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Thermal images of a nitinol wire being stressed and subsequently relaxed.
Temperature and Stress curves as function of time for a NiTi wire with 3 mm diameter under tensile test. The wire temperature increases 25.5 °C spontaneously upon loading, and decreases −17 °C within about 10 s of loading/unloading.
The temperature change of NiTi wires with various diameters under tensile tests. The temperature changes were measured when the applied stress is removed. The fitting curve indicates the theoretical ΔTadiabatic of −20.8 °C.
Stress strain curves for two pieces of 3 mm diameter wires during the tension (178 cm long sample) and compression tests (1 cm long sample). The areas underneath the loading curve for tension and compression are about 29 and 25.6 MJ/m3, respectively; the areas enveloped by the loading/unloading curve are about 21.1 and 6.6 MJ/m3, respectively.
Comparison of different cooling technologies.
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