bearing tests showed that the highest strength was achieved for the high speed steel drill with titanium coating while the lowest for the cemented carbide drill. This finding is in opposition to the majority of results reported in literature.

2

FEM numerical simulation of contact stresses between driving shaft and hub impeller of fuel pump

Wiater M., Chladek G., Żmudzki J.

Journal of Achievements in Materials and Manufacturing Engineering

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2022

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Vol. 113, nr 1

13--21

EN

Purpose: The aim of the work was to test the contact stresses in the model system of the turbine hub cooperating with the fuel pump drive shaft. The hypothesis of the work was that, by means of FEA, it is possible to assess the contact stresses in the materials of the turbine hub and the fuel pump shaft during torque transmission. Design/methodology/approach: A turbine with fibre-reinforced polyphenylene sulphide (PPS) composite cooperating with a stainless steel shaft (X46Cr13/1.4034) in a commonly used D-flat shape joint was selected for the experimental research. To assess contact stresses, the CAD model (NX, Siemens) of the entire turbine was limited to the hub area. The drive shaft is supported in accordance with the bearing in the fuel pump, and the possibility of rotation about the axis along the length of the torque-producing magnet is taken away. The system was loaded with a torque of 200 Nmm on the turbine. The turbine hub and shaft were calculated, taking into account the phenomenon of contact detachment or slip at the value of the friction coefficient of 0.1. Findings: The pressure transmission area was found in the area at the edge of the flat surface D-flat and on the opposite side of the D-convexity. The contact stresses on the D-flat side reached values close to the composite strength. Research limitations/implications: The studies did not take into account the technological inaccuracies, thermal deformation, local material properties, and wear. The value of the friction coefficient was not measured in realistic conditions with fuel lubrication. Practical implications: FEA has been achieved, which allows to reduce the cost of experimental research. Originality/value: The proposed model allows for further studies of the influence of elasticity of various materials and structures on contact stresses in order to assess wear resistance.

3

Modelling of Textile Composite Adapted for Roof Structure

Radaszewska E., Benda A., Korycki R.

Fibres & Textiles in Eastern Europe

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2018

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Vol. 26, no. 5 (131)

99--103

EN

3D structural components made of fibrous composite materials subjected to service loading are analysed. The laminate consists of a matrix reinforced with a ply of long and unidirectional fibres. Participation of the fibres and matrix can vary in each layer. The main goal is to create a composite roof plate transferring variable loads of wet snow or fir and to investigate its strength properties in respect of (i) the type of fibres and matrix, and (ii) the volume fraction of the matrix and fibres within each layer. Modelling of shape and mechanical properties is reduced to the final phase of structural design, omitting time-consuming, expensive experimental tests. The numerical procedure is solved using the ADINA environment and finite element method code.

PL

Analizie poddano trójwymiarowe składniki konstrukcji wykonane z włóknistych materiałów kompozytowych, poddane obciążeniu eksploatacyjnemu. Laminat składał się z wypełnienia wzmocnionego przez warstwę długich włókien jednokierunkowych. Udział włókien i wypełnienia może być zmienny w każdej z warstw. Głównym celem było utworzenie kompozytowej płyty dachowej, która przenosi zmienne obciążenie mokrego śniegiem lub firnu i zbadanie jej własności wytrzymałościowych z uwagi na (i) typ włókien i wypełnienia, (ii) procentowy udział wypełnienia i włókien w każdej warstwie. Modelowanie kształtu i własności mechanicznych jest zredukowane do końcowej fazy projektowania konstrukcji i pomija czasochłonne, kosztowne badania eksperymentalne. Przykłady numeryczne zostały rozwiązane z wykorzystaniem środowiska ADINA i kodu metody elementów skończonych.

4

Modelowanie właściwości mechanicznych wyrobów lotniczych wytworzonych z kompozytów wzmocnionych włóknami

Chatys R., Piernik K.

Przetwórstwo Tworzyw

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2015

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T. 21, Nr 6 (168)

440-445

PL

W pracy omówiono i podjęto próbę szacowania właściwości mechanicznych próbek wyciętych z włóknistego materiału kompozytowego o osnowie poliestrowej (Firestop 8175-w-1). W modelu założono, że kompozyt składa się z komponentów, mających indywidualne fizykomechaniczne właściwości. Weryfikację poprawnego doboru kształtu próbki przeprowadzono metodą analizy elementów skończonych ABAQUS, wprowadzając do programu średnie wartości z próbek ciętych pod różnymi kątami względem wzmocnienia (mato tkanina szklana typu E).

EN

At the work they discussed and an attempt was made to estimate the mechanical properties of samples cut from a fibrous composite material with a polyester matrix (Firestop 8175-w-l). The model assumes that the composite comprises component having individual physico-mechanical properties. Verifications proper selection of the shape of the sample was performed by ABAQUS finite element analysis, a program that introduces the mean values of the samples cut at different angles to gain (the mato glass fabric of type E).

5

Textile preforms for dental applications

Poornim A., Giridev V. R., Balaji V. R.

Autex Research Journal

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2007

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Vol. 7, no. 2

130--147

EN

Dentistry has advanced to the use of FRCs, which helps patients to live their lifetime with their dentition intact. A large number of developments in the field of fibrous composite implants and devices for orthopaedic and dental applications have taken place. The present paper discusses the applications of fibre- and textile-reinforced composites in dental practices, mainly focussing on periodontal splinting. The conventional methods of splinting and the design & use of fibre-reinforced composites as restoratives to stabilise and splint teeth have been discussed in detail. The current controversy of incorporating implants in patients requiring splinting is discussed in relation to the various fibres applied as reinforcement for the splinting material.