The use of adaptive working safety systems for automotive applications is continuously increasing. In modern automotive engineering, especially quick changing actuators are used in applications concerning safety regulations. Nowadays the actuators are mainly operated by complicated mechanical systems, very often by so-called pyrotechnic ignition devices. By using intelligent materials, e.g. shape memory alloys (SMA), an actuator function can be reached easily. Additionally, in comparison with systems driven by pyrotechnic ignition devices, with such systems it is possible to carry out the actuator function repeatedly, or also reversibly. But the use of SM materials in such safety systems is reduced because of the lack of material knowledge on this section. A central problem is the durability of the switching function (longtime stability of the shape memory effect, SME), which still has to be proved. An adaptive safety system with shape memory alloys for use in cars was developed from an industrial consortium called IPPS. In the presented research project from the HTWG Konstanz and ETO MAGNETIC special focus was given to the long-time stability of quick changing shape memory actuator elements in the application of a bonnet lifting system for pedestrian protection. In the first part the feasibility of NiTi wires as actuators in the bonnet lifting system is shown. In the second part the results of long-time stability tests on pre-strained NiTi wires are presented. It can be concluded, that the use of quick changing shape memory elements as actuators in safety systems should be possible not only for the bonnet lifting system, but also for other automotive applications.


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    Title :

    Long-time stability of quick changing shape memory actuators


    Additional title:

    Langzeitstabilität von Formgedächtnisaktuatoren bei schnellem Wechselbetrieb


    Contributors:


    Publication date :

    2006


    Size :

    4 Seiten, 7 Bilder, 6 Quellen



    Type of media :

    Conference paper


    Type of material :

    Print


    Language :

    English




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