Nanoscale martensitic phase transformation of shape memory alloys in stability of hybrid laminated cylindrical shells

Body and cape of high-speed flight vehicles are exposed to aerodynamic heating so that reduces flight performance due to instability. Shape memory alloys (SMAs), mechanical interactions between martensitic transformation and grain boundaries at small scales play a critical role, which made them suitable for application in laminated structures. In this study, the axial buckling of hybrid laminated cylindrical shells reinforced with SMA fibers made of nanocrystalline Nitinol is studied. Properties of nanocrystalline Nitinol SMA fibers are determined using the Brinson's constitutive model. Governing equations are derived using classical shell theory with the Von-Karman type of geometrical non-linear in conjunction with Love's first approximate accompanied with the static mode of virtual displacement principle. To solve the governing equations generalized differential quadrature (GDQ) method are used in longitudinal direction. The effect of pre-strain and volume fraction of SMA fibers on the critical load of the cylindrical shells are investigated. Results show that shell reinforcement with small percentage of pre-strained SMA fibers significantly increases the critical load.

کلیدواژه ها:

Hybrid laminated composite cylindrical shells ، Shape memory alloys ، Brinson constitutive model