目前关于金属结构件的力学测量结果不确定度评定的研究较少，而不确定度评定可评估结构件力学测量结果的可靠性。采用万能拉伸试验机对转子体连杆轴进行轴向加载，测量其载荷为80 kN时连杆轴的最大应变，并进行了测量影响因素分析和不确定度评定。结果表明：转子体连杆轴的应变测量结果的扩展不确定度为28 με。标准模拟应变量校准器给出的标准值、测量重复性、拉伸设备精度、应变片等级、导线电阻和环境温度对测量结果的准确性影响较大，其中拉伸设备精度和应变片等级的影响最大。

At present, there were few research on the evaluation of uncertainty of mechanical measurement results for metal structures, however the evaluation of uncertainty could evaluate the reliability of mechanical measurement results of structural members. The connecting shaft of rotor body was loaded by universal tensile testing machine on axial, and the maximum strain on connecting shaft was measured when the load was 80 kN. The influence factors of measurement and the evaluation of uncertainty were analyzed. The results show that the expanded uncertainty on strain measurement results of the connecting shaft of rotor body was 28 με. The standard value given by standard analog strain calibrator, measurement repeatability, accuracy of tensile equipment, strain gauge grade, conductor resistance and ambient temperature had great influence on the accuracy of measurement results, among which the accuracy of tensile equipment and strain gauge grade had the greatest influence.