The fiber composites consist of the fiber in the form of a filament or staple fiber, e.g. as roving, and a matrix that provides the necessary bond strength.

The characteristics profile, in addition to the choice of fiber and matrix material, is largely determined by the orientation of the fibers in the textile fabric. For the requirements of testing technology, a distinction is usually made between unidirectional and multidirectional laminates.

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The test specimen set-up is mounted on a plate. The plate projects out of the test room and for this reason the door of the test room is cambered. The door of the test room is opened and closed pneumatically. Approx. 10 seconds is needed for opening and closing the door. A special mat is provided in front of the test chamber. As soon as the mat is stepped on to the door of the testchamber cannot be opened or closed.

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Temperature, pressure and humidity are the testing parameters.
A parameter is changed for every test. The other two parameters remain unchanged. First of all, every test is performed in a pure synthetic air atmosphere and then in an atmosphere containing a defined quantity of fuel gas. The aim of the test is to discover the effect that a changed parameter has on the signal emitted by the test specimen. Signals and parameters are logged (timedependent), graphically output and stored on data carriers. In addition, any special operating conditions are displayed and logged e.g. exceeding of a threshold value.

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Dust tests are mainly performed to test functioning of components under extreme environmental conditions. Various standards specify e.g. the test duration and the composition of dust used. The dust is filled in the funnel below the test space. The formation of dust within the test space is effected by compressed air injection through four special nozzles. The dust is blown and swirled in upper test space by intensive air movement.

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A large axial fan sucks the air out of the easy-to-clean test space made of stainless steel. In an air duct behind the rear test space wall, this circulating air then passes through the electrical heater (heating) and the fin-type heat exchanger (cooling). After passing the humidification bath (aerosol-free humidification/dehumidification) the circulating air re-enters the test space via special air baffle plates, ensuring optimum temperature and humidity constancies (in time).

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An aluminium plate is mounted on the inner side of the test room door. The test specimen set-up is mounted on this plate. The test specimen set-up comprises of the steering column, steering wheel and airbag. After the test specimen has been set-up, the total assembly is temperature conditioned i.e. heated or cooled. The temperature ranges from -70°C to +180°C. When the temperature conditioning process is completed, the door of the test room opens by 180°. The airbag is then triggered.

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One particular criterion is the behaviour of the sensors at varying heights. The pressure in the test space can be dynamically altered within the range of 1100 to 1 mbar to simulate this behaviour. The same applies to temperature and dewpoint temperature. A further parameter is radiation. The system is equipped with a radiation device which is located in front of the test space door. The rays are projected through a round observation window into the test space.

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Electronic components use for the space and aeronautics are tested under extreme climatic conditions.

It is not necessary to expose the specimen to a defined air humidity.

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The system comprises of three major assemblies: a test chamber, a flangemounted switch cabinet for the control elements and a separate switch cabinet for other electrical components.The refrigerating unit and other components are integrated in the test chamber. The temperature and pressure prevailing in the test chamber can be controlled. The temperature is set via a heat exchanger. The heating medium is a heat transfer medium. The pressure can be set from 750 to 1050 mbar. Pressure constancy is ± 2 mbar. Thus, pressure fluctuations – such as those that could actually occur – can be simulated.

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