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张悦,潘兵,郭广平*,赵澎涛.接触式与非接触式引伸计应变和泊松比测量精度比较[J].实验力学,2018,33(1):59~68
接触式与非接触式引伸计应变和泊松比测量精度比较
Comparison of measurement precision of strain and Poisson's ratio using contact and non-contact extensometer
投稿时间: 2016-10-11  最后修改时间: 2016-11-24
DOI:10.7520/1001-4888-16-205
中文关键词:  数字图像相关  视频引伸计  应变  泊松比  不确定度
英文关键词:Digital Image Correlation(DIC)  video extensometer  strain  Poisson's ratio  uncertainty
基金项目:
作者单位
张悦 北京航空材料研究院材料检测与评价航空科技重点实验室航空材料检测与评价北京市重点实验室先进高温结构材料国防科技重点实验室 北京 100095 
潘兵 北京航空航天大学航空科学与工程学院 北京 100191 
郭广平* 北京航空材料研究院材料检测与评价航空科技重点实验室航空材料检测与评价北京市重点实验室先进高温结构材料国防科技重点实验室 北京 100095 
赵澎涛 北京航空材料研究院材料检测与评价航空科技重点实验室航空材料检测与评价北京市重点实验室先进高温结构材料国防科技重点实验室 北京 100095 
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中文摘要:
      接触式电子引伸计方法和非接触式视频引伸计方法是当前材料力学性能测试中应变测量的两种主要方法,其测量原理迥异,亦各具优缺点。本文对商业接触式电子引伸计和最新研制的基于数字图像相关方法(DIC)的先进视频引伸计的性能进行了系统比较,设计标准铝板试样单向拉伸实验定量比较了两种引伸计横纵应变与泊松比的测量结果。结果显示,两者测量纵向应变结果比较接近,接触式引伸计的精度略高,但两者的不确定度在相同的量级。考虑到视频引伸计使用便捷、适用测量对象和测量范围广泛的特点,因此应用前景更为广阔。
英文摘要:
      Contact type electronic extensometer and non-contact video extensometer are nowadays two major strain measurement techniques in material mechanical property measurement. Both extensometers have entirely different measurement principles and respective advantages and disadvantages. A systematic performance comparison between an advanced video extensometer which is newly developed based on digital image correlation (DIC) method and a commercial contact type electronic extensometer is presented in this paper. Standard aluminum plate sample uniaxial tensile experiment was designed and carried out to quantitatively compare the longitudinal and transverse strain and Poisson's ratio measurement results obtained by using two kinds of extensometers. Comparison results show that both measured longitudinal strain results are relatively close. Contact type extensometer has slightly better precision, but the uncertainty of two kinds of extensometer is at the same order of magnitude. Taking into account of the convenient use of video extensometer, applicable measurement objects and wide range of measurement, video extensometer has broader application prospect.
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