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Design, Construction and Validation of a Digitally Controlled Variable Bending Test Station for Thermoplastic CFRP-Specimens (Masterarbeit)

Sprenger, Carolin (2020) Design, Construction and Validation of a Digitally Controlled Variable Bending Test Station for Thermoplastic CFRP-Specimens (Masterarbeit). DLR-Interner Bericht. DLR-IB-BT-AU-2020-217. Master's. Hochschule Augsburg. 148 S.

Full text not available from this repository.

Abstract

Replacing structural components in an aircraft with a lighter and more efficient material, like carbon fibre reinforced plastic, is becoming increasingly important in the aerospace industry. Especially thermoplastic matrices are more and more popular due to their possibility to be reheated and reshaped. One of these redesigned parts, with a thermoplastic matrix, are aircraft mounting brackets. Their production process is nowadays simplified by heating the brackets entirely and reshaping them into the desired form. Before using thermoplastics, these brackets were produced with a thermoset matrix which production methods were complex, required a huge variety of different shaping tools and were therefore in conjunction with high manufacturing costs. This master thesis will deal with an attempt to not entirely but locally heat and reshape thermoplastic mounting bracket blanks to avoid any complex press tool. Therefore, a variable and digitally controlled three and four-point-bending test machine is, at first designed, then constructed and finally validated. The experimental validation of the tests show that all different tests are working apart from a slight problem with the load cell. Temperature influence is creating a significant fluctuation in the load cells values and final deformation forces have to be examined with care. The objective is to locally heat a mounting bracket blank, where a certain angle is desired, to then form it into shape with the given three-point-bending fixture. The following four-point-bending test serves as a validation of the reshaped bracket quality, to track any loss of mechanical properties in the created aircraft mounting bracket.

Item URL in elib:https://elib.dlr.de/139371/
Document Type:Monograph (DLR-Interner Bericht, Master's)
Title:Design, Construction and Validation of a Digitally Controlled Variable Bending Test Station for Thermoplastic CFRP-Specimens (Masterarbeit)
Authors:
AuthorsInstitution or Email of AuthorsAuthor's ORCID iD
Sprenger, Carolinmatthias.beyrle (at) dlr.deUNSPECIFIED
Date:31 March 2020
Refereed publication:Yes
Open Access:No
Gold Open Access:No
In SCOPUS:No
In ISI Web of Science:No
Number of Pages:148
Status:Published
Keywords:Thermoplast, three-point-bending test
Institution:Hochschule Augsburg
Department:Faculty of Mechanical and Process Engineering
HGF - Research field:Aeronautics, Space and Transport
HGF - Program:Aeronautics
HGF - Program Themes:fixed-wing aircraft
DLR - Research area:Aeronautics
DLR - Program:L AR - Aircraft Research
DLR - Research theme (Project):L - Structures and Materials (old)
Location: Augsburg
Institutes and Institutions:Institute of Structures and Design > Automation and Production Technology
Deposited By: Beyrle, Matthias
Deposited On:11 Jan 2021 14:38
Last Modified:11 Jan 2021 14:38

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