›› 2008, Vol. 29 ›› Issue (5): 1329-1333.

• Fundamental Theroy and Experimental Research • Previous Articles     Next Articles

Digital image measurement method of measuring triaxial specimen deformation based on sub-pixel accurate corner locator

SHAO Long-tan1, DONG Jian-jun1, 3, LIU Yong-lu2, SUN Yi-zhen1   

  1. 1. State Key Laboratory of Structural Analysis for Industrial Equipment, Department of Engineering Mechanics, Dalian University of Technology, Dalian 116024, China; 2. School of Physics and Optoelectronic Technology, Dalian University of Technology, Dalian 116024, China; 3. School of Civil Engineering and Mechanics, Yanshan University, Qinhuangdao 066004, China
  • Received:2006-07-19 Online:2008-05-10 Published:2013-07-24

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Abstract: As a digital image measurement method, the sub-pixel accurate location of a corner can be found in digital image by sub-pixel accurate corner locator. The purpose of this paper is to introduce digital image measurement method for measuring triaxial specimen deformation based on sub-pixel accurate corner locator. The distortion target of high precision is used to analyze the precision of the method. The results show that both axial and radial measurement precisions achieve 0.02 pixel and the magnitudes of relative measurement precision achieve 10-4. The high precision distance transducer and sub-pixel accurate corner locator method are simultaneity used to measure the small deformation of dry-specimen in triaxial compression test; and the accuracy and reliability of the method are proved.

Key words: digital image measurement, sub-pixel accurate, corner locator, triaxial test, strain

CLC Number: 

  • TU 411
  • Please send e-mail to pingzhou3@126.com if you would like to read full paper in English for free. Parts of our published papers have English translations.
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