Abstract：According to the requirements of ISO 1143 Metallic materials - Rotating bar bending fatigue testing and GB/T 4337 Metallic materials - Fatigue testing - Rotating bar bending method for strain calibration of rotating bar bending fatigue testing machines, a strain measurement evaluation method for rotating bar bending fatigue testing machine was proposed. The metal specimens with resistance strain gauges were used for loading tests. The test data were recorded through a strain collection system to measure the bending moment, and the evaluation program was established. The arrangement of resistance strain gauges formed a full bridge structure, which improved the sensitivity of measurement. Three different sizes of strain specimens were used to conduct loading tests on two different types of rotating bar bending fatigue testing machines and the test results could meet the requirements of the standard. Finally, the evaluation of uncertainty and the study of strain method traceability methods were conducted. The experiment proved that this method could measure the bending moment quickly, conveniently and accurately, and the practicality was high.
2023, Vol. 41 
