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Mechanical Properties of Shark-Skin Like Structured Surfaces for High-Temperature Applications

Schlieter, Antje and Pflumm, R and Shakverdova, I and Naraparaju, Ravisankar and Schulz, Uwe and Leyens, Christoph and Schütze, Michael and Reimers, W. (2016) Mechanical Properties of Shark-Skin Like Structured Surfaces for High-Temperature Applications. Advanced Engineering Materials, 18 (5), pp. 688-702. Wiley. doi: 10.10002/adem.201500416. ISSN 1438-1656.

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Structuring surfaces with so‐called riblet structures shows improvements in drag reduction in external turbulent fluid flows. This paper presents the result of collaboration between four research groups which focused on the transferability of the riblet approach to high temperature material systems. With respect to the application excellent mechanical properties and high temperature oxidation resistance of the riblets are necessary. Different strategies for riblet fabrication are presented. Applicable processes as halogenation, coatings fabrication and laser ablation followed by oxidation to process “tiny” riblets on relevant material systems for aero engines such as Ni‐based super‐alloys (IN718, PWA1483) or titanium aluminides (gamma‐TiAl e.g. TNMB1) are presented. Not only that the riblets were fabricated on 2 different substrates, they also have different compositions such as metallic, half and completely oxidised. The riblet morphology is characterized and principle studies of the mechanical stability outlined promising results. The focus lies on the riblet characterization, so that the maximum applied stress is substrate specific and limited by the complete failure of the structures (e.g. cracking and deviation from the initial dimensions). All tested riblets exhibit good bonding to the substrate (i.e. partial riblet flanking). Results of quasi cyclic four point bending tests and low cycle fatigue are discussed taking into account the differences between the riblet and the substrate composition.

Item URL in elib:https://elib.dlr.de/100183/
Document Type:Article
Title:Mechanical Properties of Shark-Skin Like Structured Surfaces for High-Temperature Applications
AuthorsInstitution or Email of AuthorsAuthor's ORCID iD
Schlieter, AntjeTU DresdenUNSPECIFIED
Shakverdova, ITU DresdenUNSPECIFIED
Naraparaju, Ravisankarravisankar.naraparaju (at) dlr.deUNSPECIFIED
Leyens, ChristophTU DresdenUNSPECIFIED
Schütze, MichaelDECHEMA, FrankfurtUNSPECIFIED
Reimers, W.Institute for Materials Science and Technology, Technical University, Berlin, GermanyUNSPECIFIED
Journal or Publication Title:Advanced Engineering Materials
Refereed publication:Yes
Open Access:No
Gold Open Access:No
In ISI Web of Science:Yes
DOI :10.10002/adem.201500416
Page Range:pp. 688-702
Keywords:Shark skin structures, riblets, Oxidation
HGF - Research field:Aeronautics, Space and Transport
HGF - Program:Aeronautics
HGF - Program Themes:propulsion systems
DLR - Research area:Aeronautics
DLR - Program:L ER - Engine Research
DLR - Research theme (Project):L - Turbine Technologies (old)
Location: Köln-Porz
Institutes and Institutions:Institute of Materials Research > High Temperature and Functional Coatings
Deposited By: Naraparaju, Dr Ravisankar
Deposited On:30 Nov 2015 12:56
Last Modified:10 Jan 2019 15:45

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