HBM Launches Patented Hole-Drilling Rosette

HBM, which offers products and services for measurement applications, has launched a patented hole-drilling rosette to increase the accuracy of residual stress measurement by a factor of five. In the hole-drilling method, which is one of the most common methods of determining residual stresses in components, strain gauges (SGs) determine the deformation - or relaxation strain - around a drill hole while it is being drilled.

Residual stresses are mechanical stresses that exist in a material without external forces or moments acting on the component. They can occur in metallic workpieces during production caused by, for example, uneven cooling during casting or by rolling. Residual stresses affect the component in the same way as load-induced stresses and can reduce its load-carrying capacity. It is essential for manufacturers to determine the residual stresses in any component to ensure operational reliability.

HBM's new RY61M SG hole-drilling rosette has a patented structure that utilises six measuring grids instead of the customary three to determine the eccentricity of the hole, which is a potential source of error. The hole-drilling rosette measuring grids are arranged around the drill hole, with each of the opposite SG pairs being interconnected so that their signals are averaged. The measurement error resulting from drill-hole eccentricity is reduced by a factor of five because HBM uses six measuring grids. The RY61M SG is said to be easily connected as the measuring grids are already connected on the carrier foil or on a small printed circuit board.

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