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Visualization of Buckling on Thin-walled Cylindrical Shell by Digital Image Correlation Method |
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PP: 999-1004 |
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Author(s) |
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C. Zhao,
H. Matsuda,
S. Lou,
C. Morita,
A. Koga,
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Abstract |
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| The problem of buckling stability is very important in thin-walled cylindrical shell structure. In order to investigate the
buckling phenomena, digital image correlation (DIC) method was applied in this experiment. The specimens have a thickness of
0.131mm and the ratio of external diameter (R0) to thickness (H) R0/H is 252. Due to its curved and thin walled elements, measurement
of displacement and strains by using the traditional methods is difficult, because there is not enough space for sticking necessary torsion
gauges to measure the out-of-plane behaviour, even if it is possible, the rigidity of the gauge itself will have an effect on the buckling
strength. However, by using the optical image correlation method, the problem is solved. DIC method is an optical instrument which
utilizes the full-field and non-contact measurement to gauge the three-dimensional displacement and strains on materials and structural
parts. In this paper three dimensional digital image correlation system is applied to observe the buckling generation process in details
and make a record of the surface displacement during the compression test by using two high resolution digital cameras, then the test
data are analyzed and compared by a special correlation technique which can determine the surface displacements of cylindrical shells
and it is shown in colour contour in full-field region. The buckling strengths obtained by the theoretical and experimental methods are
compared and discussed in this paper. The experimental study shows that the buckling strength of theoretical value is much higher than
that of experimental one, because the buckling strength is highly dependent on the imperfections. |
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