作者：晏志鹏1, 邓足斌2
作者单位：1. 中航电测仪器股份有限公司, 陕西 汉中 723000;
2. 沈阳仪器仪表研究院, 辽宁 沈阳 110043
关键词：等弯矩梁;高温;应变计参数标定;应变标准发生装置;高温灵敏系数;蠕变;漂移
摘要：
通过理论分析，分别从加载摩擦力、试验梁尺寸变化和温度变化着手，进行误差计算，四点式简支等弯梁标准应变的不确定度达到18.63%，严重影响应变计性能的标定精度，不符合电阻应变计国家标准和OIML国际R No.62号建议要求。通过对比分析，高精度SK-1A钢架梁结构可以将误差降低，实现标准应变相对误差仅0.054%，高温下也只有1.2%，有效解决应变计标定精度，实际测试结果也进一步验证该结论。
Influence of strain gages calibration accuracy with four-point simple supported curved beam device
YAN Zhipeng1, DENG Zubin2
1. Zhonghang Electronic Measuring Instruments Co., Ltd., Hanzhong 723000, China;
2. Shenyang Institute of Instrumentation Technology, Shenyang 110043, China
Abstract: Through theoretical analysis, starting from the loading friction force, the change of the test beam size and the temperature change, the error calculation is carried out. The uncertainty to the standard strain of four-point simple supported iso-curved beam reaches 18.63%. It seriously affects the calibration accuracy of strain gage and does not meet the national standard of resistance strain gage and OIML international R No.62. Through contrastive analysis, the high-precision SK-1A steel frame beam structure can achieve the standard strain relative error of 0.054% and the accuracy of 1.2% at high temperature, which can effectively solve the calibration accuracy of strain gage. The actual test results also verify that conclusion.
Keywords: equal bending moment beam;high-temperature;calibration of strain gage parameters;strain standard generating device;high-temperature gage factor;creep;drift
2019, 45(10):101-108 收稿日期: 2019-01-03;收到修改稿日期: 2019-03-11
基金项目:
作者简介: 晏志鹏(1974-),男,陕西汉中市人,高级工程师,主要从事应变电测技术和传感器研究
参考文献
[1] 尹福炎. 瞬态加热条件下高温应变计测量误差的修成方法[J]. 强度与环境, 2005(1):32-36
[2] 王文瑞, 张佳明, 聂帅. 高温应变接触式测量精度影响因素研究[J]. 固体火箭技术, 2015, 38(3):439-444
[3] 邓足斌, 郑振洲. 高精度钢架梁式SK-1应变计参数测定装置的结构和精度评定[J]. 仪表技术与传感器, 2001(1):38-41.
[4] 王文瑞, 张佳明, 闫晓强, 等. 高温应变片关键参数标定方法[J]. 工程科学学报, 2015, 37(12):1645-1650
[5] 邓足斌. 应变计灵敏系数测定装置中标定梁的优化设计[J]. 仪表技术与传感器, 1998(1):11-14, 1998(2):11-13
[6] 邓足斌. SK-1应变计灵敏系数测定装置的方案及主要机构的选择[J]. 传感器技术, 1987(1):56-61
[7] 叶迎西, 孙天贺, 艾延延. 温度对电阻应变片测量精度影响的仿真研究[J]. 沈阳航空航天大学学报, 2013, 30(2):27-30
[8] RECHARDS W L. A new correction techniques for strain gauge measurements acquired in transient-temperature environments[R], 1996.
[9] MA L C, WU T T,ZHAO L B. Development of tempera-ture compensated resistance strain gages for use to 800℃[C]//In proceedings of the international conference on experimental mechanics, 1985.
[10] 邓足斌. 电阻应变计灵敏系数Ki及其应变值εi计算公式的分析[J]. 传感器技术, 1986(1):49-54
[11] 邓足斌. 纯弯矩梁型应变计灵敏系数测定装置的误差分析和精度评定方法[J]. 传感器技术, 1999(7):10-12
[12] 金属粘贴式电阻应变计:GB/T13992-2010[S]. 北京:中国质检出版社, 2010.
