RY61M SG hole-drilling rosette is five times more accurate

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 sometimes essential for manufacturers to determine the residual stresses in a component so that they its operational reliability can be assured.

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 strain gauge (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 easily connected, as the measuring grids are already connected on the carrier foil, or on a small PCB (printed circuit board).

Further information about the RY61M SG hole-drilling rosette can be found at www.hbm.com.