双引伸计式和应变计式同轴度测试仪的测量不确定度  

Measurement uncertainty of dual extensometer and strain gauge coaxiality testers

作　　者：尹思博 李政[1] 冯晟顺 YIN Sibo;LI Zheng;FENG Shengshun(Shanghai Institute of Quality Inspection and Technical Supervision,Shanghai 201114,China)

机构地区：[1]上海市质量监督检验技术研究院,上海201114

出　　处：《理化检验(物理分册)》2025年第4期37-42,共6页Physical Testing and Chemical Analysis(Part A:Physical Testing)

摘　　要：对双引伸计式和应变计式同轴度测试仪的测试原理进行分析,并对两种试验机的测量不确定度来源进行分析,研究了不同因素对两种试验机测量不确定度的影响程度。结果表明:采用双引伸计式同轴度测试仪时,应更关注引伸计的准确度、夹具对中情况,以及材料均匀性等因素;采用应变计式同轴度测试仪时,应额外考虑多截面贴片位置、数据采集系统线性误差,以及每次重新安装的定位偏差等因素;双引伸计式同轴度测试仪适用于常规的试验机同轴度日常检定;应变计式同轴度测试仪适用于精度要求高、分析全面的同轴度测试。The testing principles of dual extensometer and strain gauge coaxiality testers were analyzed,and the sources of measurement uncertainty for the two testing machines were analyzed.The degree of influence of different factors on the measurement uncertainty of the two testing machines were study.The results show that when using a dual extensometer coaxiality tester,more attention should be paid to factors such as the accuracy of the extensometer,the alignment of the fixture and the uniformity of the material.When using a strain gauge coaxiality tester,additional factors such as the position of the multi section patch,linear errors in the data acquisition system,and positioning deviations during each reinstallation should be considered.The dual extensometer coaxiality tester was suitable for routine coaxiality calibration of testing machines.The strain gauge coaxiality tester was suitable for coaxiality testing that required high accuracy and comprehensive analysis.

关 键 词：双引伸计式同轴度测试仪 应变计式同轴度测试仪 校准装置 测量不确定度 弯曲百分数 

分 类 号：TB30[一般工业技术—材料科学与工程] TG115.2[金属学及工艺—物理冶金]