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Piezokeramik-Metall-Verbunde: Produktionsmethode für smarte Sandwiches

Vortrag gehalten auf dem Wissenschaftlichen Symposium "Leichtbau durch Funktionsintegration", 27./28.03.2018, Chemnitz
Piezoceramic-metal-compounds: Production method for smart sandwiches
 
: Hensel, Sebastian; Nestler, Matthias; Drossel, Welf-Guntram

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Präsentation urn:nbn:de:0011-n-5070030 (23 MByte PDF)
MD5 Fingerprint: c5a3b4c21ad0cabb1aecd1ac753ceee0
Erstellt am: 31.8.2018


2018, 20 Folien
Wissenschaftliches Symposium "Leichtbau durch Funktionsintegration" <6, 2018, Chemnitz>
Englisch
Vortrag, Elektronische Publikation
Fraunhofer IWU ()
MFC; adhesive; curing; forming; piezoceramic-metal-compound

Abstract
Piezoelectric materials are often used in industrial applications. Typical examples are fuel injection or positioning systems. In contrast to this, the number of pieces with piezoceramic foil actuators is significantly lower. One reason is a lack of production technologies, able for high volume production. Especially the application of piezoceramic foil actuators on sheet metal parts is typically carried out with a lot of manual work under laboratory conditions.The authors propose a process chain for the automated integration of piezoceramic foil actuators in an aluminum based sandwich material. The smart sandwich consists of two aluminum sheets bonded with an adhesive. The piezoceramic foil actuator is placed inside the adhesive layer. The process chain allows an efficient automated fabrication of smart sandwiches able for forming. Formability is ensured by two different conditions of adhesive. The adhesive surrounding the piezomodule is in a liquid condition and allows for a relative movement between the piezomodule and the sheet metals during forming. Result is a significant reduction of forming induced strains in the brittle piezoceramic fibers. In the outer area of the smart sandwich the adhesive is cured and ensures the structural integrity of the compound material. Within the study only one adhesive is used enabling for relative movement of the piezomodule as well as ensuring the structural integrity of the compound by a local curing process. Therefore different temperatures were applied to the adhesive. Higher temperatures accelerate the curing for two component adhesives. For one component adhesives a specific temperature is required for curing. A test setup based on contact heating and local cooling was realized. Smart sandwiches with different adhesive curing conditions have been fabricated in an automated process chain. Finally the smart sandwiches were formed by deep drawing. The process limits according to the remaining functionality of the piezoceramic foil actuator were numerically and experimentally investigated. A correlation between allowed double-curvature and remaining functionality was found. Finally the potential of smart sandwiches for health-monitoring and noise reduction is shown exemplarily.

: http://publica.fraunhofer.de/dokumente/N-507003.html