Astronautics Space Flight

Adaptive, tolerant and efficient composite structures by Martin Wiedemann, Michael Sinapius

By Martin Wiedemann, Michael Sinapius

Composite constructions are most productive in functionality and creation rate whilst mixed with clever fabrics making them adaptable to altering operational stipulations.
The particular construction procedures of composites provide the prospect to combine extra capabilities hence making the constitution extra helpful. lively services may be learned through shrewdpermanent fabrics, e.g. morphing, energetic vibration keep an eye on, energetic constitution acoustic keep watch over or constitution future health tracking. the basis is a legitimate realizing of fabrics, layout tools, layout ideas, construction applied sciences and adaptronics. alongside the entire procedure chain this disciplines jointly convey complicated light-weight suggestions for functions starting from mechanical engineering to automobiles, airframe and eventually house constructions.
This publication presents the clinical foundations in addition to inspiring new principles for engineers operating within the box of composite light-weight structures.

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Due to their design these piezocomposites are characterized by a high damage tolerance and a mechanical pre-compression of the brittle piezoceramic material. It is also possible to realize very complex configurations that can be adapted in shape and material composition to meet the requirements of different application scenarios. 3 Piezocomposite Transducers for Adaptive Structures 45 Fig. 16 Piezocomposite with integrated acceleration sensor State of the art d33-piezocomposites incorporate surface mounted interdigitated electrodes.

This is very interesting for circular or curved structures where hexagonal or curved patches are most suitable. 9 demonstrates the possibilities to manufacture customized patches. The separated pieces were cut into shape by laser and embedded into an array to form a complex piezocomposite. Besides piezoceramic plates it was also demonstrated that the manufacturing concept is applicable to fiber based piezocomposites as shown in Fig. 10. 4 Multilayer Piezocomposites In many applications it is required to significantly reduce the operation voltage of piezoelectric actuators without reducing the active strain.

2. 34 P. 1 Overview of state of the art low profile piezocomposites Name Type Cross section Description QuickPack d33 d31 FlexPatch d31 DuraAct d31 PowerAct d33 Active fiber d33 composite (AFC) Macro fiber d33 d31 composite (MFC) Piezoceramic tubes d31 Thin fibers d33 A monolithic piezoceramic plate with uniform surface electrodes bonded between polyimide films with etched circuit paths to contact the electrodes. To operate in the d33-mode a bare plate is bonded between polyimide films with etched Interdigitated electrodes [3, 4] A monolithic plate with surface electrodes glued between a polyimide films by melting the film up to 325°C.

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