Abstract
This paper deals with the experimental and numerical characterization of a high damping CuAlMn sheet with a martensitic micro-structure at ambient temperature. A Cu-Al-Mn shape memory alloy containing 11.65 wt.% of Al and 3 wt.% of Mn, was cast and hot rolled to the thickness of 0.4–0.3 mm. Transformation temperatures, micro-structure and mechanical properties were studied. Effects of the heat treatment on damping were investigated, identifying the proper heat treatment to obtain a higher damping. Having to model the amplitude dependent damping of the material investigated, a material model was developed based of cyclic behavior under traction-compression load. The model was validated with experiments on the non-linear damping of the material.
Highlights
The industry’s demand for materials with a high damping capacity, ranging from the automotive to the aerospace and structural sectors, has led researchers and engineers to focus on the issue.Among the different materials available to achieve damping, the use of shape memory alloys (SMAs) has gained great relevance given their high damping levels due to their unique microstructures [1,2,3].The damping of SMAs can be associated to two different mechanisms: pseudo-elasticity and dissipation in the martensitic state
A very high martensite-austenite transformation temperature was observed, guaranteeing the martensitic phase at ambient temperature, and the transformation temperatures did not vary for samples with different heat treatments
A high dependency of the loss factor on the deformation amplitude was observed in all cases
Summary
The industry’s demand for materials with a high damping capacity, ranging from the automotive to the aerospace and structural sectors, has led researchers and engineers to focus on the issue. The scope of this study was to produce high damping thin sheets of SMA to be embedded in GFRP (glass fiber reinforced polymer) hybrid composite, as a passive strategy to control the vibrations of the composites’ structures. This hybridization concept has already been investigated by using martensitic Ni40 Ti50 Cu10 and Cu66 Zn24 Al10 as high damping materials [15]. The former is very expensive and the latter is not ductile enough to be laminated in thin sheets, as is required by the target application. The model developed was validated by experimental results and implemented in a user subroutine of the FE Abaqus code, to be used in a numerical simulation of the material behavior
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