DIMENSIONAL OR MECHANICAL CHANGES DUE TO SURFACE PREPARATION

For most materials, strain measurement results are usually not significantly changed by the surface preparation procedures that are recommended by Micro Measurements . Even with appreciable material removal, except for very thin parts, effects on the static mechanical properties of the test part are generally negligible compared to other error sources in the experiment. It should be understood, however, that removal of a plated or hardened surface layer, or of a surface layer with significant residual stresses, may noticeably affect the fatigue life or the wear characteristics of the part when operated under dynamic service conditions.