FUTURE APPLICATIONS OF NI-TI ALLOYS IN AUTOMOTIVE SAFETY SYSTEMS

다국어 초록 (Multilingual Abstract)

The shape memory alloys present unusual thermo-mechanical properties. The most important of them arepseudo-elasticity and memory effect. The paper investigates this behaviour for the Ni-Ti wires under static (v < 50 mm/s) anddynamic conditions (v > 50 mm/s) at different temperatures. Ni-Ti actuator and pseudoelastic wires with diameter between0.1 mm to 0.5 mm are being tested. For dynamic investigation a new testing plant able to satisfy the testing conditions iscreated. This new testing plant is still under development and the reported results originate from the first tests on this newmachine. The new device is designed to reach speeds higher than 50 mm/s. These speeds can be achieved using a drop weightwhich will hit a bottom plate and by this the kinetic energy is transferred to the sample. Because the weight is dropped, thestroke for the sample is measured in two points. The force of this impact will be in-line measured and, if the sample will beelectrically activated during this test, it is also possible to log the electrical voltage. To widen the application range of the shapememory alloys it is necessary to study their behaviour in the dynamic region. With the new testing facility, it is expected totest the damping properties of SMA wires. In that case, these results can generate the basis for finding new applications forshape memory alloys especially in the automotive safety industry.

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