Details
| Original language | English |
|---|---|
| Title of host publication | METAL Conference Proeedings |
| Pages | 380-385 |
| Number of pages | 6 |
| Volume | 2023-May |
| Edition | May |
| ISBN (electronic) | 978-80-88365-12-9 |
| Publication status | Published - 8 Jan 2024 |
Publication series
| Name | METAL - International Conference on Metallurgy and Materials, Conference Proceedings |
|---|
Abstract
Manufacturers like Airbus have strict specifications concerning the process sequence of fuselage shell forming. Coating may only take place after forming, because conventional processes induce large deformation which could cause coating failure. A novel incremental bending process known as Deharde Polygon Forming® (DPF®), has the potential to challenge existing process sequence restrictions due to lower deformations. Thus, it is to be investigated if precoated sheets can be formed by DPF® with regard to the coating properties. Correspondingly, in the scope of this work, starting from the initial state of coated EN AW - 2024 - T351, the changes of the Seevenax-313-81 coating after preloading were analysed. Therefore, three different strain states were induced by Marciniak tests and scaled fuselage shells were produced by DPF® from which specimen were obtained. Afterwards, the evolution of coating properties such as hardness, Young's modulus, elastic and plastic behaviour and friction coefficient were investigated by scratch and indentation tests with a Triboindenter TI 950. In parallel, the formed specimens were analysed for coating failure by using integrated optics. It was found, that the pre-stretched specimens by Marciniak tests and scaled DPF® do not undergo significant changes in the application characteristics of the coating. However, the former was found to have cracks in the coating. In contrast, for scaled DPF® fuselage shells, where compressive stresses are induced by contact with the tool or spring steel package, no failure were detected in the surface of the coating. The results indicate potential for flexibilization of the process chain regarding forming and coating.
Keywords
- Coating properties, fuselage shells, incremental bending, Marciniak tests, nanoindentation
ASJC Scopus subject areas
- Engineering(all)
- Mechanics of Materials
- Materials Science(all)
- Metals and Alloys
- Materials Science(all)
- Surfaces, Coatings and Films
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METAL Conference Proeedings. Vol. 2023-May May. ed. 2024. p. 380-385 (METAL - International Conference on Metallurgy and Materials, Conference Proceedings).
Research output: Chapter in book/report/conference proceeding › Conference contribution › Research › peer review
}
TY - GEN
T1 - Influence of Deformation on the Coating Properties of aircraft fuselage shells
AU - Jepkens, Jan
AU - Heimes, Norman
AU - Wester, Hendrik
AU - Müller, Philipp
AU - Hübner, Sven
AU - Wehrmann, Simon
AU - Müller, Matthias
AU - Behrens, Bernd-Arno
PY - 2024/1/8
Y1 - 2024/1/8
N2 - Manufacturers like Airbus have strict specifications concerning the process sequence of fuselage shell forming. Coating may only take place after forming, because conventional processes induce large deformation which could cause coating failure. A novel incremental bending process known as Deharde Polygon Forming® (DPF®), has the potential to challenge existing process sequence restrictions due to lower deformations. Thus, it is to be investigated if precoated sheets can be formed by DPF® with regard to the coating properties. Correspondingly, in the scope of this work, starting from the initial state of coated EN AW - 2024 - T351, the changes of the Seevenax-313-81 coating after preloading were analysed. Therefore, three different strain states were induced by Marciniak tests and scaled fuselage shells were produced by DPF® from which specimen were obtained. Afterwards, the evolution of coating properties such as hardness, Young's modulus, elastic and plastic behaviour and friction coefficient were investigated by scratch and indentation tests with a Triboindenter TI 950. In parallel, the formed specimens were analysed for coating failure by using integrated optics. It was found, that the pre-stretched specimens by Marciniak tests and scaled DPF® do not undergo significant changes in the application characteristics of the coating. However, the former was found to have cracks in the coating. In contrast, for scaled DPF® fuselage shells, where compressive stresses are induced by contact with the tool or spring steel package, no failure were detected in the surface of the coating. The results indicate potential for flexibilization of the process chain regarding forming and coating.
AB - Manufacturers like Airbus have strict specifications concerning the process sequence of fuselage shell forming. Coating may only take place after forming, because conventional processes induce large deformation which could cause coating failure. A novel incremental bending process known as Deharde Polygon Forming® (DPF®), has the potential to challenge existing process sequence restrictions due to lower deformations. Thus, it is to be investigated if precoated sheets can be formed by DPF® with regard to the coating properties. Correspondingly, in the scope of this work, starting from the initial state of coated EN AW - 2024 - T351, the changes of the Seevenax-313-81 coating after preloading were analysed. Therefore, three different strain states were induced by Marciniak tests and scaled fuselage shells were produced by DPF® from which specimen were obtained. Afterwards, the evolution of coating properties such as hardness, Young's modulus, elastic and plastic behaviour and friction coefficient were investigated by scratch and indentation tests with a Triboindenter TI 950. In parallel, the formed specimens were analysed for coating failure by using integrated optics. It was found, that the pre-stretched specimens by Marciniak tests and scaled DPF® do not undergo significant changes in the application characteristics of the coating. However, the former was found to have cracks in the coating. In contrast, for scaled DPF® fuselage shells, where compressive stresses are induced by contact with the tool or spring steel package, no failure were detected in the surface of the coating. The results indicate potential for flexibilization of the process chain regarding forming and coating.
KW - Coating properties
KW - fuselage shells
KW - incremental bending
KW - Marciniak tests
KW - nanoindentation
UR - http://www.scopus.com/inward/record.url?scp=105003730543&partnerID=8YFLogxK
U2 - 10.37904/metal.2023.4659
DO - 10.37904/metal.2023.4659
M3 - Conference contribution
VL - 2023-May
T3 - METAL - International Conference on Metallurgy and Materials, Conference Proceedings
SP - 380
EP - 385
BT - METAL Conference Proeedings
ER -