Vibration of buckled sandwich beam with self-deployable SMA core and heat treated SMA reinforced hybrid composite faces

Abstract

Shape memory effect is the key factor in the design of self-reconfigurable core using origami. Effects of heat treatment on transformation temperatures and stress-strain curve of shape memory alloys using differential scanning calorimetry and tensile testing is presented. Moreover, vibration of pre/post-buckled sandwich beam with self-deployable shape memory alloy (SMA) core and SMA wires reinforced hybrid composite faces is investigated. The Boyd and Lagoudas SMA constitutive model is utilized in ABAQUS UMAT subroutine. Extensive numerical studies presented for pre-strain, volume fraction, location, time and temperature of heat treatment depends on the properties of SMA fibers, along with core and hybrid composite temperature dependency. As can be seen from results, vibration behaviors, thermal stability and total thickness of self-foldable sandwich structure can be efficiently controlled by adjusting the values of SMA wires volume fraction, pre-strain and core type, respectively. Mechanical properties of SMA are decreased, as a result of increase in heat treatment time and temperature. Increasing heat treatment temperature leads to lower transformation temperatures of SMA. In contrast, higher transformation temperatures are the results of increasing heat treatment time.

Keywords:

• Differential scanning calorimetry
• hybrid composite
• origami
• self-deployable core
• shape memory alloys
• thermal buckling