Nonlinear digital-image correlation method and its application in finite deformation measurement

Hong-Wei Ji; Yuwen Qin; Hua Lu

doi:10.1117/12.468873

29 May 2002 Nonlinear digital-image correlation method and its application in finite deformation measurement

Hong-Wei Ji, Yuwen Qin, Hua Lu

Proceedings Volume 4537, Third International Conference on Experimental Mechanics; (2002) https://doi.org/10.1117/12.468873
Event: Third International Conference on Experimental Mechanics, 2002, Beijing, China

Abstract

The traditional theory about the digital-image correlation method (DICM) is modified, and a nonlinear displacement model is proposed and developed. On the basis of the displacement mode, both the Jacobian Vector and the Hessian matrix of the Newton- Raphson iterative method for estimating the approximate values of displacements and their gradients are given. The computer software for the nonlinear DICM is developed. In this paper, a rubber specimen stretched is employed, and the strain components at an arbitrary point of interest are computed using the nonlinear DICM. The experimental results show that the research work lays foundations for improving the accuracy of measuring finite deformation using DICM.

Citation Download Citation

Hong-Wei Ji, Yuwen Qin, and Hua Lu "Nonlinear digital-image correlation method and its application in finite deformation measurement", Proc. SPIE 4537, Third International Conference on Experimental Mechanics, (29 May 2002); https://doi.org/10.1117/12.468873

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