转子体连杆轴定载下最大应变不确定度的评定  

Evaluation on Uncertainty of Maximum Strain of Connecting Shaft of Rotor Body under Constant Load

作　　者：贾仕君 吴嘉杰[1] 刘杨[1] 巴发海[1] JIA Shijun;WU Jiajie;LIU Yang;BA Fahai(Shanghai Key Laboratory of Engineering Materials Application and Evaluation,Shanghai Research Institute of Materials,Shanghai 200437,China)

机构地区：[1]上海材料研究所上海市工程材料应用与评价重点实验室,上海200437

出　　处：《理化检验（物理分册）》2020年第5期27-30,共4页Physical Testing and Chemical Analysis(Part A:Physical Testing)

摘　　要：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80kN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28με。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 80kN.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 28με.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.

关 键 词：转子体 连杆轴 不确定度 应变 力学性能 拉伸试验 

分 类 号：TM934[电气工程—电力电子与电力传动]