Hole-drilling rosettes – RY21, RY51, RY61, RY61K, RY61R, RY61S, VY61S, XY51

Integral Method

hole_drilling_rosettesRY21 – Hole-drilling rosette

Using RY21 and the associated drilling device, it is possible to determine the residual stresses accoring to the integral method. The result is the integral mean value of residual stresses over the entire drilling depth.

RY61 – Hole-drilling rosette

Using the very easy to handle RY61 and the associated drilling device, it is possible to determine the residual stresses accoring to the integral method. The result is the integral mean value of residual stresses over the entire drilling depth. As these strain gages are covered by a print plate, they can be used on flat or slightly curved surfaces only.

Ring Core Method

RY51 – Ring core rosette

The RY51 rosettes for residual stresses with unkown principal direction are specifically designed for the ring core method. This process enables high precision measurements to be taken and the residual stresses to be represented in relatino to the drilling depth. As these strain gages are covered by a print plate, they can be used on level or weakly curved surfaces only.

XY51: Ring core rosette

The X51 rosette for residual stresses with known principal direction is specifically designed for the ring core method. This process enabls high precision measurements to be taken and the residual stresses to be represented in relation to the drilling depth.

High Speed Drilling

RY61R / RY61K / RY61S / VY61S

The RY61R / RY61K / RY61S / VY61S rosette has been specially designed for the requirements of high speed drilling. This method uses a special drilling technology, with a speed of 300.000 revs./min. This prevents new residual stresses from arising due to processing. The resulting highly precise measurement values allow a very precise representation of the residual stresses in relation to the drilling depth.

RY61M

Due to its patented design, the RY61M symmetrical hole drilling rosette is optimally suited for use in experimental stress analysis based on the hole drilling method. It provides six measuring grids instead of the customary three. They are arranged around the drill hole, with each of the opposite strain gage pairs being interconnected so that their signals are averaged. This reduces the measurement error resulting from potential eccentricity of the drill hole by a factor of 5. The connection effort is similar to that of other hole drilling rosettes, as the measuring grids are already connected on the carrier foil, or a small PCB (printed circuit board).