期刊名称：International Journal of Computer Systems Science and Engineering
印刷版ISSN：1307-430X
出版年度：2007
卷号：03
期号：01
页码：1-1
出版社：World Academy of Science, Engineering and Technology
摘要：Displacement measurement was conducted on
compact normal and shear specimens made of acrylic homogeneous
material subjected to mixed-mode loading by digital image
correlation. The intelligent hybrid method proposed by Nishioka et
al. was applied to the stress-strain analysis near the crack tip. The
accuracy of stress-intensity factor at the free surface was discussed
from the viewpoint of both the experiment and 3-D finite element
analysis. The surface images before and after deformation were
taken by a CMOS camera, and we developed the system which
enabled the real time stress analysis based on digital image
correlation and inverse problem analysis. The great portion of
processing time of this system was spent on displacement analysis.
Then, we tried improvement in speed of this portion. In the case of
cracked body, it is also possible to evaluate fracture mechanics
parameters such as the J integral, the strain energy release rate, and
the stress-intensity factor of mixed-mode. The 9-points elliptic
paraboloid approximation could not analyze the displacement of
submicron order with high accuracy. The analysis accuracy of
displacement was improved considerably by introducing the
Newton-Raphson method in consideration of deformation of a
subset. The stress-intensity factor was evaluated with high accuracy
of less than 1% of the error.
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