It is relatively easy to take measurements on metal test samples. Depending on the material, measurements on plastics and compounds are also possible on request. In addition, the latest generation of tried and tested EVAL software allows different mathematical algorithms to be compared and thus to find the calculation approach that best matches the respective application. This enables simplified approaches assuming that mechanical stress propagates uniformly through the borehole depth to be compared with approaches assuming non-uniform propagation per ASTM standard E837-13a. Depending on the test sample, the Schwarz-Kockelmann coefficients method might be better suited than the integral method according to Schajer. Three-dimensional views mapping principal stress and angle over the drilling depth facilitate data evaluation.
Moreover, our engineers use the latest generation of residual-stress strain gauges for quickly and reliably documenting measurement results. Besides strain gauges with three measuring grids, versions with six or eight grids are also available, for example, for compensating the effects of eccentricity (borehole centricity).
On completion of a residual stress measurement taken in our laboratories or on site at your premises, you receive a comprehensive test report where all measurement data is clearly presented.