Abstract
This article investigates the efficiency of hybridizing composites with thin layers of martensitic shape memory alloys for improvement of damping. The non-linear damping behaviour of martensitic shape memory alloys is simulated using a modified version of Masing’s rules. The model was implemented in a user subroutine of a finite element code, and validated by a numerical simulation of experimental hysteresis loops at different maximum strain amplitudes. The experimental free decay of hybridized glass fiber reinforced polymer beams was simulated using the finite element model, including the validated model of the investigated materials. The amplitude-dependent damping of the hybrid beams in free decay was reproduced successfully in the numerical analysis and it was proven that the hybridization technique is efficient for improvement of damping.
Highlights
IntroductionShape Memory Alloys (SMA) are being used extensively for different purposes in this decade and the research projects on them have a broad range, varying form metallurgical issues involved in their damping mechanisms to research which investigates the technologies for SMA joining [1,2]
Shape Memory Alloys (SMA) are being used extensively for different purposes in this decade and the research projects on them have a broad range, varying form metallurgical issues involved in their damping mechanisms to research which investigates the technologies for SMA joining [1,2].their application field ranges from hybridizing techniques in composite structures in order to customize specific material performances, to more advanced fields such as micro actuation systems.In many studies, they have been used for vibration control purposes by employing an active or a passive strategy [3,4,5,6].A comprehensive review on this issue is available in [7]
The damping of these materials was investigated through cyclic tensile tests which were performed on sheets sized 200 mm × 20 mm × 0.2 mm at room temperature and at a different maximum strain amplitude, with an MTS hydraulic machine equipped with a 5 kN load cell
Summary
Shape Memory Alloys (SMA) are being used extensively for different purposes in this decade and the research projects on them have a broad range, varying form metallurgical issues involved in their damping mechanisms to research which investigates the technologies for SMA joining [1,2] Their application field ranges from hybridizing techniques in composite structures in order to customize specific material performances, to more advanced fields such as micro actuation systems. Regardless of the different physical mechanisms involved, all real materials dissipate some level of energy, no matter how little, during cycling deformation Such effect is highly nonlinear and related to many factors such as temperature, frequency, strain, and strain rate, while the linear behaviour assumption has only a limited application. The validated model was used to simulate the free decay of SMA/GFRP hybrid beams
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