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Deformation Analysis of a Brake Caliper Using NDT-Technologies

This paper describes the proceeding for the analysis of surface deformations of a brake caliper in a test bench by ESPI and structured-light 3D-scanning. In the field of nondestructive testing the optical measurement technique provides possibilities for the detection of small surface deformations. As a whole-field, contactless and coherent-optical testing and measuring technique the Electronic Speckle Pattern Interferometry (ESPI) meets those requirements. Irregularities on body surfaces can be detected up to a range that lies in the range of the used laser wavelength. The recording of the surface geometry is followed by the analysis of the surface deformation, which also is carried out by ESPI. Deformations are then pictured on the undeformed geometry as a color pattern. Independently from the ESPI, this report also displays the use of light-structured 3D-scanning for the acquisition of the surface geometry. With an affiliated CAD environment the geometry data can be transferred into a digital model. This data then is available as 3D-geometry for further processing. Adjacent a FE-calculation (finite element calculation) can be carried out for a computer-simulated load on the specimen. Besides a quantitative, numeral acquisition of deformation, also in this case a color pattern is generated over the object surface, which equals the numeral analysis. Thereby a comparison between the FE-calculation and the experimental measurement results gained by ESPI is enabled. Besides an explanation of the optical fundamentals, the setups of both recording methods and the measurement proceeding are introduced in the following. The results of both methods are compared to each other, differences of the measurement results of deformation values are discussed.

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