Process for producing the research of cracks, and test piece for the implementation of the process

摘要

Process for producing the research of cracks, and test piece for the implementation of the process. / p & & p & the surface of a measurement location on the test piece, or the like, is pretreated and the sample is then subjected to a load, the location of the measurement being irradiated by a device for lighting, photograph by a device for taking and reproduced on a larger scale on a screen. In order to obtain this result, the surface 2 of the housing 5 or the mesureest covered, after a mechanical treatment of a thin layer 3 of a transparent lacquer which cracks in the same time as the test piece 1, and while applying a load, the housing 5 or the measurement is irradiated by a device for lighting 4 according to an angle of incidencea of the application according to which it is possible to obtain a total reflection on the layer of varnish 3.