The Study Of The Candidate Smart Composite Materials Of The Morphing Wing

Wing morphing can significantly improve the performance of future aircraft by adapting thewing shape to the specific flight regime requirements, but also represents a challenging problem:the structure has to be stiff to maintain its shape under loads and yet be flexible to deform withoutcollapse. One solution is to adopt structural elements made of smart composite materials; ShapeMemory Alloy (SMA) has demonstrated their suitability for many static applications due to theirhigh structural integration potential and remarkable actuation capabilities.The first part of this thesis, comprise of overview and classification of smart compositematerials, including their properties and ability. Moreover, the properties of shape memory alloy(SMA) and analysis of its stress-strain by using constitutive equation of SMA is discussed. TheSMA behavior is modeled using a dedicated routine to evaluate the internal stress state and theminimum activation temperature. A theoretical model for the bending of a laminated beam bondedwith shape memory alloy (SMA) fiber reinforced layer is presented. The constitutive relations ofthe SMA layers are obtained by using the method of micromechanics. The bending of the laminatedbeam is then discussed, and the relationship between bending moment, curvature and temperatureare provided. The governing relationships obtained in this paper can be used for theoreticalpredications of thermo mechanical properties of beam-like SMA actuators. The main discussion ofthe thesis will be written as below:1. The introduction of morphing wing, including its structure, advantage and disadvantage ofusing morphing wing. Furthermore, introduction of smart composite materials and theirclassification. The stabilization of material by using SMA, the analysis of the case of using SMA inmorphing wing will be discussed along with the applications and examples.2. Fundamental characteristics of Shape memory alloy, including the principle of SMA andthe properties of SMA.3. The numerical analysis of SMA by using constitutive equation, the stress-strain of SMAwill be discussed and the bending of laminated beam with SMA fiber will be analyzed.4. The experimental section consists of stress-strain and deflection of a laminated beam withSMA fiber embedded layer. The conclusion of SMA and the future of SMA will be discussed.