On-line evaluation of measurement results during the determination of residual stress using strain gages

The article illustrates an example of an industrial application for residual stress determination based on the ring-core method.

With experimental stress analysis using strain gages the stresses which are required must be computed from the measured strains. These computations may in certain cases be based on complex algorithms, rendering the evaluation particularly complicated and inconvenient.

However, the complexity of the evaluation recedes into the background with on-line computer-controlled digital measuring systems and appropriate Software, because all computations and evaluations are executed quickly and reliably by the instrument/computer combination of equipment.

The article illustrates an example of an industrial application for residual stress determination based on the ring-core method. The measurement object is a rotor disk for a steam turbine. The author highlights the simplicity of working with an on-line measurement System and HBM's BEAM Software, despite the complicated evaluation algorithm that is in-volved.