Trafag Ag

Tobias Ettenauer

Christoph Schanz

Dieter Zeisel

Philipp Cörlin

Tobias Senkbeil

Falk Von Seggern

In order to be able to carry out an accurate and simple contactless load measurement on test objects made from materials which are optimized with respect to the intended purpose thereof, the test object () and a load measuring apparatus for measuring a load on the test object, wherein the load measuring apparatus () has a magnetic field generating device () for generating a magnetic field in a measuring region () of the test object () and a first and a second magnetic field capturing device () for capturing a magnetic field parameter which changes on account of the load, characterized in that the measuring region () has a layer () made of a ferromagnetic amorphous or nanocrystalline metal alloy with maximum particle sizes of less than 1 μm.

Load measuring arrangement, method for producing said arrangement and load measuring method which can be carried out with said arrangement

For more accurate load measurement, a load measuring arrangement includes a test object and a load measuring device for measuring a load on the test object. The load measuring device includes at least one magnetic field detection device for detecting a magnetic field parameter changing due to load at a measuring zone of the test object. The test object is work-hardened, at least at the measuring zone and at least in a near-surface region extending from a surface facing the magnetic field detection device to a depth of 20 μm, in such a way that it has a dislocation density of at least 5e8/cmand/or a residual stress of at least 400 MPa in amount.

Load measuring arrangement for magnetostrictive measurement of a load on a test object as well as manufacturing method

To reduce a hysteresis error, the invention provides a load measurement method () for measuring a load in a test object (), comprising: a) generating a magnetic field in the test object () by means of at least one magnetic field generating coil (Lg) to which a periodically alternating current is applied; b) detecting a magnetic field parameter which changes on the basis of a load in the test object (), using at least one magnetic field detecting device, in order to generate a magnetic field parameter signal () which changes periodically according to the periodically generated magnetic field, characterized by: c) detecting the hysteresis-to-signal ratio of the magnetic field parameter signal () over time within one period; and d) disregarding magnetic field parameter signal values from at least one predetermined timespan within each period in which a maximum hysteresis-to-signal ratio occurs.

Method, device and arrangement for load measurement on a test object

To improve the output signal quality of a load measurement by means of active magnetization, the invention provides a load measurement method for measuring a mechanical load on a test object (), comprising: a) generating and applying a magnetic field to the test object (); b) detecting a magnetic field changed by the test object () as a result of a mechanical load on the test object () by means of a first magnetic field detection device () to generate a first measurement signal (U, UAB), c) detecting a magnetic field changed by the test object () as a result of a mechanical load on the test object () by means of a second magnetic field detection device () to generate a second measurement signal (U, UAB), d) computationally determining a third measurement signal (UBT) from the first measurement signal (U, UAB) and the second measurement signal (U, UAT), and preferably comprising the steps of e) forming a difference from one (U, UAT) of the first and the second measurement signals and the computationally determined third measurement signal (UBT) to produce an output signal, f) determining the mechanical load applied to the test object () based on the output signal. The invention also provides a corresponding load measurement device for carrying out the load measurement method.

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Stuttgart, Germany

Tobias Ettenauer