Digital image correlation based high-speed crack tip locatingmethod and its application 被引量：1

Digital image correlation based high-speed crack tip locatingmethod and its application

下载PDF

导出

摘要 Based on a digital image correlation（DIC）method with the measurements of a high speed crack＇s displacement and strain fields,a technique to accurately and automatically locate its crack tip has been developed.The crack tip is identified by finding the abrupt jump on the opening（or dislocation）curve of a point on the trace of the crack propagation,while the opening is measured through a virtual extensometer technique and the abrupt jump is identified by finding the peak on the curve.The method was verified using a specially designed experiment and applied to measure the critical crack tip opening angle of a rock sample.Because the involvement of analytical models has been avoided and then the good performance could be ensured for low resolution speckle images,this technique is expected to be very useful in the quantitative study of high speed cracks in experiments using high speed cameras. Based on a digital image correlation（DIC）method with the measurements of a high speed crack＇s displacement and strain fields,a technique to accurately and automatically locate its crack tip has been developed.The crack tip is identified by finding the abrupt jump on the opening（or dislocation）curve of a point on the trace of the crack propagation,while the opening is measured through a virtual extensometer technique and the abrupt jump is identified by finding the peak on the curve.The method was verified using a specially designed experiment and applied to measure the critical crack tip opening angle of a rock sample.Because the involvement of analytical models has been avoided and then the good performance could be ensured for low resolution speckle images,this technique is expected to be very useful in the quantitative study of high speed cracks in experiments using high speed cameras.

作者曹彦彦马沁巍郭文婧

机构地区 School of Aerospace Engineering State Key Laboratory of Earthquake Dynamics Beijing Institute of Strength and Environment Engineering

出处《Journal of Beijing Institute of Technology》 EI CAS 2016年第1期7-16,共10页 北京理工大学学报（英文版）

基金 Supported by the National Natural Science Foundation of China(11172039,11402023) the Fundamental Research Funding of BIT(20120142021) the State Key Laboratory of Earthquake Dynamics(LED2011B03)

关键词 digital image correlation（DIC） high speed crack crack tip virtual extensometer crack tip opening angle digital image correlation（DIC） high speed crack crack tip virtual extensometer crack tip opening angle

分类号 O346.1 [理学—固体力学]

引文网络
相关文献

参考文献16

1Sutton M A. Digital image correlation for shape and deformation measurements [ M ] // Springer Hand- book of Experimental Solid Mechanics, 2008 : 565 - 598.
2Roux S, Rthor[J, Hild F. Digital image correla- tion and fracture: an advanced technique for estima- ting stress intensity factors of 2D and 3D cracks [ J]. Journal of Physics D: Applied Physics, 2009, 42: 214004.
3Chao Y J, Luo P F, Kalthoff J F. An experimental study of the deformation fields around a propagating crack tip [J ]. Experimental Mechanics, 1998, 38 (2) : 79 -85.
4Guo L P, Sun W, He X Y, et al. Application of DSCM in prediction of potential fatigue crack path on concrete surface [ J ]. Engineering Fracture Me- chanics, 2008, 75(3-4): 643-651.
5Ma S P, Wang L G, Jin G C. Damage evolution in- spection of rock using digital speckle correlation method ( DSCM ) [J ]. Key Engineering Materials, 2006, 326 -328 : 1007 - 1120.
6Francois H, Stphane R. Measuring stress intensity factors with a camera: integrated digital image cor- relation ([JDIC)[J]. Comptes Rendus M$canique, 2006, 334(1): 8-12.
7Samarasinghe S, Kulasiri D. Stress intensity factor of wood from crack-tip displacement fields obtained from digital image processing [ J]. Silva Fennica, 2004, 38 (3) : 267 - 278.
8Zhang R, He L F. Measurement of mixed-mode stress intensity factors using digital image correla- tion method[J]. Optics and Lasers in Engineering, 2012, 50(7) : 1001 -1007.
9Zanganeh M, Lopez-Crespom P, Tai Y H, et al. Lo- cating the crack tip using displacement field data: a comparative study[J]. Strain, 2013, 49(2) : 102 - 115.
10Lee D, Tippur H, Kirugulige M, et al. Experimen- tal study of dynamic crack growth in unidirectional graphite/epoxy composites using digital image cor- relation method and high-speed photography [J ]. Journal of Composite Materials, 2009, 43 (19): 2081 -2108.