Examination of Accuracy of the Singular Stress Field Near a Crack-Tip by Digital Image Correlation |
| Journal |
Key Engineering Materials (Volumes 321 - 323) |
| Volume |
Advanced Nondestructive Evaluation I |
| Edited by |
Seung-Seok Lee, Joon Hyun Lee, Ik Keun Park, Sung-Jin Song, Man Yong Choi |
| Pages |
32-37 |
| DOI |
10.4028/www.scientific.net/KEM.321-323.32 |
| Online since |
October, 2006 |
| Authors |
Kenji Machida,
Yoshimasa Suzuki
|
| Keywords |
Digital Image Correlation, Newton-Raphson Method |
| Abstract |
Displacements obtained experimentally normally are including errors that make it
impossible to extract stresses strains with high accuracy using the raw displacement data. In the
infinitesimal deformation within the elastic region of a steel or an aluminum alloy, the quantity of
displacement is less than 1 pixel, and analysis accuracy deteriorates. We have developed a system
which employs the 2-D intelligent hybrid method and can analyze the displacement more exactly in
the sub-pixel field. By using the Newton-Raphson method in conjunction with 2nd order
deformation gradients, it is demonstrated that this method can accurately extract stress intensity
factors from a set of measured displacements. |
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