Abstract
In the case of the NiTi alloy, some research works reported that the stress-strain curve differs significantly between tension and compression. It is considered that the difference in stress-induced martensitic transformation behavior may be observed under different loading modes in Fe-based shape memory alloy (Fe-SMA), which is less expensive compared with the widely-used NiTi alloy. In this study, both tensile and compressive tests of Fe-28Mn-6Si-5Cr shape memory alloy, which is one of Fe-SMA, are conducted under quasi-static and impact deformation at various strain rates. During deformation, it is attempted to evaluate the stress-induced martensitic transformation by measuring the volume resistivity as well as temperature for increasing a reliability of the alloy. Furthermore, from the results of volume resistivity at each strain rate, the strain rate sensitivity of stress-induced martensite under tensile and compressive tests is investigated. Additionally, the difference in stress-induced martensitic transformation under tension and compression is studied.
Highlights
In the previous study [1], the circuit based on the Kelvin double bridge with a higher precision is established to evaluate the change in the volume resistivity, which indirectly indicates the volume fraction of stress-induced martensite
Quasi-static and impact tensile tests using Fe-28Mn-6Si-5Cr shape memory alloy, which is a kind of Fe-based shape memory alloy (Fe-SMA) are conducted
In the present research work, both tensile and compressive tests of Fe-28Mn-6Si-5Cr shape memory alloy are conducted by two different testing apparatuses such as conventional material testing machine and impact testing machine based on the split Hopkinson pressure bar (SHPB) technique
Summary
In the previous study [1], the circuit based on the Kelvin double bridge with a higher precision is established to evaluate the change in the volume resistivity, which indirectly indicates the volume fraction of stress-induced martensite. In the case of other shape memory alloy such as NiTi, some research works reported that the stress-strain curve differs significantly between tension and compression [2,3]. It is necessary to evaluate the stress-induced martensitic transformation under such different loading modes as tension and compression at higher strain rate. In the present research work, both tensile and compressive tests of Fe-28Mn-6Si-5Cr shape memory alloy are conducted by two different testing apparatuses such as conventional material testing machine and impact testing machine based on the split Hopkinson pressure bar (SHPB) technique. From the results of volume resistivity at each strain rate, the strain rate sensitivity of stress-induced martensite under tensile and compressive tests is investigated. The difference in stress-induced martensitic transformation under tension and compression is studied
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