Measuring and testing – Specimen stress or strain – or testing by stress or strain... – By loading of specimen
Patent
1998-02-27
1999-12-28
Noori, Max
Measuring and testing
Specimen stress or strain, or testing by stress or strain...
By loading of specimen
73808, G01B 1600
Patent
active
060066083
ABSTRACT:
Described is a procedure for investigating the mechanical-dynamic properties of a work piece, whereby the work piece is subjected to cyclical tensile and/or compression stress in a first direction. A power signal representing the tensile and/or compression stress of a work piece is produced with the use of a power-registering device and produces a length change representing at least one specified section of the work piece my means of a distance-registering device. The power signal and distance signal are fed to an evaluation device, which determines a characteristic value for the mechanical-dynamic properties of the specified section from the power signal and distance signal obtained during one stress cycle. The procedure is distinguished by the fact that the work piece provided with a raster made of contrasting coding strips along a second direction is continuously swept by a laser beam with a specified scanning frequency along the second direction, and the intensity of the laser light modulated by the coding strips is registered. The time path of the distance signal corresponds to the registered intensity of the modulated laser light, and the evaluation device determines, from the time path of the distance signal, the length changes of different sections of the work piece defined by two or more coding strips and swept by the laser light and the characteristic values of these different sections for the mechanical-dynamic properties.
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Reese Olaf
Renz Rainer
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