Three-dimensional digital image correlation system for deformation measurement in experimental mechanics

Zheng-Zong Tang; Jin Liang; Zhen-Zhong Xiao; Cheng Guo; Hao Hu

doi:10.1117/1.3491204

1 October 2010 Three-dimensional digital image correlation system for deformation measurement in experimental mechanics

Zheng-Zong Tang, Jin Liang, Zhen-Zhong Xiao, Cheng Guo, Hao Hu

Author Affiliations +

Optical Engineering, Vol. 49, Issue 10, 103601 (October 2010). https://doi.org/10.1117/1.3491204

Abstract

A three-dimensional (3-D) digital image correlation system for deformation measurement in experimental mechanics has been developed. The key technologies applied in the system are discussed in detail, including stereo camera calibration, digital image correlation, 3-D reconstruction, and 3-D displacement/strain computation. A stereo camera self-calibration algorithm based on photogrammetry is proposed. In the algorithm, the interior and exterior orientation parameters of stereo cameras and the 3-D coordinates of calibration target points are estimated together, using the bundle adjustment technique, so the 3-D coordinates of calibration target points are not needed in advance to get a reliable camera calibration result. An efficient image correlation scheme with high precision is developed using the iterative least-squares nonlinear optimization algorithm, and a method based on a seed point is proposed to provide a reliable initial value for the nonlinear optimization. After the 3-D coordinates of the object points are calculated using the triangulation method, the 3-D displacement/strain field could then be obtained from them. After calibration, the system accuracy for static profile, displacement, and strain measurement is evaluated through a series of experiments. The experiment results confirm that the proposed system is accurate and reliable for deformation measurement in experimental mechanics.

©(2010) Society of Photo-Optical Instrumentation Engineers (SPIE)

Citation Download Citation

Zheng-Zong Tang, Jin Liang, Zhen-Zhong Xiao, Cheng Guo, and Hao Hu "Three-dimensional digital image correlation system for deformation measurement in experimental mechanics," Optical Engineering 49(10), 103601 (1 October 2010). https://doi.org/10.1117/1.3491204

Published: 1 October 2010

ACCESS THE FULL ARTICLE

INSTITUTIONAL
Select your institution to access the SPIE Digital Library.

SELECT YOUR INSTITUTION

PERSONAL
Sign in with your SPIE account to access your personal subscriptions or to use specific features such as save to my library, sign up for alerts, save searches, etc.

PERSONAL SIGN IN

No SPIE Account? Create one

PURCHASE THIS CONTENT

SUBSCRIBE TO DIGITAL LIBRARY

50 downloads per 1-year subscription

Members: $195

Non-members: $335 ADD TO CART

25 downloads per 1 - year subscription

Members: $145

Non-members: $250 ADD TO CART

PURCHASE SINGLE ARTICLE

Includes PDF, HTML & Video, when available