[1]张 磊,李树刚,申 凯,等.基于数字图像的试样表面应力估算及应用[J].西安科技大学学报,2020,(02):229-237.
 ZHANG Lei,LI Shu-gang,SHEN Kai,et al.Estimation and application of sample surface stress based on digital image[J].Journal of Xi'an University of Science and Technology,2020,(02):229-237.
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基于数字图像的试样表面应力估算及应用(/HTML)
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西安科技大学学报[ISSN:1672-9315/CN:61-1434/N]

卷:
期数:
2020年02期
页码:
229-237
栏目:
出版日期:
2020-03-30

文章信息/Info

Title:
Estimation and application of sample surface stress based on digital image
文章编号:
1672-9315(2020)02-0229-09
作者:
张 磊1李树刚2申 凯3潘红宇2张天军24
(1.西安科技大学 能源学院,陕西 西安 710054; 2.西安科技大学 安全科学与工程学院,陕西 西安 710054; 3.中煤科工集团重庆研究院有限公司,重庆 400037; 4.西安科技大学 理学院,陕西 西安 710054)
Author(s):
ZHANG Lei1LI Shu-gang2SHEN Kai3PAN Hong-yu2ZHANG Tian-jun24
(1.College of Energy Engineering,Xi'an University of Science and Technology,Xi'an 710054,China; 2.College of Safety Science and Engineering,Xi'an University of Science and Technology,Xi'an 710054,China; 3.China Coal Technology and Engineering Group Chongqing Research Institute,Chongqing 400037,China; 4.College of Sciences,Xi'an University of Science and Technology,Xi'an 710054,China)
关键词:
应力估算 数字图像相关 表面应力 参数优选 应力演化
Keywords:
stress estimation digital image correlation surface stress parameter optimization stress evolution
分类号:
O 348.1
文献标志码:
A
摘要:
为获得试样破坏过程中的表面应力分布特征,提出了基于数字图像的试样表面应力估算方法。开展了含孔试样破坏的应力场演化观测试验,利用数字图像相关技术获得试样破坏过程中的图像序列,采用VIC-3D软件计算试样的表面变形场及应变场。结合所得应变场数据及应力估算方法,计算得到试样表面应力。采用虚拟场理论建立了表面应力与轴向应力的关系,且据此评估了3种弹性模量及5种泊松比的估算效果,优选了最佳应力估算参数组合。最后将应力估算方法应用于试样破坏过程中的应力场演化分析,对比验证了应力估算准确性。结果表明:弹性模量仅影响应力估算的峰值大小,不改变应力的分布,由数字图像计算得到的平均泊松比μ3在估算时稳定性较好; 采用平均弹性模量Eav以及平均泊松比μ3估算加载中期的应力较为准确; 估算所得表面应力能够完整的反应试样破坏过程,表面应力集中与裂纹萌生存在对应关系。数字图像相关方法的应力估算能够量化表面应力,研究可为实验力学中的表面应力分析提供参考。
Abstract:
In order to explore the surface stress distribution characteristics during the failure process of the specimen,a stress estimation method based on digital image correlation was proposed.An experiment of observing the stress field evolution of the hole-containing samples was carried out.The image sequence in the destruction process of the sample was obtained by digital image correlation technology.The surface deformation field and strain field of the sample were calculated by VIC-3D.Based on the obtained strain field data and the stress estimation method,the surface stress of the sample was calculated.The relationship between the surface stress and the axial stress was established by using the virtual field theory,and the estimation effects of 3 kinds of elastic modulus and 5 kinds of Poisson's ratio were evaluated,and the optimal stress estimation parameter combination was optimized.The stress estimation method was applied to the stress field evolution analysis during the sample failure process,thus verifying the accuracy of the stress estimation.The results show that the elastic modulus only affects the peak value of the stress estimation,without changing the stress distribution.The average Poisson's ratio obtained by DIC has better stability in the estimation.It is more accurate to estimate the stress in the middle of loading by the average elastic modulus Eav and the average Poisson's ratio μ3.The obtained surface stress by estimating can completely reveal the destroy degree of the sample,and the surface stress concentration corresponds to the crack initiation.The stress estimation of the digital image correlation method can quantify the surface stress,and the research can provide a reference for the surface stress analysis in experimental mechanics.

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备注/Memo

备注/Memo:
收稿日期:2019-10-18 责任编辑:杨泉林
基金项目:国家自然科学基金(51734007,51774234,51874234)
通信作者:张天军(1971-),男,陕西临潼人,教授,博士生导师,E-mail:tianjun_zhang@126.com
更新日期/Last Update: 2020-03-30