Crack tip deformation measurement using single-element extended digital image correlation

Chen Jinlong; Zhang Xiaochuan; Zhan Nan

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Crack tip deformation measurement using single-element extended digital image correlation

Chen Jinlong 1 * #,Zhang Xiaochuan 2,Zhan Nan 1

1.Department of Mechanics, Tianjin University, Tianjin 300072

2. Tianjin Key Laboratory of Modern Engineering Mechanics, Tianjin 300072

*Correspondence author

#Submitted by

Subject:

Funding: National Natural Science Foundation of China （No.10772133, 11072172）, Specialized Research Fund for the Doctoral Program of Higher Education （No.20090032110006）

Opened online:25 December 2012

Accepted by: none

Citation: Chen Jinlong,Zhang Xiaochuan,Zhan Nan.Crack tip deformation measurement using single-element extended digital image correlation[OL]. [25 December 2012] http://en.paper.edu.cn/en_releasepaper/content/4505660

Since the crack tip displacement field influences the crack paths under both fatigue and fracture conditions strongly, it is very important to develop a test method with high accuracy to measure this deformation parameter. Single-element extended digital image correlation (X-DIC) using the enrichment function to describe the crack tip singularity, which could measure the discontinuous deformation directly. Simulated images are used to verify the performance of single-element X-DIC, the measured crack tip displacement field is in accordance with the given value. Displacement fields of the compact tension specimen under pure mode I loading condition was measured. The influence to the measurement accuracy caused by the crack width，subset size and subset location was discussed. All results in this paper show that single-element X-DIC could be used to measure the crack tip displacement field with high accuracy.

Keywords:Experimental solid mechanics; crack tip deformation; extended digital image correlation (X-DIC); subset

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