Pilot Tests to Determine Micro-Elastic Effects in Load Cell Receptor Materials

Abstract

The FFA precision equipment for symmetrical beam bending and deflection measurement was used on one single beam for two purposes. First, the methods for determination of the strain-temperature relationship within a narrow interval around room temperature were investigated. High accuracy was achieved; the total errors are of the order of ± 10 ppm. Next, the methods for determination of the degree of non-linearity for bending stress-strain curves in the “elastic” region, both at small stresses on both sides of the zero and at normal working stresses, were studied. The accuracy was less good in the latter case; at present the total not compensated errors are of the order of ± 50 ppm. This, however, can be brought down to about ±10 - 20 ppm with additional, known means.