Reduction of measurement uncertainties in dynamic material and structural component testing under periodic forces

In an investigation of means of reducing measurement uncertainties in dynamic testing with periodic forces, the exact relationship between the effective force acting on the test specimen and the force indicated by the force sensor in a fatigue testing unit is derived theoretically and experimentally. General vibration analysis shows that the difference between these two quantities can be effectively estimated by continuously measuring the effective force of acceleration between the specimen spring element and the force sensor spring element. The structural features of three different force sensors with regard to deformability are studied.