Full-field strain analysis after the forming process is based on the precise measurement of initially squared grid patterns. This means that the sheet metal has to be marked before forming. Marking has to fulfil the following requirements:
- perfect transfer of sheet metal strain to the grid
- high visibility and contrast of the grids after intense tool contact
- low impact on the tribological behaviour of the sheet metal
- high precision grids
Different stencils are available with grid spacing of 1 – 2.5 mm so that the appropriate marking can be applied for the corresponding forming process. The ViALUX marking sets cover the whole line of materials used in forming technology. In addition to the electrolytic marking equipment a new printing methodology was developed for practical use for non-conducting materials.